Characters: Adventure Time Main

The Main Characters of Adventure Time

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    Finn the Human (or Finn Mertens) 
"I'll slay anything that's evil. That's my deal."

The intrepid human boy. Hyperactive with a love of adventure and good deeds. That thing on his head is actually a hat. Originally 12 years old, he gets older each year.

Voiced by: Zach Shada in the 2006 pilot, Jeremy Shada in the series

Finn the Human provides examples of the following Tropes:

  • Adorkable: Especially when crushing on Princess Bubblegum and later Flame Princess.
  • Amazon Chaser: He often gets starry eyed whenever Flame Princess is fighting someone.
  • An Arm and a Leg: In "Escape from the Citadel", Finn loses his right arm when he tries to tether himself to his father's star ship so that he won't escape from the Citadel. His grass blade mutates and envelops his arm, twisting it into a horrific mass of grassy mutated flesh, and the force of the ship flying out of the Citadel rips his grass arm off leaving him without an arm beneath the elbow. Some of the guardian's blood manages to get on his arm afterward. Sporting a flower on his stub though it seems it'll take time for the grass blade to recover.
    • In "Breezy," the arm comes back when the flower left by the grass sword turns into a tree over Finn's arm stub and leaves behind the arm covered in a waxy substance; this happens after Finn finally feels a warm, loving feeling after seeing a vision of Princess Bubblegum. Yeah, it's pretty weird.
  • Angst? What Angst?: Invoked. He hates the process of facing and treating traumatization, so he applies Brain Bleach or just suppresses his emotions outright. In fact, when confronted with disturbing experiences, he places them in the Vault.
    • Finn meets with a cloud spirit living in a drifting cloud who teaches Finn a lesson on this subject. The spirit tells Finn not to bottle up his feelings but to instead dwell on them, because that's the only way you'll ever comes to terms with those feelings. Finn eventually does learn his lesson at the end of the episode as he finally lets go of his anger.
      • Unfortunately, this doesn't mean that Finn is able to face the truama of everything that a seasoned veteran hero has faced, especially at his age.
      Jake: You just went through some outrageous beeswax with losing your favorite arm and etcetera. You can't just expect to bounce back to normal.
      Finn (genuinely surprised): I can't?
    • It Runs in the Family: His biological father always has a cheerful disposition, no matter what kind of stuff is blowing up around him.
  • Artificial Limbs: Alternate depictions of Finn always show his right arm to be a crude prosthetic, such as his dream of himself as an adult. Also applies in the Farmverse.
    • Even applies to his past life as Shoko.
    • Also his "lifetime" spent in the pillow universe. How the heck he lost an arm in a world made up entirely of pillows is anyone's guess.
    • Now that Finn has lost his right arm, his need for one is perfectly justified. In a recent episode we see Finn experiment with replacement arms that Princess Bubblegum made for him, which all annoy him because they don't handle anything like his old arm. Eventually the flower in his stub of an arm gives him an artificial arm made out of psychic, white glowing energy.
      • "Breezy" has the flower on Finn's arm grow into a large tree, which eventually bursts leaving behind a bit of a hollow log on his arm. When that's peeled off, a brand new, perfectly healed arm is revealed covered in sap.
  • Auto-Tune: He's able to switch this effect on and off for his actual singing voice after he swallows a tiny computer immediately prior to "The Jiggler".
  • Awesome Backpack: His big, green, circular backpack.
  • Badass
    • Badass Adorable: He skinned a polar bear for his hat as a baby. Do the math.
    • Badass Normal: When he's not borrowing wizard powers from talking tadpoles or summoning ice shurikens. He beat the Lich with a sweater. Albeit not at full strength.
    • Badass Abnormal: He eventually gains the ability to generate a psychic limb, giving him super powers.
    • Badass Decay: In-Universe. In the second half of Season 5. After his breakup with Flame Princess, he gets into a rut, he's more focused on wooing his old love interests.... when they want him doing heroic things instead. It's so bad, he gets overshadowed by Cinnamon Bun of all people (granted, Cinnamon Bun has Taken A Level In Badass.)
  • Berserk Button:
    • Unsurprisingly, he doesn't react well to Jake or Princess Bubblegum being threatened.
    • In "Evicted", Marceline kind of killed Jake for a minute. Finn's reaction was... not pretty.
    • In "To Cut a Woman's Hair", the witch merely uses Jake as a cushion (albeit in the context of Finn's requiring someone to be in "danger" in order to help her), and Finn charges.
    • Finn doesn't seem to take it well when someone even tries to come between his and Jake's friendship. Just ask Tiffany.
    • He freaked out when the Jiggler mother attacked her baby rather than take it back. Given that his first memory is being alone in the woods as a baby, it's understandable that he might have some issues with this.
      "Mamas are supposed to love babies! THEY'RE SUPPOSED TO LOVE BABIES!"
    • When Jake is transformed into a Lumpy Space guy.
    • When his picture frame of Bubblegum is set on fire after he spent hours crying over it, he snarls:
  • Beware the Nice Ones: As nice a guy as he is, it would be unwise to get on his bad side.
  • Blood Knight: He may be in it mostly to slay evil, but there's no denying that he really likes fighting for its own sake ("If you're an evil witch, I will punch you for FUN!") When he wins the Fight King's "favor," he really hams it up.
  • Bodyguard Crush: On Princess Bubblegum.
  • Book Dumb: See Idiot Hero.
  • British Teeth: Due to biting rocks and trees.
  • Broken Ace: Multiple times, but he always manages to pick himself back up.
  • Character Development: He's getting more aware when it comes to romance, and he's also getting less and less silly and more mature as the show goes on. More complex aspects of his personality are developed slowly, so he often comes off as a Static Character. The show has celebrated his 13th birthday in what is likely a case of Real Life Writes the Plot since Jeremy Shada's voice has noticeably deepened.
    • And to think, Finn used to be this kid:
      Jake: Looks like you're dealing with some new emotions that you don't understand... like jealousy.
      Finn: BLAAARGH!!
    • Compare Finn in "Go With Me" (where he's just starting to learn about the finer points of dating from Jake and he threw up watching two people kiss) to Finn in later episodes where he kisses girls on the lips without any qualms.
    • He has presumably finally learned his lesson in regards to the age difference between himself and Princess Bubblegum.
      • Especially since he now knows that she's centuries old as of "The Vault."
  • Characterization Marches On: Early episodes had him be the more wild Chaotic Good half of the main duo ("I'll slay anything that's evil, that's my deal."), before making him into The Paragon.
  • Chick Magnet: So far, lots of princesses want to give Finn a peck on the cheek.
    • Also he foolishly promised a pack of princesses that he'd get them married to whomever they wanted. Slime Princess wanted him (and was only the first one to speak up).
    • Kidanova: During "To Cut a Woman's Hair," every princess he talks to seems to think he's in love with them (except Princess Beautiful, fortunately). He eventually gets Princess Bubblegum to go to the forest and have dinner with him.
      "If there's one thing I learned today, it's that I'm awesome at talking to ladies."!
  • Chronic Hero Syndrome: In one episode, he displays this, the reason being when he was a baby, he was left alone in the forest and nobody came to help him. It's downplayed in general; he takes his hero work as a calling in life, but tries not to step on anyone's toes.
  • Collector of the Strange: In "The Jiggler" it's revealed he has a glass eye collection. It's never mentioned again.
  • Combat Sadomasochist: The kid jumped into a volcano for fun. You finish the math.
  • Compressed Hair: Hair that would probably go down to his feet, until he cut it off.
  • The Conscience: To counteract his other friends' occasional amoral tendencies.
    Jake: Look at all this grave booty! CHA-CHING!
    Finn: Jake! You LOOTED? That's bad, man!
    Jake: Oh... I didn't know it was wrong...
    Finn: (sigh) Come on, let's put all of this back.
    Jake: What?! All of it?!
    Finn: Yes, Jake.
  • Cool Sword:
    • His first one has a blade of gold. The second has an interesting, woody handle and an Absurdly Sharp Blade.
    • It doesn't get any cooler than a black hole sword in "The Real You".
    • From "Dad's Dungeon" to "Play Date", he gets a sword made out of a demon's blood.
    • From "Blade of Grass" to "Escape from Citadel", he gets a cursed blade made of grass that can cut through anything.
    • As of "Is That You?", he has the Finn Sword, a sword made from an alternate version of himself.
  • Crazy Jealous Guy: He gets extremely jealous when someone comes in the way of him and Princess Bubblegum or Jake or FP.
  • Creepy Child: From snuggling a piece of Princess Bubblegum's hair to watching Jake sleep and taking pictures, Finn can be a disturbing child at times.
  • Cursed with Awesome: The Grass Sword. It is literally cursed, and while it gives him exceptional swordsman skills, he can't remove it from his person. It tried to slowly take over his arm, but once he accepted that the sword would be a part of him forever, the sword retracted to form a bracer around his wrist. He can summon it at will.
    • In the Season 6 premiere the grass sword overtakes his arm once more, this time to help him, only this time he finally loses his arm. He regains the arm some episodes later but seems have lost the grass blade in the process.
  • Dating Catwoman: Flame Princess is quickly revealed to be evil. Finn develops a crush on her after she attacks him.
  • Defiant to the End: Showcased in "Escape from the Citadel" when The Lich reaches out his hand to finish him off. Finn defiantly smacks the hand away despite the fact that The Lich immobilized him with just a single word, and Finn had no guarantee that such a feeble attack would keep The Lich at bay.
  • Determinator: His very first appearance has an amusing double-subversion. Finn is told to believe in himself in order to escape his prison of ice; Finn refuses, but then breaks out through sheer willpower. In the series proper, he soldiers past numerous injuries, breaks out of the Lich's mind control, literally ignores two broken legs to save the day(s).
  • Did Not Get the Girl: Twice, he tried with Bubblegum after her age down but this was dashed when she had to restore her age to save the kingdom from Lemongrab and she's shown no interest in pursuing romance. Then came Flame Princess and that lasted for awhile, but she broke it off after the incident with Ice King and any hope of getting back together with her was crushed when Cinnamon Bun professed his love for her. And now...
  • Didn't Think This Through: The reason he lost Flame Princess.
  • Did You Just Punch Out Cthulhu?: He frequently goes there. For instance, in "Freak City" he, in a fit of rage, decides to beat up Life. In another episode he attacks a fourth-dimensional black-hole type construct, and destroys it. After he gets the cursed blade of grass he slays the Fear Feaster with it in "Billy's Bucket List". In "Escape from the Citadel", he takes down The Lich by gooping him with the blood of the fallen Guardian, which has massive amounts of healing properties, thus bringing the Lich to life into an innocent giant baby.
    • Has gone toe to toe with the Lich three or four times and has always managed to throw a wrench in the Lich's plans.
  • Disappeared Dad: His dad was being held in the Citadel. He doesn't care that Finn exists at all.
  • Distaff Counterpart: Fionna.
  • Easy Amnesia/Laser-Guided Amnesia: Finn can put frightening memories in his "vault". What's disturbing is that he does it so casually...
    Finn: That one's going in the vault. Aaaaaaand... it's gone.
    • Once Finn opens the vault just a crack, he's apparently easily able to discover his past lives.
  • Fatal Flaw: Lust seems to be this for Finn in later seasons. It is responsible for ruining his relationship with Flame Princess.
  • The First Cut Is the Deepest: Princess Bubblegum.
  • Foreshadowing: A lot of hints were dropped that Finn would lose his right arm starting with his Farmworld depiction. This eventually happens in the Season 6 opening.
  • For Great Justice: His reasoning for why he fights evil.
  • For Happiness: When he and Jake aren't busy fighting evil, they're just trying to have a good time.
  • Fetish: It's been firmly established that he gets off on violence. Not dealing with this very well is what destroys his relationship with Flame Princess.
  • Freudian Excuse: Inverted. Finn helps people because of a traumatic experience as a baby.
    • By extension this seems to have given him abandonment issues.
  • Genre Savvy: To the point of predicting every single part of the Fight King's trap after nothing more than a few lines from him in "Morituri Te Salutamus".
    • Was also smart enough to invoke Unspoken Plan Guarantee by not telling even Jake about his overall plan to trick the Fight King into giving him his Soul Jar so he could destroy it.
  • Given Name Reveal: In the "Farmworld", it turns out his Alternate Self has the full name "Finn Mertens". By "Dentist" he indicates he's learned the name and taken to using it himself, and "The Visitor" shows it is his father's surname in this timeline as well.
  • Gonk: His Alternate Self from Farmworld:
    Jake: Man, Alternate Wish-World Finn is mad uglies!
    • Since the primary difference in appearance is that Farm-Finn has eyes with sclera rather than just black dots and a visible nose (and a prosthetic arm, but that doesn't really hurt his appearance much), to some extent this may simply be a matter of moving him closer to human appearance and therefore deeper into the Uncanny Valley.
  • Growing Up Sucks: After his breaking up with Flame Princess Finn started to feel things became more complicated as he was growing up, wishing to have things be like they were before.
    • Note that every single romantic attachment of his has retired from dating him to spend more time leading her people (where he has none to lead).
    • The realization that his human father never loved him and never will, also left him very depressed.
  • Hair of Gold, Heart of Gold: Although his hair color was originally only Word of God, it's since been seen. And it is glorious. He has the associated purity.
  • Happily Adopted: By Jake's family.
  • The Heart: He's the only one who can get Bubblegum and Marceline to stick together; in 'What Was Missing', it's clear that their attempt to get through the Door Lord's door would have fallen apart fairly easily without his influence.
  • Heartbroken Badass: His love life hasn't exactly been kind to him. Being abandoned by his human dad, twice doesn't make things any easier either.
  • The Hero: In general, and by reputation. He's basically a freelance knight, with most of his work coming from the Candy Kingdom (due to proximity), though he and Jake also specialize in dealing with the Ice King.
  • Heroes Fight Barehanded: Despite owning at least two swords, Finn usually fights with his bare hands.
  • Heroes Prefer Swords: Though he uses Good Old Fisticuffs much more and an ax at least once.
  • Heroes Want Redheads: His crush on the Fiery Redhead Flame Princess. Original crush Princess Bubblegum is also a redhead, sort of, though hers is more fuchsia.
  • Heroic BSOD: He goes through a (hilariously brief) one every time somebody reminds him that he's almost certainly the last human.
    • Spends half of "Dad's Dungeon" like this because he thought Jake and Joshua turned against him. It's bad enough that he actually tries to eat the apples. Twice, the second time he's actually watching what the apples do to a person. Jake has to stop him both times.
    • In "Hot to the Touch," when he realizes he can neither fight or hurt his new crush the Flame Princess, nor allow her to destroy the goblin kingdom, he curls up and cries, right before briefly passing out.
    • The end of Escape from the Citadel leaves him with Prismo dead, his arm and sword gone and his dad abandoning him. He doesn't even try and swim to the surface of the lake he's in and Jake has to pull him out. He also spends The Tower singing a Madness Mantra about how he intends to tear off his father's arm to replace his.
  • Heroic Willpower: Goes hand-in-hand with his many Determinator feats.
  • He's Back: "Billy's Bucket List". Season five particularly deconstructed his heroism, with hormones taking precedent and making him act like a jerk, but in said episode he's determined to finish Billy's list and conquers his fear of the ocean. Though, with the revelation of his human father still being alive, more angst is sure to come.
  • Hidden Depths: Lightly hinted at a few times. In particular, he may hide a desire for civilized life, as well as trauma stemming from his Parental Abandonment. He rarely if ever dwells on such things.
    Finn: I... am complicated.
  • Hormone-Addled Teenager: His yearly aging leads to more complicated relationships with girls.
  • Hotblooded: From the "Hero Boy Named Finn" song:
    Finn: And I'm not gonna be cool... 'cause I'm pipin' ho-oooooot!
  • Hulking Out: Finn, when something happens to Jake. Then he's talked down by Jake and calms down.
  • I Am Not Weasel: Flame Princess comes to the conclusion that he must be a Water Elemental due to him crying each time she's seen him and him repeatedly hurting her without realizing it. Also, the squirrel from "Up a Tree" mistakes him for a chipmunk.
  • I Can Change My Beloved: After the Flame King explicitly explains that his daughter, like everyone else in his kingdom, is evil, Finn makes influencing her to good his goal. (It definitely helps that she's on board with it.)
  • An Ice Person: After putting on the Ice King's crown in the Farmworld universe.
  • Idiot Hero:
    Why is Finn missing so many teeth?
    He bites trees and rocks and stuff. He's stupid.
    • Which makes it that much more interesting when his brain works perfectly, like in "Morituri te Salutamus".
    • As shown in "The New Frontier", Finn occasionally forgets how the sun works, and is seemingly floored when Jake re-explains it to him.
    • In "In Your Footsteps", he freely gives away the Enchiridion, a "hero's handbook" he got dozens of episodes ago, because he's mostly used it for sitting on. It falls into the Lich's hands.
  • I Just Want to Be Loved: He's at that age when he's looking for a girlfriend. Unfortunately, after he screwed things up so bad with Flame Princess, he tends to turn into a total idiot when he's around girls he likes, which causes them not to be interested in him.
  • I'll Kill You!: A couple of times. See Berserk Button.
  • Important Haircut: To save Jake from eternity in a witch's butt. Since then he seems to be letting it grow out again.
  • Improbable Aiming Skills: With paper airplanes. Pity that he overestimates his own ability in this area.
  • Incorruptible Pure Pureness: To the extent that he tries to beat his purity into others. Even his just born sphinx clone was automatic good and did a Heroic Sacrifice to stop his evil "sister" Goliad.
    • The Lich uses this against him to open up a portal to the multiverse by a means Finn thought would prevent it.
  • Inter-Class Romance: His two love interests are princesses.
  • Interspecies Romance: So far he's crushed on a candy person (princess) and a girl made of flames. And in "Puhoy" he even married and had two children with a pillow-girl.
    • Of course, seeing as how there aren't very many pure-bred humans left on Earth, he doesn't have a lot of choice in avoiding this.
  • Jerkass Ball: In "Jake Suit" he doesn't care that Jake gets hurt when he wears him as armor and tells him to toughen up then at the end of the episode he wears the 'Jake Suit' and jumps down a volcano hurting Jake and himself (off course it's more of an example of him holding the Idiot Ball then). And more recent as of "Frost and Fire" and "Too Old", the former of which has him ruining his relationship with Flame Princess, and the latter lying to Jake in hopes of getting alone time with PB. (It doesn't work.)
    • FIRMLY grasps the Jerkass Ball in Frost and Fire to the point that Flame Princess breaks up with him.
  • Keet: Finn is hyperactive, joyful, and sometimes surprisingly tender-hearted, when he's not beating his enemies to a bloody pulp.
  • Kid Hero: 15 years old and growing.
  • Large Ham: Not just large, massive. He competes with a World of Ham and manages the impressive feat of being one of, if not the hammiest ham in the land of Ooo.
  • Last of His Kind: According to Word of God, Finn thinks he's one of these. We certainly haven't been shown another normal human yet. We thought we did, but they turned out to be Fish People.
    • Whether or not Susan is human is left up in the air, as she never takes off her hat.
    • Another long time member of the cast at least used to be human. One guess who.
    • It's now averted, as BMO's creator, Moe, is still alive and human (well, his skin is).
    • More averted. Betty Grof, Simon's fiancee, ends up literally jumping into the present Ooo in the late season 5's "Betty."
    • Even more averted, now that Finn's dad is running around, albeit not necessarily on Ooo. Sadly, given that he's now the head of a bunch of cosmic criminals, this is a bad thing.
  • Lightning Bruiser: Finn has been shown to excel in all types of combat within the series, plus he is quick to his feet & able to take a HUGE beating. He just destroys any foe that stands in his way.
  • Limited Wardrobe: Invoked a couple of times. For example, a plot point in "BMO Noire" and "Princess Potluck"note  is that he seems to only have one pair of socks, and in "Little Dude" he has to go slay (another!) evil bear if he wants a replacement hat.
  • Love at First Punch: Finn developed his crush on Flame Princess after she smacked him in the face with her (burning) hand and nearly destroyed his house with her fire powers.
  • Love Hurts: Both princesses have caused him no small amount of emotional (and physical) hurt.
  • Love Makes You Dumb: He tells Flame Princess she has this effect on him.
    Finn: When I look at you, my brain gets all... stupid!
    • Several episodes (Too Old, Red Throne) have even had Finn taking a ride on the Jerkass Ball as well because he put trying to impress girls ahead of actually thinking.
  • Made of Iron: The kid has survived battles against multitudes of monsters, cosmic horrors and falling into a volcano, the last of which he did for fun. Painfully subverted in the season 6 premiere, where he loses his right arm.
  • Meaningful Name: "Finn" means "fair-haired." He's blond.
  • Mind over Matter: The flower growing from the stump of his right arm allows him to manifest a shapeshifting arm out of pure psychic energy as well as levitate large objects using what remains of the Grass Sword's magic.
  • Moral Dissonance: Has shown up a couple of times mid-season five where Finn has gone against his usual pure and "righteous" code for his own gain. It hasn't gone well for him.
  • Motive Decay: In "Too Old," Finn focuses on flirting with Princess Bubblegum instead of focusing on the diplomatic mission, rescuing Lemonhope, and basically being a hero.
    • In "The Red Throne," Finn focuses on trying to get back with Flame Princess, ignoring the Fire Kingdom's tyrant problem.
  • Muggle Best Friend/Morality Pet to anything that isn't completely evil. Shades towards All-Loving Hero.
    • Princess Bubblegum tends to show off her creations to him. (She's just as likely to use her own half-baked creation, but perhaps this is just safety testing.)
    • Marceline trusted only Finn with her Fries song.
    • Heck, even the Ice King seeks Finn out when he wants somebody to chat to.
  • Mundane Made Awesome - "ALGEBRAIC!"
    • "Mathematical!"
    • His hat.
  • Neutral Good: In-universe assigned aligment in the comic series.
  • Nice Guy: Probably one of the nicest members of the cast.
  • Nice Hat: He apparently skinned a bear to make it. As a baby.
    Finn: My... hat... is... AWESOME!!!
  • Nice Job Breaking It, Hero: Season 4 Finale. Congratulations, Finn. You've single-handedly released the Lich into The Multiverse. And in "Frost & Fire", his obsession to see Flame Princess and Ice King fighting almost causes Ice King's death and the destruction of Ice Kingdom, and also ends hurting Flame Princess feelings, leading to their breakup at the end of the episode. When the Ice King tells you that you blew it, you know you really blew it.
    • Taken to an extreme in the Season 6 opening two-parter. The plan to get Finn to meet his father gets Prismo perma-killed and ends up freeing a whole bunch of cosmic criminals, which, sadly, includes his father.
  • The Noseless: He isn't drawn with a nose but his Farmworld counterpart is. Word of God states that it's a mutation.
  • Not Allowed to Grow Up: Averted. In fact, he grows up in real-time! (He ages every year, according to Word of God.) Though he's only had one on-screen birthday from 12 to 13, his Twitter profile identifies him as 14 as of 11/2012.
  • The Paragon: In "Freak City", Finn refuses to let any of the freaks lay down and let life kick them around. So instead, Finn kicks them around until they decide to stand up for themselves.
  • Parental Abandonment: Not only was had he lost his birth-parents from babyhood, it is heavily implied that his foster-parents, Joshua and Margaret, are also dead, leaving him with only Jake at 12. However, "Billy's Bucket List" reveals that Finn's biological father is still alive.
  • Parenthetical Swearing: He loves this trope.
    "Holy stuff!"
    "What the jug is that?
    "Dump that mess!''
    "Math this..."
  • Pint-Sized Powerhouse: Despite being just a boy, he's a full-fledged adventurer who can hold his own in most fights. He's even been known to put the hurt on beings many times his size and experience, especially when properly motivated.
  • Pretty Boy: His Gaia Online Alternate Universe self is this in the Adventure Time themed chance item, while his FusionFall self is a winsome Gonk.
  • Psychic Static: Even mentally he's a small erratic target. Especially mentally.
  • Psychoactive Powers: The grass sword responds to Finn's wishes and could modify itself to suit them if necessary. The flower remnant growing from the stump of his right arm does so as well. From levitating large objects to forming a shapeshifting psychic limb, it does whatever it can to grant its masters wishes.
  • Pungeon Master: He loves to drop puns.
    "I'm weddy for the wedding!"
    (pushing a zombie into the ground) "You're grounded, mister!"
    (blasting a pig with ice cream) "FREEZE TO MEET YOU!!"
  • Raised by Wolves: They were magic talking dogs, and they were as intelligent as humans. "Boom Boom Mountain" reveals Finn was orphaned as a baby and taken in by Jake's parents. Jake is explicitly his big brother.
  • Rapunzel Hair: Though he lost it soon after it was revealed.
  • Real Men Wear Pink: For example when he spends the night with the Ice King in "Thank You".
  • Reincarnation: In "The Vault", Finn is revealed to have lived several past lives, including the ghost woman haunting him, who was a mercenary named Shoko. He was also the original wearer of the Ice Crown, a dinosaur named Gunther that worked for the Ice Mage that created the crown.
  • Revenge Before Reason: In the aftermath of the incident with his Dad, Finn comes to dislike all of his replacement arms and contemplates getting revenge on his Dad for the loss of his right arm. The flower coming out of Finn's remaining right arm grants his wish by giving him a phantom limb made out of pure telekinetic energy that allows him to move objects with his mind. Using this arm, he builds a tower to space with the intention of finding his Dad to rip off his arm as revenge for the loss of his own right arm. Princess Bubblegum notes that this plan is ridiculous and dangerous, but Finn continues it anyway.
    • Vengeance Feels Empty: When Finn finally reaches his destination, he meets his Dad and punches him out and attempts his plan, only to realize that he can't bring himself to go through with it. Princess Bubblegum reveals that she dressed up as Finn's Dad in order to let him relieve his stress regarding his personal issues with his Dad. Observing his expression she notes that his revenge probably didn't make him feel all that better, and Finn replies that she's correct in that assumption. He even goes on to say that he doesn't really feel all that angry at his Dad anymore.
  • Rhymes on a Dime: Has made up songs on the spot on several occasions, just for the heck of it. With his singing voice the effect is pretty rad.
  • Samaritan Syndrome:
    • In "Memories of Boom-Boom Mountain", Finn reveals his underlying drive to help everyone and everything with their problems because when he was a baby, he once went 'boom-boom' on a leaf and got stuck to it, and went unaided for hours until Jake's parents found him (and eventually adopted him). Finn helps people because someone helped him once.
    • Subverted on at least one occasion, where he mentions that he probably should help the Ice King, but he's too inexperienced and has no clue how to deal with the Ice King's issues. So he beats him up.
  • Screaming Warrior: Goes into this anytime he's in a fight.
  • She Is Not My Girlfriend: Regarding Princess Bubblegum. Jake even calls her his ex at one point.
    • Now the same can be said for Flame Princess as well. There's no telling who he'll be with now.
  • Shipper on Deck: In "All the Little People", Finn finds sentient miniature AT characters and puts them all in crazy pairings. Even before this, he tells Jake that he thinks BMO and Ice King might make a good couple.
  • Singing Voice Dissonance: Throughout the series, he sings with an auto-tuned voice that supposedly comes from a tiny computer he swallowed at some earlier point. Subverted in 'What Was Missing', where he sings a heartfelt song to (and about) his True Companions Jake, Bubblegum and Marceline.
  • The Sleepless: Invokes it at least with the line "Justice never sleeps!" He does sleep regularly.
  • Star-Crossed Lovers: With Princess Flame as of "Hot to the Touch". Finn cannot touch Flame Princess without getting hurt.
  • Summon Magic: It takes him many hours to summon his spirit animals in "Still", but at least he gets a whole bunch of them and they're rather badass, for their species. Hunson is quicker to summon, but his allegiance remains in doubt.
  • Tagalong Kid: In "What Was Missing", Finn said that he thought this trope was the way the others saw him. An odd example, as he's arguably more proactive and competent than nearly everyone else in Ooo most of the time.
    Finn: Do you look down on me 'cuz I'm younger?
  • 10-Minute Retirement: In "Freak City", Finn goes through one of these after getting turned into a foot, during which he memorably goes into Auto-Tuned song. Though it's more thirty seconds than ten minutes. The later episode "Davey" is built around this also with him developing a split personality.
  • Token Human: Occasionally a plot point.
  • Too Kinky to Torture: Displayed prominently in "Jake Suit." In that episode, Jake is sick of Finn using him as a battle suit and seriously hurting him, so he does the same to Finn to get him to admit that it sucks. Unfortunately, even non-conventional forms of torture (getting Finn to read a boring book, embarrass himself in front of his girlfriend's family, etc.) prove ineffective, and when Jake decides to make Finn jump in a volcano, he's completely freaked out when Finn actually begs him to go through with it; as soon as Jake backs out, Finn uses Jake as a suit once again and jumps headfirst into the volcano for the hell of it.
  • True Companions: With Jake, emphasized by both family bonds and loyalty, and with Bubblegum to a slightly lesser extent. As characterization has developed, he may possibly also have this with Marceline, given how highly she regards friendship. All of them take some steps towards becoming True Companions in "What Was Missing", though with Jake being the Wild Card, and Marceline and PB not getting along very well, it takes some considerable effort on his part.
  • Unstoppable Rage: See Berserk Button above.
  • Unwitting Instigator of Doom: For all his heroic deeds, he likewise seems to have a habit of unknowingly causing just as many disasters. Up to reviving the Lich, being an indirect cause to Lincoln's death, giving the Lich what he needed to (nearly) take over the world, heck even trying to wish away the Lich wound up backfiring.
  • Weaksauce Weakness: Finn's fear of the ocean. Finn gets over this by the end of Season 5's "Billy's Bucket List" (He has a few others, but they are rare or unlikely to occur.)
  • We Are as Mayflies: Inverted - it's strongly implied that his canine adoptive family ages in dog years.
  • "Well Done, Son!" Guy: He can only carry on if he knows his dad cares for him, as seen in "Dad's Dungeon". Finn's actual dad, on the other hand, doesn't care that he even exists.
  • What the Hell, Hero?: Delivers one to Bubblegum in "What Have You Done?" when she has the Ice King imprisoned despite him not doing anything wrong. Turns out she intended to beat pained cries out of him. True, it was to cure the Candy Kingdom of a plague he accidentally started, but it's still a bad thing to do. Finn and Jake call her out on it and she does seem to get a What Have I Done moment as a result.
    • Also, in "Frost & Fire", where Finn tricks Flame Princess and Ice King into fighting using her own private issues against her. Ice King even flat out states to Finn, "You blew it."
  • When All You Have Is a Hammer: His response to the black hole he created?
    PB: You blew it, Finn! With this! [Shows bubble-blowing device]
    Finn: Then I'll kill it with this!
  • Why Did It Have to Be Snakes?: He's terrified of the ocean and only the ocean—not rivers, lakes, or puddles. He is also afraid of the body of water in question only if he consciously knows it's the ocean or not.
    • He's also scared of clowns. He especially hates the Clown Nurses.
  • With Great Power Comes Great Insanity: After putting on the Glasses of Nerdicon. Possibly subverted as he knew how everything would proceed, including the madness and subsequent removal of the glasses.
    • Any time he gets any sort of artifact of power it will quickly be taken away from him. (Wizard, Daddy's Little Monster, etc.)
    • In the season five premiere, when he uses the Ice King's crown in the Farmworld.
  • Would Hit a Girl: Finn would hit anything. Except a princess. He's very uncomfortable punching princesses.
  • You Can't Fight Fate: In every alternate universe shown so far, some event happens that makes Finn lose an arm. As of "Escape from the Citadel", Main!Finn lost his as well.
  • You Monster!: This is what you normally respond to when Finn punches a perfectly good sandwich on the floor (from Daddy's Little Monster), manipulate his most recent girlfriend to fight the Ice King face-to-face, and responded by this trope, via having the closest friend to say that "he didn't like her", by said girlfriend.
    Flame Princess: "You meanie!" *throws a small fireball at Finn*
  • Zany Scheme: One day he may be the master of these, in the meantime he gets egg on his face (or Marceline's kitchen floor). Simply lifting Tree Trunks is insufficient. Instead he has to out on thick layers of makeup first. And so on.

    Jake the Dog 

Finn's chummy, size-shifting bulldog friend (not pet) and foster-brother. He is more laid back than Finn, but also enjoys adventure. He sometimes gives Finn brotherly advice, but it is not often helpful.

Voiced by: John DiMaggio

  • Adorkable: Not as much as Finn, but he has many endearing tics. Especially when he's with Rainicorn.
  • Animalistic Abomination: He was spawned from a bump that appeared on his dad's head after he was bitten by a shapeshifting monster. Definitely explains his powers.
  • Ambiguously Jewish: His picture in the Xmas special suggests this.
  • Attack of the 50-Foot Whatever: Part of what his powers entail, the other being shape-shifting.
  • Attention Deficit... Ooh, Shiny!: "Power Animal" deals with how this affects Jake; he wants to find Finn, but keeps getting distracted.
    Jake: (giving his sandwich to BMO) Take my sammich, BMO. I'm gonna look for... (looks at the ground, gasps) A dancing bug!
  • An Axe to Grind: Though it's not very necessary.
  • Badass Adorable
  • Beta Couple: Becomes part of one with Lady Rainicorn.
  • Big Brother Mentor: Sometimes acts as one to Finn.
  • Big Eater: When given a choice of weapons, he chooses sandwich over sword.
  • Big Friendly Dog: sometimes he's big but he's always friendly.
  • The Big Guy: Given that he's a Size Shifter, he definitely qualifies.
  • Big Little Brother: He might be slightly younger or the same age as Finn (he was a puppy when Finn was a toddler), but he's clearly taken the big brother role, along with being his general protector.
  • Brilliant but Lazy: His shapeshifting powers could easily allow him to defeat most enemies, but he's far too lazy to learn to use them to their fullest.
  • Brought Down to Normal: Brought on by a witch. Jake turns out to be completely useless without his powers.
  • Brutal Honesty: Jake is not known for his tact or patience so he tends to blurt out whatever he's thinking.
  • Canine Companion: Or rather, canine best buddy. Do not call him Finn's pet.
  • Chaotic Good: In-universe-assigned alignment in the comic series.
  • Characterization Marches On: Early episodes painted him as the more Neutral Good reasonable half of the duo, before settling on making him a Chaotic Good Jerk with a Heart of Gold.
  • Cloud Cuckoolander: He can be fairly odd at times, to say the least.
  • Collector of the Strange: In "The Jiggler" he reveals he has a mint condition eyepatch collection. It's never mentioned again.
  • Dark and Troubled Past: In "The Apple Thief", Jake says he knows the darker side of the Candy Kingdom. He used to be a criminal who stole purses and hawked stolen bicycles which could explain his actions in "City of Thieves". A later episode actually shows that he was a criminal mastermind who managed to get out of the business.
  • Depending on the Writer: Like Finn, Jake's morals can shift from episode to episode, though he's always on the good side of the scale.
  • Deuteragonist: It's "Adventure Time with Finn and Jake" after all.
  • Disappeared Dad: He has better intentions than most of the Adventure Time fathers, and he really does love and miss his kids, but "Ocarina" framed this approach as not a good thing.
    • It's implied that since his puppies matured into adulthood faster then he thought they would (to point he's actually younger than them), he's under the impression that they really don't need him anymore; unlike Finn a growing boy who definitley needs him. Or it could be Jake just being Jake.
  • Distaff Counterpart: Cake.
  • Even the Guys Want Him: Prismo and Tiffany both seem to really like Jake.
  • Evil Laugh: In "My Two Favorite People", Jake pulls this off surprisingly well.
  • Female Feline, Male Mutt: His genderbent counterpart is a cat.
  • Fetish: Jake has a weird interest in boots, for some reason.
    • In "Freak City", Jake tells Finn he always wanted to be a big foot, and that Finn will understand when he's older.
    • In "Blood Under the Skin" he seemed to really like dressing in lady armor.
  • Furry Reminder: Exhibits canine-like behavior once in a while (i. e. barking).
  • Gasshole: Often farts, usually for fun.
  • Half-Dressed Cartoon Animal: Jake appears to be completely naked, but it's revealed in an episode that he's actually wearing pants. Spun by pixies. They're just invisible.
  • Heroes Prefer Swords: Yes, he has a sword. Why he needs it, no one knows.
  • Heroic Comedic Sociopath: Borders on this. Sometimes he's caring, and sometimes he can be quite an asshole, holding off on helping Finn (when he really needs it too) just to suit his own needs (but he usually ends up saving the day).
  • Interspecies Romance: With Lady Rainicorn. At one point, he's afraid to meet her parents lest they should display Fantastic Racism towards him (there was a war between the two species not so long ago), but it turns out her parents are crazy about dogs, since a dog saved her father's life during the war.
  • Jerk with a Heart of Gold: The latter is typically far more obvious than is usual for the trope, but he'll pull out the Jerk occasionally.
  • The Lancer: To Finn, given that he's his best friend and all.
  • Large Ham: He's voiced by John DiMaggio, whose forte is Large Ham characters.
  • Lazy Bum: He is Brilliant but Lazy, after all. This is most prominent when he doesn't have his powers.
  • Like Father, Unlike Son/Wacky Parent, Serious Child: In contrast to his serious-minded son, Kim Kil Whan.
  • Mama Bear: He can sense when Finn is about to cry, calling it a "mother-daughter thing". He's also generally protective of Finn.
  • Mellow Fellow: Every bit as laid back as Finn is Hot-Blooded, to the point where he accepted his apparently incoming death after his "croak dream".
  • Mr. Imagination: In "Rainy Day Daydream", it manifests as Reality Warper powers. Outside of that episode, it's more subtle, but he often does consult with figments of his imagination, daydream, or otherwise let his imagination run away from him.
  • Mundane Utility: Will use his powers in any way that seems useful.
  • Mundane Wish: Everytime, his first choice will be a sandwich. It appears this is because the idea of wishing for something important terrifies him. Indeed, when Prismo explains to him how he has to make an important wish and word it just right; because worlds will end, babies won't be born, and life hangs in the balance, he throws up. Fortunately Prismo walks him through word by word what he should wish for.
  • Non-Human Humanoid Hybrid: Margaret isn't his biological mother. Jake was born from a lump on Joshua's head that formed after he was bitten by an Eldritch Abomination, and it's highly implied that this is the origin of his strechy powers.
  • Non-Human Sidekick: Not actually all that odd, given the setting.
  • Nuclear Nasty: In the alternate universe featured in "Jake the Dog", the radiation of the first Mushroom War bomb turns him into the Lich.
  • Official Couple: He and Lady Rainicorn. He's dead set on eventually starting a family with her, and as of "Lady and Peebles", Lady is pregnant.
    • He eventually gets one with her in "Jake the Dad"
  • Older Sidekick: Finn started the series 12 years old and Jake is 28 (this is in "magical dog years" though, and it turns out they were actually born around the same time).
  • One of the Kids: Somewhat. He's old for a dog, but he acts a lot like the Kid Hero (eventually childish-acting Teen Hero) Finn.
  • Out of Focus: As the show delves deeper into other character's relationships, Jake has taken a noticeable drop in plot importance.
    • Potentially reversing with the recent revelation of Jake's true parentage.
  • Overprotective Dad: At first with his and Lady's children, strictly adhering to the manual his mom left for him. He stops when he realizes that, like he was as a kid, his children can take care of themselves.
  • Pals with Jesus: While Prismo falls more into Reality Warper than Physical God, the trope sorta applies. He befriends both Prismo and Cosmic Owl by the end of the Season 5 premiere episode. It benefits Jake greatly because Prismo goes out of his way to help Jake word out his wish to screw the Lich over. He even invites Jake to drop by any time.
  • Papa Wolf: He often acts like a father figure to Finn. He is usually very lazy and indifferent about most things, but when something serious happens to his younger companion, you better not be around.
    • His "The Reason You Suck" Speech he made to Princess Bubblegum in "Burning Low":
      Jake: (...) YOU HEARTLESS MONSTER! Do you have any idea how much he's CRIED OVER YOU?! (...)
      ** He later tries to be this to his own children, but he ends up veering into Overprotective Dad territory instead.
  • Parental Neglect: Played with in an extremely depressing way. Jake is initially a devoted father who gives up adventuring with Finn to be with his family, and dotes on the pups to the point of being overprotective. However, being half-rainicorn, they grow to adulthood within a few days. While this initially comes off as Negative Continuity, later episodes featuring his family make it clear that the moments we see are the only moments Jake has spent with his children since their birth, to the point where he hasn't spoken to two of them.
  • Real Men Cook: If there's cooking to be done, he's usually the one to do it. He's also exceptionally talented at it.
  • Reality Warper: Using his imagination. Though only for one episode, and for no explained reason.
  • Reformed Criminal: He once ran a gang of bank robbers who were quite successful when he was younger, but he left the life behind. He pulls his gang back together in "One Last Job."
  • Rhymes on a Dime: He seems to enjoy a good rhyme. Forceed Finn to communicate via rhyme during "Ocean of Fear"
  • Rubber Dog: Has stretching powers that could give Mr. Fantastic a run for his money.
  • Running on All Fours: Well, yeah, he's a dog. He usually goes around on his hind legs, but he'll go on all fours if he needs to go fast or if Finn is riding him.
  • Serious Business: Whenever he makes sandwiches, burritos... well, anything with lots of ingredients, let's just say he becomes attached to his creations like an overprotective mom.
  • Shapeshifting
  • Shipper on Deck: Or at least loves to needle Finn about his crush on Princess Bubblegum. He also looked very pleased when Finn and Flame Princess hugged... And he also got quite excited when he thought PB was jealous. Most likely Jake approves of any sort of relationship Finn has with a girl, so long as Finn's happy with it.
  • The Slacker: He'd rather go with the flow sometimes.
  • Sore Loser: Well, at least when it comes to Card Wars.
  • Spanner in the Works: Jake has trouble sticking to any of Finn's plans.
  • Spider-Sense: Jake has the ability to sense when Finn is about to cry.
  • Story-Breaker Power: Many Finn-centric episodes would actually be solved in two seconds by having Jake around, so his Brilliant but Lazy personality is used to allow Finn to fly solo and rely on his wits instead, and explain why Jake isn't there (to the point where a couple of episodes actually have Jake shrink down and ride Finn so he can see how it all turns out.)
  • Superpowerful Genetics: "Joshua and Margaret Investigations" reveals that he inherited his powers from a monster that implanted an egg sac in Joshua's head.
  • Super Strength: Jake seems to have this as a Required Secondary Power to his stretchy powers.
  • Trademark Favorite Food: Ice cream. Also sandwiches.
  • Why Did It Have to Be Snakes?: He used to have a great fear of vampires, especially Marceline.
  • You Can't Fight Fate: Jake is a very firm believer in this, to the point where he repeatedly attempted to rush to his death due to a supposedly prophetic dream he had.

    Princess Bubblegum 
"Hurry, sweet citizens..."

The young-looking princess and current ruler of the Candy Kingdom. She cares deeply about her citizens. She's also a giant nerd, said to engage in "every branch of geekdom,", but not (as far as we can tell) in the Cosplay Otaku Girl way— she's more of a math and science whiz. She's also a hybrid of human DNA and bubblegum DNA (which Finn finds a-TRACTT-ive~!), despite bubblegum not having DNA, hence her name. She's close friends with Finn, who seems to have a crush on her (however much he tries to deny it), but she brusquely refuses any romantic advances. She finds Jake funny and charming, and has a complicated relationship with Marceline. Although she looks sweet, and is, in general, rather nice, she is actually quite quick to anger, and her wrath is best avoided. She also speaks German, apparently. The second season reveals her first name is Bonnibel, and her true age has also been revealed: 827.

Voiced by: Paige Moss in the 2006 pilot, Hynden Walch in the series

  • Action Girl: If the beatdown she gave Ricardio is anything go by, she definitely qualifies.
    • And just to make sure it sticks, the chase and knife fight in "Wizard City".
  • Affectionate Nickname: Finn sometimes calls her "Peebles", among others.
  • The Ageless: In "The Suitor," PB's suitors say they have been waiting for centuries.
    • In the flashback of "Earth & Water" (fifteen years ago), PB still looks the same age.
    • It's been demonstrated via flashback that scales back centuries (and finally outright acknowledged by Finn) as of "The Vault."
      Finn: PB, you are like a bazillion years old! You're not freaking 19! What the heck?!
      PB: (embarrassed) Hahaha...
      Finn: Weirdo.
    • We may finally have an age for her. Simon and Marcy takes place 996 years ago, and features a glob of friendly pink goo that helps the two out. This glob may be an early stage in Princess Bubblegum's development, making her nearly 1000 years old.
    • If one of the game is to go by, the large pink mass of gum may or may not be her parents of sort, but still fits.
  • Alliterative Name: Her proper name (thus far spoken only by Marceline) is Bonnibel Bubblegum.
  • Anthropomorphic Food: Her body is actually a mass of gum. In Princess Monster Wife, we get to see a cross-section of her head, and she has no physical brain. This is in contrast with Turtle Princess, where we can actually see her brain. See Blob Monster below.
  • Badass
    • Badass Adorable: Aww, look, how quirky and cute- Wait, is she firing lasers?
    • Badass Bookworm: She has singlehandedly created a formula to reverse death itself with no side effects! Aside from being a skilled scientist, she's also surprisingly skilled in hand to hand combat, being strong enough to tear Ricardio's limbs off with her bare hands.
    • Badass Princess: It's pretty easy to see why the Candy Kingdom is as peaceful as it is, with someone like her in charge.
  • Berserk Button: Hurting those she cares about, especially Lady Rainicorn. Ricardio found this out the hard way.
    • In "Apple Wedding", we learned she does NOT tolerate having her authority questioned. (Specifically, if they claim if the "One True King of Ooo" has that authority.)
  • Better as Friends: With Finn. Finn's not really happy with this, but he gets over it as of Incendium.
    • On the other hand, "King Worm" and "The Lich" imply that Finn still harbors romantic feelings or bitterness for Princess Bubblegum. Hinted further when Finn was dealing with depresson over the loss of his arm in "Breezy" and it's the sight of her (along with what would be his next sword) that fills him with a loving warm feeling that causes his flower arm to sprout into a tree and getting his arm back.
  • Beware the Nice Ones: As sweet as she is, to invoke her wrath would be inadvisable. Ricardio learned that the hard way.
  • Big Good: She serves as the main authority figure of the series and is usually the one to who provides Finn and Jake with their missions.
    • Later episodes imply that she has been helping rebuild society in Ooo after the Great Mushroom War.
  • Big Sister Is Watching: She has extensive surveillance network throughout Ooo, reaching even neighboring kingdoms. At the end of The Cooler, she took it down, reminiscent of the scene from The Dark Knight where Lucius Fox destroyed their surveillance network.
  • Bi the Way: Word of Olivia confirmed that Bubblegum used to date Marcy.
  • Blob Monster: The pink goo in Simon & Marcy can easily be seen as proto-Bubblegum, but Word of God confirmed that such pink goo in one of the games is Bubblegum's parents.
  • Blue and Orange Morality: Toes the line. Some of her experiments don't exactly seem all that humane or safe, for example, but it seems her priorities are too long-term to show in 11 minutes a week.
    • There are things that can be guessed at. She is centuries old, but she has explicitly stated that she's not immortal. Considering she's also The Ageless, she may very well not be certain of how long her lifespan really is. Between that, how often she and/or the Candy Kingdom are in danger, and how incredibly high-maintenance the candy people are, it's not really surprising how desperate PB is to have either a competent successor or a way to stave off/undo death as soon as possible.
  • Bunny-Ears Lawyer: Her quirks don't show too much, given the setting.
  • Broken Bird: Not quite as bad as Marcy, but trauma over being possessed by the Lich is what drove her to create Goliad, she's a workaholic who emotionally detaches herself from problems, and the stress of being a No Respect Girl ruler can get to her, as well being the subject of several dogged nice guys' scary affections.
    • "Bad Timing" reveals that she keeps cyanide pills in case her castle is attacked, and the events of the episode drive her to drink at the end.
    • "Something Big" implies that she's repressed so many negative emotions in order to keep herself and the kingdom going, that she's a walking well of raw emotional power, and a prime target for Maja.
  • Celibate Heroine: Of the "Love is a Distraction" variety. Finn, Ice King, Ricardio, Braco, and a throng of other suitors have all tried to woo her at one point, but she all turned them down in favor of ruling over her kingdom properly.
  • The Chains of Commanding: PB occasionally expresses that she'd be relieved to abandon the responsibilities of her position, the problem being that there's no one capable enough to take over for her.
  • Character Development: In "The Cooler", she gets a What the Hell, Hero? speech from Flame Princess, and after admitting she doesn't want to be considered a bad person she stops her Sinister Surveillance.
  • Cheerful Child: Due to a plot-relevant age-down, she was physically 13, and cute as a button to boot.
  • The Chick: Set up this way in the pilot, but the series makes it clear she fills another role - often at the same time!
  • Cool Crown: It can even protect her from the Lich's mind control.
  • Crazy-Prepared: In "Lady & Peebles" she tells Rainicorn that she has calculated every possible disaster and has brought everything they would need. And also implanted a GPS tracker in Finn's ear at some point in the past.
  • Cute and Psycho: She can be a bit crazy sometimes, but she's still ultimately on the side of good.
  • Damsel in Distress: She was captured by the Ice King in the pilot, and being his 'number one', is targeted by him on a frequent basis.
  • Damsel out of Distress:
    • She's kidnapped when she doesn't have effective countermeasures on hand when she out-and-out attacks him successfully (with a tranq gun in "The Glitch", apparently working his pinky over in "Wizards Only, Fools"...).
    • She finds herself in trouble with Ricardio once again in Lady and Peebles, but she manages to beat him up this time, and it wasn't even close.
  • Demonic Possession: The Lich pulls this off on her, ultimately leading to her being shattered in the fight against Finn and the Ice King and put back together, but since some pieces were missing she came back younger, as old as Finn to be exact.
  • Doing In the Wizard: Even though the magic and such in Ooo was implied to be something else, even early on in the show, she's the only one to openly debunk it.
  • Do Not Taunt Cthulhu: Getting Princess Bubblegum angry is generally a bad idea. All her Bunny-Ears Lawyer moments aside, she's not only a badass in her own right, she also rules a nation and therefore has the legal authority (along with the organized militia to back up said authority) to, say, throw dissenters in jail or declare war on other Kingdoms.
  • Dude, Where's My Respect?: She gets plenty of worship and romantic attention, but not a whole lot of respect. Comes to a head in "Apple Wedding", where everyone immediately views the King Of Ooo a complete fraud as having more authority than her and she rages so much that she nearly ruins the whole wedding.
  • Empress Scientist: She's the ruler of Ooo whose power seems to be from the fact that she made most of her candy subjects. (And can make replacements, if necessary.)
  • Flat Earth Atheist: She can be very dismissive of magic, considering it an ignorant term for the use of scientific principles that its users simply don't understand, despite the extremely bizarre nature of Ooo making her skepticism seem arbitrary to everyone else. It should be noted that it's less she doesn't believe magic isn't real, but rather everything called magic is just a subset of science, and goes so far as to call out what scientific principles are being used when she sees magic in action.
  • For Science!
  • Fountain of Youth: Got de-aged to 13, briefly. Otherwise ages slowly, if at all, apparently.
  • Giant Poofy Sleeves: On her 'princess' dresses.
  • Gratuitous German: Uses it fairly often in "What Have You Done?", and a few others.
  • Growing Up Sucks: She tells Finn that she would rather stay 13 than to turn 18 again and have to deal with the responsibilities that come with being an adult ruler.
  • Hollywood Science: In general, she pulls this off quite nicely. It's taken to a whole new level in "Five Short Graybles" when she uses centrifugal force, growth and shrink serums a la Alice in Wonderland, Two Beings, One Body teleportation of a jellyfish and a balloon, White Magic with a Black Magic feel, Frickin' Laser Beams, molecular fabrication, karate, a baseball bat and levitation. All to make a sandwich.
    • Keep in mind that this was "the most perfect sandwich to ever exist, or will exist in the confines of space-time".
  • Hot Scientist: At least for Finn. Ricardio comes around to this as well.
  • 100% Adoration Rating: Her subjects would do nearly anything for her (up to and including donating parts of themselves to her) and she returns that devotion.
    • It seems a large part of this is because she views the majority of the candy people as small children who require constant supervision. Honestly, given their actions, she's not that far off.
  • Hypocritical Heartwarming: As much of a schmuck as Lemongrab is, he's still her schmuck, darn it!
  • I Didn't Mean To Turn You On: She's not romantically interested in Finn at all, but she makes comments sometimes that Finn/Jake perceive as romantic, like when she was turned back into 13 year old and told Finn she liked him, only to dismiss it as "that was five years ago" when she turns back to normal. And of course there's this moment from Burning Low, where she thinks Jake listened to her about Flame Princess, but Jake told Finn she's jealous.
    Princess Bubblegum: Finn, sometimes you want someone and you want to kiss them, and be with them. But you can't, because responsibility demands sacrifice.
    Finn: What are you trying to say?!
    Princess Bubblegum: I'm trying to say that you're a hero, Finn. You're my hero.
  • I Did What I Had to Do: Bonnibel has been forced to take actions that she's regretted for the greater good. Shown clearly in Burning Low when she is nearly forced to allow Finn and Flame Princess to suffocate to prevent the latter from destroying the world.
    • Season 5 throws a lot of this her way. She almost always has a good (or at least plausible) reason for everything she does, but she's not above making sacrifices.
  • Inelegant Blubbering: Bonnibel is not attractive when she cries. When Finn agrees to help her cure her subjects of Freezer Burn Flu, the happiness plus the stress of having her entire kingdom sick nearly makes her burst into tears. Bulging, tear filled eyes, loud sobbing.
  • I Need a Freaking Drink: After she sends Lumpy Space Princess back to a form before she met her true love (who was accidentally erased from existence), she sighs and pours herself a glass of root beer.
  • Insufferable Genius: Pops up from time to time, in the sense that the intelligence gap between her and just about everyone else in the area is wide enough to cause problems. It's been present since "Slumber Party Panic", but really only hits a boil in "Wizards Only, Fool" - they wouldn't have had to leave the hospital if she'd just played along with Starchy's need for a 'magic' cure.
  • Jack Bauer Interrogation Technique: Did this to the Ice King in "Wizards Only, Fools."
  • Jumping Off the Slippery Slope: Subverted in "Rattleballs" when she makes it look like she destroyed Rattleballs.
  • Last Name Basis: No one (apart from Marceline) calls her Bonnibel
  • Lawful Good: In-universe-assigned alignment in the comic series.
  • Love You and Everybody: Feels an "undifferentiated love" for all of her candy people.
  • Mad Scientist: Some episodes seem to indicate that she's not exactly quite right in the head. Add that and the fact that her scientific exploits (case in point: Lemongrab) tend to go wrong half the time, and we get this. In "The Lich", Finn and Jake find her working late into the night creating tiny candy people who farm in a tiny candy sandbox. Then she cuts off one's limbs with a scissor and attaches them to another (which they don't seem to mind much), for no stated reason.
  • Mama Bear: She acts this way towards Lemongrab in "You Made Me!", and is in general willing to go to extreme lengths for the sake of the Candy citizens.
  • Meaningful Name: Her first name is Bonnibel, which means "beautiful girl". Which makes sense considering she was Finn's crush from Seasons 1-3 and is the main princess the Ice King targets.
  • Mini-Mecha: Seems to be wearing one in "Wizards Only, Fools". What's odd is that it only covers her upper torso and follows her arms' movements, leaving her legs fully exposed (with the undersuit she's wearing possibly acting as Powered Armor, though there's nothing for or against this). It's unclear why exactly she felt the need to wear it, though she likely came directly from getting the Ice King to reveal the Wizard City password - Rorschach-style by the sound of it.
  • Modest Royalty: During her off-hours, she's generally very content to hang out with Finn and Jake on their adventures wearing clothing much more simple that you'd expect for royalty, with the exception of keeping her crown.
  • More Dakka: Whenever there is a pressing need for her to save her kingdom/friends through direct action, Peebles will do so with as much force as she can reasonably pull together. Note that she already has a laser-firing joystick-controlled swan bigger than she is - she had at least two guns in "Lady & Peebles", one of which was roughly equivalent to a grenade launcher.
  • Motherly Scientist: Played with; she mainly comes across as a Mad Scientist, and as a result initially had a rather strained relationship with Lemongrab, who she considered to be a failed experiment. Later on, she tries to be more motherly towards Goliad, but when Goliad goes mad with power and attempts to take over the Candy Kingdom PB has no choice but to abandon that attitude in order to stop her. However, she's slowly improving her relationship with Lemongrab, and he even calls her "Mother Princess." She treats the Lemongrabs the way a frustrated but patient mom would treat her annoying "special needs" children, and calls them "boys" affectionately. She even says something along the lines of "I need to keep a closer eye on these two, so they won't get into any more trouble."
    • As of "Too Old" and "Lemonhope Part 1 and 2", how well this applies to the way she views the Lemongrabs is questionable.
  • Ms. Exposition: Often. Unfortunately, she tends to explain things from a broader perspective than necessary - "Burning Low" would have been a lot shorter if she'd given Finn the same explanation she finally gave Jake, for example.
  • My God, What Have I Done?: "Nemesis" strongly implies that her I Did What I Had to Do tendencies are freaking even her out, as she's awkward when asked about the rattleballs robots, and she thinks she's the evil one the peacemaster is looking for. She's not, it's Peppermint Butler.
  • Nerds Are Sexy: Again, at least according to Finn. Even if he doesn't admit it.
  • The Noseless: Like most people in Ooo. she lacks a visible nose.
  • No Respect Girl: She was the one who created the Candy Kingdom and the majority of the candy people, so is angry when the King Of Ooo waltzes in out of nowhere, is proven to be a fraud and her subjects would still rather him than her just because he has a higher title.
  • Odd Name Out: She's the only princess in the series whose name doesn't follow the "(Descriptive Noun) Princess" formula.
  • Out-of-Character Moment: Bubblegum is usually a Damsel out of Distress, saving herself or at least angry that she's in peril. Which is why it's weird in James II where she's just standing in the same place scared when Zombie!James menaces her, thus letting the other James save her and prove himself.
  • Parasol of Prettiness: Sometimes.
  • Plague Doctor: When the plague caused accidentally caused by the ice king was afflicting the Candy Kingdom, she is seen in this outfit.
  • Plot-Relevant Age-Up: In "Too Young", she has to become eighteen again to regain the throne from Earl Lemongrab.
  • Potty Emergency: Happens to Princess Bubblegum at the beginning of the Lumpy Space episode. "I should not have drank that much tea!"
  • Pride: A major Fatal Flaw of hers. She's so adamant that magic isn't anything special that she refuses to pretend to use magic on Starchy to make him feel better. So she's forced to go to Wizard City and drag Finn and Jake along. The Grand Master Wizard offers them forgiveness for trespassing, so long as PB says that "wizards rule." Of course, she refuses, and gets herself, Finn, Jake, and Abracadaniel thrown in jail.
  • Pragmatic Hero: Don't let first impressions fool you: she's willing to stoop pretty low in various situations.
  • Princess Classic: Mostly an Affectionate Parody of the trope, but is often played straight. She is prim, proper, poised, is frequently a Damsel in Distress, and loves pink.
  • Princesses Prefer Pink: Note that she does have other outfits, several of which aren't very pink - the ones she wears as Princess are all pink-ish.
  • Rapunzel Hair: Goes down to her knees (when she has it down).
  • Really 700 Years Old: She's at least 300. In "The Suitor", it's revealed PB's various suitors have been waiting to court her for hundreds of years.
    • "The Vault" is the first episode to directly confirm that PB is actually quite ancient; when confronted about it PB seems to view it as an embarrassing secret.
    • In the game Adventure Time: Explore the Dungeon Because I DON'T KNOW!, she tells the Ice King that she's 827 years old.
  • Realpolitik: Has been steadily getting more willing to keep tabs on everyone, and is willing to directly sabotage other kingdoms (particularly the Fire Kingdom) to maintain peace. However, she also emphasizes using peaceful means first, only stepping up to more violent methods when those have failed.
  • Royals Who Actually Do Something: May actually be the most active of all the Princesses in Ooo. Not that the bar is set terribly high; the only other princesses who seem to do anything other than "exist" are Turtle Princess, who is a librarian, Lumpy Space Princess, who is basically a hobo and occasionally picks up odd jobs (like being an "adventure secretary"/"writer" in "Gotcha!"). The only other princess with a decent track record of doing stuff is Fire Princess, who threatened Candy Kingdom, adventured with Finn, and usurped her father and turned Fire Kingdom's Card-Carrying Villain nature around.
  • Sanity Slippage: PB's been getting more and more... stressed... over the course of the series.
  • Science Hero: Bubblegum's scientific intellect has gotten Finn, Jake, herself, and the whole kingdom out of trouble at times - even if it was her scientific exploits that got them into trouble in the first place.
  • Sherlock Scan: Bubblegum is shown to have this ability in "Sky Witch"
  • Sinister Surveillance: She admits that she spies on everybody in "The Cooler", and doesn't find it to be an issue that people are disturbed by this. By the end of the episode, she seems to get the hint, and unplugs her entire secret surveillance system and locks up the door.
  • The Smart Girl: She's very skilled when it comes to scientific matters. Not like it's hard.
  • Sophisticated as Hell: She provides shades of this, shifting from words like "shall" and "beseech" and phrases like "You seem genuinely penitent" to words like "hun" and "ah-ight" and phrases like "You'd better not freakin' tell anyone!" and "Mondo momma brains!" and "ballblamburglerber".
  • Sour Supporter: Spends most of "Wizards Only, Fool" like this. As she's clearly having to go considerably out of her way (both physically and philosophically) to satisfy a request from one of her subjects, it makes sense.
  • Spear Counterpart: Prince Gumball.
  • Stereotype Flip: Of Princess Classic. She's so pink she's bubblegum, with a modest pink dress and Rapunzel Hair as her default look, but she's actually a Broken Bird workaholic who'll protect her kingdom no matter what the cost and keeps cyanide pills in her meeting room.
  • Surrounded by Idiots: Many of her subordinates are idiots. Possibly justified, as whenever she tries to create smarter subordinates it tends to go badly.
  • Teen Genius: Likely the smartest being in Ooo. Though how 'teen' applies to her is a little questionable.
  • Tomboy and Girly Girl: Girly Girl to Marceline's Tomboy, with appropriate consequences to Marceline's dating advice for Finn. (The show makes it clear that Bubblegum is fully capable of doing 'tomboy' things, and the trope as it is applies primarily to their preferences.)
  • Took a Level in Badass:
    • In the dungeon episode with her magic flying swan that shoots lasers from its mouth by controlling it like a joystick.
    • In "What Have You Done?" Princess Bubblegum was about to beat the stuffing out of Ice King... using pink Power Fists.
    • In "Lady and Peebles", she defeats Ricardio in hand-to-hand combat by tearing off his arm and leg and essentially pummeling him with the very limbs he made for himself.
    • "Reign of Gunthers" solidifies her badass status as she is seen for the first time with a sword and battle attire.
  • Town Girls: The Femme to Flame Princess' Neither and Marceline's Butch.
  • Treehouse of Fun: Her castle is built around a tree.
  • Tsundere: Type B.
  • Unfit for Greatness: Half the time she calls on Finn, it's to make up for her own oversights. Understandably, a lot of this is due to how thinly stretched she is as top scientist and best living diplomat in Ooo, in addition to running the Candy Kingdom part time with little help better than Cinnamon Bun.
  • Unlimited Wardrobe: At least fifteen outfits besides her stock pink dress.
  • Unwanted Harem: There was a point that Finn, Ice King and Ricardio all had crushes on her. She wasn't comfortable with it.
    • She literally has a harem of suitors waiting to date her as seen in "The Suitor." She makes it clear that she wants to focus on her studies and doesn't date. Because of this, some of the suitors have been waiting hundreds of years.
  • Well, Excuse Me, Princess!: Marceline kinda implied this regarding her relationship with Princess Bubblegum in her song in 'What Was Missing'. "Sorry I don't treat you like a goddess", indeed.
  • Well-Intentioned Extremist: She's been shown as willing to pull drastic action if she believes it will aid her citizens. Flame Princess calls her out on this in "The Cooler". Something that PB seems to take to heart.
  • What Measure Is a Non-Human?: Considers her subjects expendable, as she can make more. She has prevented Finn from sacrificing himself and allowed a candy subject to do so because of this specifically.
  • You Do NOT Want To Know: Finn, Jake, and Marceline all agree it is best not to know what PB is up to in her lab.
  • You Gotta Have Pink Hair: Justified since she's made of bubble gum (if it even is hair at all).

    Lady Rainicorn 
"이게 더 좋아?" note 
An odd-looking but beautiful, flying half-rainbow-half-unicorn creature. Also Jake's girlfriend and as of season 5, the mother of their children. She only speaks Korean, which Jake, but not Finn, understands.

Voiced by: Dee Bradley Baker in the 2006 pilot, Niki Yang in the series

"Who wants to play video games?"

BMO, pronounced Beemo, is Finn and Jake's cute Animate Inanimate Video Game system. A bit of a rebel, Beemo sometimes enjoys turning up his volume too loud and running out of batteries during a game. Speaks with a Korean accent, and looks like cross between a Game Boy, Macintosh and a Vectrex. Was built by pre-Mushroom War robotics engineer Moseph Maestro Giovanni to be a companion and best friend to the son he never had and eventually sent into the world by said inventor to "Be More" and find a family.

Voiced by: Niki Yang

  • Ambiguous Gender: Typically referred to as a "he", but was referred to as "M'lady" by Finn in the season 3 premiere. However, he (?) called himself (?) a boy in "Five Short Graybles". And in "Five More Short Graybles" his (?) alter ego claimed to be a girl. The version of him/her seen in the Fionna and Cake stories looks exactly the same, so that's no help either.
    • The WonderCon Q&A panel confirmed that BMO is genderfluid, and both male and female pronouns apply.
  • Animate Inanimate Object: She's a living video game console.
  • Become a Real Boy: Or it wants to, anyway.
  • Breakout Character: Has had a couple of limelight episodes, in fact.
  • Bi the Way: Regardless of his/her gender, s/he has shown interest in characters of both genders (a female chicken and a male bubble).
  • Cassandra Truth: When Jake tells BMO not to mention any of his past life of crime to Finn in One Last Job, but BMO manages to forget keeping it a secret from him. Finn dismisses it as BMO being over-actively imaginative anyway.
  • Cerebus Syndrome: While developed initially as a comedic character to play off of Finn and Jake, BMO has grown to be a very complex character with his two episodes "BMO Noire" and "BMO Lost". Her association with minor episodic characters are often actions of brutality, love, matronly care, or despair. BMO's character arc reached a new level of emotional power in "BMO Lost" when she arrived back home with Bubble. As BMO knocked on the door, Bubble was saddened he would never see his home, but felt he had gotten to know BMO well enough to ask for its hand in marriage. BMO agreed, only seconds before Jake popped Bubble, not knowing his was alive. BMO broke down in tears as Finn and Jake laughed at it. However, Bubble was resurrected, realizing all this time he was Air. Then it goes straight into Stalker with a Crush territory as Bubble explained he would surround BMO in every room, in every space, forever, until the end of time. BMO cheers at this. Damn...
    • In "James Baxter the Horse," BMO sings about being pregnant, carrying around an egg. A butterfly knocks the egg out of BMO's grasp, it shatters on the ground, and BMO starts crying. Wow...
  • Cloud Cuckoolander: As evidenced in the kinds of games he creates, such as an Abraham Lincoln fighting game and "Conversation Parade". Also has a bizarre imagination.
    • Also, in BMO noire, it was implied that BMO is schizophrenic. There is one montage of clips, presented to him via dream sequence, showing him setting up the crime scenario, yet he does not adress this and apparently has no memory of doing so.
      • Also implied in "Five Short Graybles," were BMO is shown having a conversation with his reflection, naming him "Football."
  • Covert Pervert: She watches two slugs make out in "Slow Love".
  • Cute Machine: Lampshaded by Marceline in "Evicted".
    Marceline: "I'm invested in this very cute video game!"
  • A Day in the Limelight: "BMO Noire", "BMO Lost" and "Be More".
  • Do-Anything Robot: BMO can serve whatever function is convenient for the plot. For instance, one time she edited and played back a home movie with a custom background song.
    • And sometimes subverted, like the "ghost-detecting machine" in The Creeps.
    Bubblegum: So, who's the ghost, BMO?
    BMO: Oh, um... I don't have ghost-detecting equipment. I just like taking nice pictures.
  • Eating Machine: BMO's very fond of hot chocolate despite not actually having a mouth.
  • Grew Beyond Their Programming: Mo built and programmed him to "Be More" then just an average robot
  • Magic from Technology or Magitek: No further explanation is given how a video game came to life and gained consciousness, which leads to fan speculation.
    • Eventually is revealed to be a unique robot built by the MO robotics company programmed to "Be More"
  • Malaproper: Especially in "BMO Noire".
    BMO: "I feel like I was hit with a Dracula by King Kong".
  • Massive Numbered Siblings: While unique, BMO's creator made a large number of other Mos, who recognize BMO as family.]]
  • Meaningful Name: Mo revealed BMO is short for Be More.
  • Mirror Monologue: Only in the graybles so far.
  • Mr. Imagination: Takes it to really bizarre heights.
  • No Biological Sex
  • Phantom Zone: It's only ever been seen in one episode so far.
  • Retraux: Crosses over into this, as BMO displays pixellated graphics and plays 8 bit music.
  • Protectorate: Jake orders BMO to watch over a distraught Finn while he heads off to the Flame Kingdom. BMO's reacting a little too enthusiastically is par for the course.
    BMO: If anyone tries to hurt Finn, I will kill them!
    Jake: ...Okay, good.
  • Talking Appliance Sidekick: More of a supporting character than "sidekick" but it still counts.
  • Tagalong Kid: While certainly not a kid in the conventional sense, he's often treated like a rebellious child by Finn and Jake, particularly in "Slow Love". Which may qualify as Hypocritical Humor, given that Finn is a Kid Hero and Jake acts like One of the Kids.
  • Tin Man: In "Donny", Beemo states how as a machine she can not feel pain or emotion but states that it very much hates Donny.

    Lumpy Space Princess 

A purple, floating Lumpy-thing with a star on her head and a pushy attitude. Also, she's apparently Latina.

Voiced by: Pendelton Ward

  • Attention Whore: She crashes Treetrunk's wedding dressed in a wedding gown of her own, saying that everyone is ready to pay attention to her.
  • Big "NO!": Played for Laughs when Finn and Jake spill her beans in "Heat Signature".
  • Bratty Teenage Daughter: To her parents.
  • Character Development: For a long time she'd run away from her parents in a rather immature fit of rebelliousness, being too contrary to admit she couldn't handle the rough life. After Finn and Jake help her reconcile with her parents, however, Word of God indicates that she had discovered a love of nature and the independent life and now spends a lot of time living in the woods (hence her appearance in "Gotcha") while being on good terms with her parents. "Gotcha!" also establishes that LSP is now a published writer.
  • Cloud Cuckoolander
  • Everyone Calls Him Barkeep: LSP for short. It also happens to serve as a formal title (she's the princess of Lumpy Space) and as a description of her (she's a space princess, and she's really lumpy).
  • Forgetful Jones: She can be ridiculously forgetful at times. In "Video Makers" after Jake tells her they're filming a food fight scene she immediately forgets they're filming a scene and gets mad when Peppermint Butler throws food at her.
  • Hidden Depths: As of "Gotcha", it would seem that LSP actually enjoys the homeless life.
  • Honey Trap: Tries to seduce Finn with her lumps so she could write a book.
  • Interspecies Romance: Her crush on Finn.
  • Jerk with a Heart of Gold: She can be a tad hard to get along with at times and tends to be self centered, but she's really not that bad a person deep down and genuinely considers Finn and Jake her friends.
  • Karma Houdini: Has a tendency to become violent when she doesn't get her way. She's also accidentally banished someone to another dimension, almost burned down the Candy Kingdom, and may or may not have raped Finn while he was physically and emotionally compromised.
  • Large Ham: For joke purposes.
  • Lovable Alpha Bitch
  • Precocious Crush: Inverted. She's 15, but has a crush(?) on 13-year-old Finn.
  • Phoneaholic Teenager: She is constantly gossiping through her mobile phone even though she's homeless and living in a forest, on canned beans.
  • The Runaway: Sometime before "To Cut a Woman's Hair" she ran away into the forest and still lives there as of "Heat Signature". She returns home in "The Monster". In "Gotcha" she's once again roughing it, but apparently only because she wants to and is still on good terms with her parents.
  • Shoo Out the Clowns: She's often a source of comic relief, even though she's got darker herself in season five/six times.
  • Silicon-Based Life: Lumpy Space people are made of irradiated stardust.
  • Speaks Fluent Animal: Part of the reason why she was able to survive in the wilderness for as long as she did is because she can understand what animals are saying through their body language (regular animals, not talking animals like Jake).
  • Spear Counterpart: Lumpy Space Prince. Amusingly, and unlike the other counterparts, they have the exact same voice.
  • Spoiled Sweet: Well, spoiled and capable of sweetness if pressed.
  • Suddenly Ethnicity: Apparently LSP's Latina. She had a Quincea˝era in "The Eyes".
  • Thinks Like a Romance Novel: Or a teen drama. Borders on Blue and Orange Morality at times.
  • Valley Girl: With a deep, grunting valley girl accent at that. It doesn't help that all of the Lumpy Space people speak like that.
  • Vocal Dissonance: Her voice is very masculine, to say the least.

    Marceline the Vampire Queen 
"Dang, man, I didn't think you'd ever catch on!"

The queen of the vampires (or so she says). Known to be extremely unempathetic but never cruel, simply doing whatever she pleases even at the expense of others. Was alive at the time of the apocalyptic 'mushroom war'. Subject to a lot of fan "attention", for whatever reason; became extremely popular while only appearing twice in the first season, not counting the opening credits and brief cameos.

Usually decked out in punk-rock apparel. She generally tries to be cool and rather unfeeling, she harbors a very broken spirit due to loneliness in living forever, among other things. Whenever her more sensitive or emotional side is shown, she gets angry. She and fellow immortal Ice King also share a long and painful history together, and she spends much of her time finding and moving into new houses to avoid him.

In the fourth season, it was revealed she has the surname Abadeer.

Voiced by: Olivia Olson and Ava Acres(as young Marcy), and Cloris Leachman as the elderly Marceline in the Farmworld universe

  • Action Girl: She can definitely handle herself in wild situations. Although her lazy side makes it so she doesn't get to show it off much.
  • Affably Evil: When she was an antagonist (which lasted for about one episode, not counting her trickery in "Henchman"); since then she's settled into a more neutral type of personality with a general Lack of Empathy, being more Affably Amoral than anything.
  • Affectionate Nickname: Finn and Jake sometimes call her "Marcie". Ash calls her "Mar-mar".
  • Age Without Youth: Originally; the Farmverse reveals that as a half-demon, her lifespan is well over 1000 years naturally, but without the added bonus of vampirism, her body and magic will vastly deteriorate into old age.
  • Anti Anti Christ: It's suggested because her father is evil incarnate.
  • Attack of the 50-Foot Whatever: Does this all the time, but thus far never in her Cute Monster Girl look; she prefers scaling herself up into monstrous forms for combat purposes. See One-Winged Angel below.
  • Bat out of Hell: Frequently turns into a odd-looking bat when she wants to hide, and she has a giant version that she assumed in her first appearance.
  • Berserk Button: Never steal her axe-bass. 'What Was Missing' suggests that calling attention to her more sensitive side is another button for her.
    • She also takes offense to anyone questioning her "punk rock" cred.
  • Bi the Way: Olivia Olson, the character's voice actress, confirmed that Marceline and Princess Bubblegum used to date.
  • Breakout Character: She's one of the main cast now, though her major appearances are fairly infrequent.
  • Broken Bird: She's had a very harsh life, been betrayed by a lot of people, and scares people away out of fear of it happening again.
  • The Cameo: Happens in "The Duke" for a second near the end, has a non-speaking role in "Movie Makers", and in "Power Animal" at the party in the beginning.
  • Chaotic Neutral: In-universe-assigned alignment in the comic series.
  • Characterization Marches On: Goes from being antagonistic to a Heroic Neutral.
  • Combat Sadomasochist: A minor case.
    "Yeah, it hurts, but I kinda like it. It reminds me of when I'd scrape my knees up as a kid, and my mom would patch me up. You know what I'm sayin'?"
  • Companion Cube: The Ax bass is her most important and valuable possession. But her beloved childhood toy Hambo was her "favorite thing in the whole world", until her Bastard Boyfriend Ash sold it, which caused them to break up.
  • Cool Big Sis: She occasionally acts like this toward Finn.
  • Cool Old Lady: In the farmverse, though she is pretty batty.]]
  • Creepy Child: As a child, and spoken to her teddy bear as she was fixing it: "I'm hurting you because I love you." What really drives it home is that she's completely unfazed at the Scenery Gorn that the Mushroom War has brought.
  • Creepy Good: She may be an ally, but Finn and Jake are still terrified of her.
  • Cute Little Fangs: Though it's fairly clear that her entire mouth is full of sharp teeth.
  • Cute Monster Girl: As a little girl.
  • Daddy Issues: Her daddy in question is rather neglectful and ate her fries she bought when she was young.
  • Dark Is Not Evil: Sure, she's a Vampire Queen responsible for kicking Finn and Jake out of their house (although she does return it), but for the most part she just wants to jam on her axe and record albums with friends.
  • Daywalking Vampire: In addition to keeping herself in the shade or wearing an oversized sunhat, Princess Day shows her having a bottle of sunblock.
  • Eerie Pale-Skinned Brunette: Refer to her page image. And yes, she can get really creepy when she wants.
  • Et Tu, Brute?:
    • Almost everybody Marceline has ever loved has either betrayed her and/or abandoned her. Following her mother's death, she was raised by the Ice King, who became a father figure to her during the early days of the apocalypse, but he doesn't remember his past with her due to his insanity. After that, communication with her birth father is infrequent and often results in him hurting her feelings. Later, a boyfriend steals and sells her stuffed bear, the only memento she had of her days with Simon. Finally, she had a major fallout with Princess Bubblegum, who may or may not have been her girlfriend in the past. As a result, she has a tendency to bottle up her emotions and drive others away before they can get close to her.
  • Everything's Squishier with Cephalopods: She has the ability to turn into a giant tentacle monster. She did it in order to dissuade Finn from asking her out before realizing that he wasn't interested in a date.
  • Family-Unfriendly Death: In the Farmworld, she is killed by the explosion caused by Finn's mayhem.
  • Famous Last Words: In the Farmverse.
    Marceline (To Finn): I warned ya, you butt!
  • Felony Misdemeanor: By itself, her dad eating her fries would seem this, but with a little closer look it serves as another indication that her father never took her thoughts or feelings into consideration, and that taking something that belonged to her, which at this point happened to be something completely trivial, was the final straw.
    (singing) "Daddy, do you even love me? Well I wish you would show it, because I wouldn't know it. What kind of dad eats his daughter's fries, and won't look her in the eyes? There were tears there. If you saw them would you even care?"
  • Flight: Her most used power. It's fairly rare to see her actually touch the ground.
  • Friendless Background: In "Memory of a Memory" we see a flashback of her as a child, describing her stuffed animal Hambo as her only friend; in "Marceline's Closet" she writes a song to the same effect. We later discover that she did have an Intergenerational Friendship growing up with Simon, who gave her Hambo, but that didn't end well.
  • Friendly Neighborhood Vampire: Depends how she sees you. She can be your best friend or worst enemy.
  • Fur and Loathing: The dress she wears in "Henchman" is made from a Whywolf. "Marceline's Closet" shows that she also has a large fur-lined coat, with the head and claws built into it.
  • Giant Flyer: Again, see One-Winged Angel.
  • Girl with Psycho Weapon: If she doesn't want to kill you with her powers of vampirism, she could use her demonic axe bass.
  • God Save Us from the Queen!: Played With
  • Good All Along: Sort of. (see Heel-Face Turn)
  • Half-Human Hybrid/Nonhuman Humanoid Hybrid: We don't know what the other half is, but she was born half demon and became a vampire later.
  • Heel-Face Turn: In her original appearance, she comes in the middle of the night and kicks Finn and Jake out of their own house, leaving them out in the open trying to find a place to live. When they finally do find a place, it just so happened to have been Marceline's... and so she almost kills Finn and Jake, but in the end, gives them their house back because she forgot how much she liked the cave. Second appearance, and Finn and Jake still consider her an enemy. Finn unwillingly becomes her accomplice to her many dark deeds that all turn out Double Subverted. The last scene shows that Finn and Marceline have gained some trust for each other. Third appearance, Finn and Marceline spend the entire episode together, trying to get her soul-sucking father back into the Nightosphere.
    • She's even gone so far as to show genuine concern and even go out of her way to save Finn and Jake in at least one situation where their lives were put in danger.
  • Heroic Neutral: She's far and away the most powerful ally that Finn and Jake have, but is very difficult to motivate into helping solve a problem. The few times she is willing to fight seriously, she's either outclassed by the threat (facing her father) or some supernatural rule prevents her from doing much.
  • I Just Want to Have Friends: Extremely strongly implied; in 'What Was Missing', the Door Lord didn't actually steal anything from her, she just wanted to hang out with her friends and gets intensely embarrassed when this is pointed out. In 'Memory of A Memory', it's shown that she was a borderline Extreme Doormat when it came to her Bastard Boyfriend Ash until he sold her only fond childhood treasure for an entirely pointless reason.
    • If you don't take it as a expression of Les Yay, Marceline's song to Bubblegum can be considered an expression of this; she doesn't even remember why Bubblegum is angry at her and feels she shouldn't have to apologize, but implies she still wants to.
    • She outright admits that she hides tears because she has no friends in "Marceline's Closet". And in "I Remember You" she desperately cries while unsuccesfuly trying to make Ice King remember his life as Simon and their old friendship.
  • Ill Girl: As a child. Simon has to find her chicken soup to restore her to good health.
  • Immortal Immaturity: She's been around for at least a thousand years, but she's really not too much more mature than Finn himself is. At times, he's even more mature than her.
  • Immortality Begins at Twenty: Appears to be about Princess Bubblegum's age.
    • Subverted in the Farmworld, where she has aged badly. Seems she's naturally long-lived - she's quite spry for her age - but probably didn't get the chance to become the Vampire Queen.
  • Informed Ability: Is the Vampire Queen, but seems to be the only vampire in Ooo. Similar-looking characters like her father and her ex-boyfriend Ash are said to be different kinds of creatures in the show or via Word of God.
    • Another definite vampire, Keira the band's lead guitarist, appears in Marceline And The Scream Queens. While she does defer to Marceline, that's because she's the band leader and no mention is made of her being the "Vampire Queen". Additionally, the comic is of ambiguous canonicity relative to the main series.
  • Instrument of Murder: She turned the family axe into a bass guitar.
  • Invisibility: Uses it to sneak in on Ice King's "Fionna and Cake" reading session, and for cheap laughs in "Heat Signature". (It's apparently a vampire power... but she's in the midst of messing with Finn and Jake when she says so.) Given her personality, it's not surprising that she doesn't use it often.
  • Intergenerational Friendship: Had one with Simon Petrikov during the aftermath of the Mushroom War. Has one with Finn and Jake.
  • It Amused Me: This is her reason for everything she does, Jerkassy or not.
  • Jerk with a Heart of Gold:
    • Seemed to be a straight-up Jerkass in her introduction episode (in the "Evicted" song, she sang that she was "1000 years old and just lost track of her moral code"), and then in "Henchman", it was revealed that she's actually a pretty cool chick who enjoys screwing with people but never actually hurts them, and by the end of the episode she and Finn seem to have struck up a friendship, and though Jake presumably still hated/was totally terrified of her, he seems to have warmed up to her to the point of being worried about her when told she was in danger. Since then, she's dropped pretensions towards straight-up Jerkassery.
    • "Heat Signature" provides a good example of this; she pranks Finn and Jake into believing that they're vampires and fools them into doing various embarrassing things, but draws the line at her old ghost gang brutally kicking them for no reason and goes berserk when Finn and Jake are tricked into nearly jumping to their deaths.
  • "Just Joking" Justification: During her more dickheaded early days in show, she leads Finn on a massive mind scarring prank day as her minion. Thought he takes it in good stride when he finds out.
  • Klingon Promotion: She became the Vampire Queen by killing the Vampire King.
  • The Lad-ette: Clearly demonstrated (in a kid-friendly way) through her willingness to fight everyone and everything, in the same way that Finn does. Not to mention, several episodes clearly demonstrate her lack of appreciation for hygiene, whether it be her picking her nose, not washing her hands, or remarking that her armpits stink.
  • Like Brother and Sister: With Finn. 'Go With Me' confirms that neither of them have feelings for each other that way, but it hasn't stopped shippers.
  • Living Forever Is Awesome: Of the two immortal characters, she's the one that has the most fun. Likely subverted in the Farmworld. There was a period of 400 years that she refers to as "boring".
  • Looks Like Orlok: When she gets too hungry, as seen in Red Starved. She also makes her nose look more bat-like when she wants to pick it.
  • Missing Mom: Despite appearances from her father, her mother has yet to be seen - aside from a family portrait in the Abadeer household.
  • Morality Pet: Even a thousand years later, Simon/Ice King still cares about her, even if he can't remember why, and she's notably one of the few characters he's actually cared when he believed they were hurt.
  • Mundane Utility: She uses her powers whenever convenient.
  • Necromancer: "Corpses buried in mud that's black, from death I command you to come BACK!" She did it to throw a party.
  • Nightmare Face: Marceline can do this voluntarily and to great effect. In "Henchmen", she just does it for the reaction on Jake's face, as he is still afraid of vampires. The Adventure Time Team's portion of Frederator blog has a small collection of the faces she made throughout the episode.
  • Noble Demon: Noted by Finn in her second episode, she releases him from being his minion as it's "not as fun when they realize it."
    • She and Lumpy Space Princess raise havoc in Breakfast Princess' place, stealing her things, vandalizing the castle, and assaulting the guards, but they do draw the line at killing them, being visibly relieved when the guy they pushed through a high improvised window landed in something soft.
  • The Noseless: Like the other humanoids. Though she can morph a nose when she wants to smell something or pick it. This carries over to the Farmworld, where she appears to be the only denizen without one.
  • Not a Date: Goes to watch a movie with Finn in "Go With Me", both insisting it's not a date.
  • Not So Stoic: Under her cool and trickster-like demeanor lies a sensitive girl that will cry easily if the right buttons are pushed. (Pissing her off is still a no-no.)
  • Odd Friendship: With Finn, which doubles as an extreme form of an Intergenerational Friendship. Later on she's befriended Jake (though she likes to scare him) and appears to have had one with Bubblegum in the past, though Finn seems to have helped her and Bubblegum patch things up.
  • One-Winged Angel: She often employs this in a serious fight (or when she's trying to scare people), and one of the most memorable is a giant, bat-like creature.
  • Our Demons Are Different: She is a half-demon, with the demon half from her father's side. Appearently, it's reponsible for her unique anatomy, such the white skin, the fangs, and the pointy ears, since she only became a vampire when she was a teenager, and young Marceline already had said traits. It also doesn't influence her morality much.
  • Our Vampires Are Different: Marceline claims that she sometimes drinks blood, but only because it's red, and she mainly "eats" shades of red. Sunlight and garlic aren't instantly fatal, but they still hurt like a mother. It's unclear whether her many abilities are also linked to her vampirism or unique to herself (possibly due to her dad being a demon).
    • Farmworld!Marceline does not appear to have her usual powers and is likely not a vampire. At least in that reality, it seems safe to say that her powers are tied in with her being a vampire.
    • Oddly, her eating the color red rather than blood is noted in The Adventure Time Encyclopedia as being unusual, if not unique even for in-universe vampires.
  • Pointy Ears: Comes from being half-demon, assuming her father is an appropriate representation of demons.
  • The Quincy Punk: Slightly; she's a wild and reckless sort of person, but Ooo in general doesn't seem to find her particularily dangerous. She seems to like the aesthetic more than anything.
  • Rapunzel Hair: Just look at her; it goes down to her ankles.
  • Really 700 Years Old: The show reveals she is over a thousand years old. However her childhood is still After the End, if less so than the current show. It's unclear whether she lived through the Mushroom War or directly afterwards. In "Simon and Marcy", set 996 years earlier, Simon mentions that she's 7, making her 1003.
    • If the only deviation between the main universe and Farmworld is that Simon stopped the Mushroom Bomb, then she must have lived through it, because she refers to him as her friend, meaning she must have met him before in that timeline and therefore in both timelines. That would also place the flashback of the meeting in "I Remember You" before the Mushroom Bomb fell, which validates the theory that the Mushroom War began as a conventional conflict and then escalated.
  • Red Eyes, Take Warning: Does this when she gets upset. Usually an extremely bad sign for whomever made her upset.
  • Sad Clown: Unfortunately she sings from the soul and gets upset when she notices she's let her defenses down.
    • "How can- anyone relate to me? When they cannot see what I see- My vampire eyes see... only blood red- skies. Blood red skies make tears inside that I always hide."
  • Spear Counterpart: Marshall Lee. Though, because his only characterization came from when when Marceline's was telling a Fionna and Cake story - that is, she's describing him and how he would act - he ends up coming off to the viewer as a self-deprecating parody of her.
  • Sudden Anatomy: In "Marceline's Closet," she grows a pair of bat-like nostrils when trying to sniff out Finn and Jake.
  • Superpower Lottery: She has an enormous list of supernatural abilities.
  • Tank-Top Tomboy: Over half her costumes have involved tank tops, and she has all the tomboy characteristics.
  • Telekinesis: Briefly uses some on Finn in "Henchman", curling his arms so he can't interfere with her pranking. It's unclear if it's a demon or vampire power, but the affected object glows red.
  • Tomboy and Girly Girl: Tomboy to Princess Bubblegum's Girly Girl.
  • Town Girls: The Butch to Bubblegum's Femme and Flame Princess' Neither.
  • The Trickster: Generally only in the sense of the way she interacts with people. When she actually gets into a combat-type situation, she prefers a more upfront approach.
  • Troll: Finds a lot of joy in screwing with people in general and Finn in particular, though she seems to draw her limits at actual physical harm, at least lately.
  • Tsundere: Shows quite a few signs of being one to her friends in general, and very strongly suggested to be one in "What Was Missing".
  • The Ugly Guy's Hot Daughter: Applies in the traditional fashion.
  • The Undead: She is a vampire, after all.
  • Unlimited Wardrobe: How many outfits has she worn now? Notably, since she had a different outfit for each of her appearances, she was the first character to avert Limited Wardrobe. Considering that she's over a thousand years old, it's probably not that weird to see her having many clothes.
  • Unscrupulous Hero
  • Vampire Monarch: Specifically, she's the Vampire Queen.
  • The Vampire That Doesn't Do Anything: She introduces herself as the vampire queen in 'Evicted', but doesn't seem to have any real connection to or authority over other vampires.
    • However no other vampires have appeared so far. Either they keep their distance or she's wiped them all out.
    • Her presence at the meeting of Ooo royalty suggests that her position is at least somewhat meaningful.
  • Vegetarian Vampire: She drinks blood if provoked, but she mostly just drains the color from red objects. Sometimes the objects are fine afterwards, sometimes they seem shriveled up.
  • Visual Pun: Her bass is an axe.
  • Voluntary Shapeshifting: Has a habit of going from her cute normal form to very grotesque monster forms and back again at the drop of a hat. Her second episode really plays this up.
  • Weakened by the Light: Though, oddly, only by direct sunlight. She'd be just fine on a sunny day with as little as a large hat or parasol, though she does mention that it is painful in a very minor way. It appears to burn quite severely - barely a second's exposure results in a bunch of painful-looking boils (that she can heal away, but still).
  • Who Wants to Live Forever?: She implies this in her Journal Song:
    Marceline: (singing) They don't know what it's like to live forever and forget who they even are...
  • Wound That Will Not Heal: As an adult she has two bite marks on her neck, presumably from the bite that turned her; these are absent when she is shown as a child. Might be Scars Are Forever.

    Ice King 
"I only try to kill you 'cause you're PRINCESS-BLOCKING ME ALL THE TIME."

An unruly monarch from the Ice Kingdom. He can be considered one of the main antagonists of the show, constantly stealing princesses so he can marry them. Once a close friend or even a father-figure of Marceline's, he's spent years pestering her. She says that she tolerates his presence because she loves him unconditionally, and remains one of the few characters to bestow compassion upon him to date.

In truth, these are but the remnants of a pre-apocalypse professor of archaeology and antique enthusiast once named Simon Petrikov, before he was driven insane and transformed by the arcane forces of ice and snow within a crown he bought. The subsequent bouts of madness estranged him from his beloved fiance, Betty, and his nickname for her, "princess", was warped by time and insanity into his compulsion to kidnap and marry princesses in present day Land of Ooo.

Voiced by: John Kassir in the 2006 pilot, Tom Kenny in the series

  • Abhorrent Admirer: To the extreme, in both the romantic and platonic senses.
  • Adipose Rex: Subverted. While he looks extremely stout, it's actually just an optical illusion caused by his beard and abnormally puffy robe. He's actually extremely skinny, bordering on emaciation. Season 4 and 5, however, have shown that he's gained some weight.
  • Adorkable: When he's not being creepy, the Ice King kind of has a bumbling sweetness about him. Its a hold over from his Simon-personality, who is dripping with this.
  • Adult Fear: Going insane and feeling your mind slip away, in addition to driving away your loved ones.
    • Simon was also afraid of leaving little Marcy all alone again if and when he completely lost his mind.
    • Having a small child in your care coughing and feverish in dangerous conditions with no available medicine or nutrients.
  • Ambiguously Brown: Before being cursed with the Crown.
  • Amulet of Concentrated Awesome: If he loses his crown, he loses all his powers. Seems he needed to keep it on his person (if not actually wear it) as Simon, in order to stay alive.
  • And I Must Scream: Somewhere deep within the ball of insanity that is Ice King, Simon's aware of what he is... or at least, when he went back to normal, he was aware. And terrified of becoming Ice King again.
  • And Now You Must Marry Me: His entire purpose in life. He just wants to be Happily Married! Obviously kidnapping princesses and marrying them by force is the only way to make that beautiful dream happen!
  • And Show It to You: It turns out that Ricardio is the result of Ice King accidentally doing this to himself as the result of a botched spell.
  • Anti-Villain: Somewhere between Type II and Type IV. He usually has no idea what he's doing is wrong, but is just too crazy to notice due to his crown.
  • Apocalyptic Log: A series of video tapes show him going from a normal man named Simon, to the Ice King he is now.
    • Artifact of Doom: Revealed to be the cause of his insanity and why he's the way he is. Also appears to have its own will, which it tries to impose on its wearer.
  • Arch-Enemy: Zigzagged with Finn: while he's certainly Finn's most frequently-encountered foe by far, there's very little hate or fear between them: Finn considers the Ice King little more then a nuisance, and Ice King actually considers Finn a friend.
  • Ax-Crazy: He's a very unstable guy and lacking in sanity, even four times tried to kill the protagonists.
  • Badass Bookworm: His former self Simon Petrikov seems to have been this.
    • Simon was definitely this. In Betty, within minutes of awakening he knocks out Ash in one punch because he needs to use his flying carpet. He also manages to whip up a machine that opens a time portal in the time it takes Marceline, Finn, and Jake to get to the Ice Kingdom. (Although it's possible he was working on it during his previous periods of sanity.
  • Bandage Hunk: "What is Life?" demonstrates that his underwear is just some gauze.
  • Backstory Horror: A surprisingly sinister revelation in the last few minutes of the lighthearted "Holly Jolly Secrets simultaneously deconstructed the Laughably Evil and Cloudcuckoolander tropes he so happily personified. The transformation of a perfectly normal human-being into a deranged cartoon character was chilling, to say the least. Later episodes show that the process was slow and painful, driving away his fiancee Betty and a young Marceline through sheer insanity.
  • Beat Still, My Heart: Ricardio's existence.
  • Big Bad: He's the only recurring villain in the show's first two seasons. After that he generally becomes a Harmless Villain, with The Lich taking over as the show's Big Bad. However, he worsens sometimes.
  • Blank White Eyes: Likely a side effect of the crown.
  • Blessed with Suck/Cursed with Awesome: As we learn in "Holly Jolly Secrets," his ice powers helped him survive the nuclear winter, but at the cost of his sanity and humanity, and he outlived the only woman he ever loved. Or so he thought...
    • He also sees crazy things later revealed to be the very real and very creepy denizens of the spirit realm with his "Wizard Eyes" all the time.
  • Body Horror:
    • He temporarily removed his own heart. And gave it life as Ricardio. On another note, during the process that turned him into the Ice King, his skin turned pale blue and appeared frostbitten when his body temperature had dropped to only 80 degrees (F). Presumably he got even colder, as he's fine going barefoot in the snow.
    • Taken Up to Eleven in "Lady and Peebles" when Ricardio makes a body for himself using tissue and broken bones he pilfered from the Ice King. While still inside the Ice King's body.
  • Bowties Are Cool: Simon originally wears a bowtie with suit, as seen in most of his appearances, in Simon and Marcy however, he isn't wearing one.
  • Butt Monkey
  • By the Eyes of the Blind: The crown gave him the ability to hear and see spirits.
  • Cerebus Retcon: Everything about him in "Holly Jolly Secrets."
  • Characterization Marches On: Was a more traditional villain in the original short, being much more of a threat (actually physically engaging Finn/Pen, for one) and playing typical villain tropes like Evil Laugh and Sesquipedalian Loquaciousness straight. There was scarcely a hint of the harmless Cloud Cuckoolander he would become in the series.
    • He's also unusually nasty by later standards in "When Wedding Bells Thaw", in which he comes close to mind-controlling Old Lady Princess into marrying him.
    • And then we found out about his past, making him a Tragic Villain...
  • Classical Anti-Hero: A Chaotic Stupid example
  • Cloud Cuckoolander: Though Deconstructed when it's shown that Simon Petrikov was terrified of losing his mind. The Ice King is less than a shadow of the dignified antiquarian he once was, no longer caring that he's gone insane. "I Remember You" suggests that he's not even aware that he's even gone insane, even with the truth from his own words being sung right in front of him.
    • That said, it's kind of implied that Simon was already a bit of a Cloudcuckoolander, he just wasn't insane. For example, he compares being the Ice King to "living with eternal diaper butt".
  • Continuity Nod: After his back story is revealed several characters refer to the Ice King by his real first name.
    • In "Beyond This Earthly Realm.
    Finn: Ice King? Ice King! Where'd you go, Simon?
  • Cool Old Guy: Sort of. He has a wacky sense of humor, plays on a drum kit and has a bunch of ninja stuff.
  • The Corruption: In "Simon And Marcy", it's shown that Simon is able to resist the crown's influence when he's not actually wearing it, but dangerous circumstances forced him to use its power more often than not. Eventually he becomes the Ice King permanently.
  • Cry for the Devil: It's easy to feel sorry for the poor guy at times, especially after we learn his Freudian Excuse.
  • A Day in the Limelight: "Hitman" gives him the most amount of focus compared to any other episode. "Holly Jolly Secrets" involves his Origin Story, among other things.
  • Dark and Troubled Past: For so lighthearted a character, he has had one of the darkest and most painful pasts of any character on the show, stretching back an entire millenia to when he was a perfectly normal, happy young man. He survived the Mushroom War and a post-apocalyptic ruin of world, and became a temporary guardian to a young girl, but lost it all along the way to insanity and senility.
  • Death Seeker: When he is temporarily reverted to Simon Petrikov, he would rather die than go back to being the Ice King. Betty talks him out of it, saying that she will find him a cure.
  • Determinator: Not the Ice King himself, but his former self, Simon Petrikov. He fought long and hard to try and keep his sanity, and while we know he eventually loses the battle, seeing him trying, and succeeding, at holding onto his mind while using the power of the crown while singing the saddest rendition of the theme song to Cheers ever is amazing.
    • It carried over. Ice King doesn't give up easily on much.
  • Dirty Old Man: Justified, actually. He goes after young princesses because his lost love Betty was young when he last saw her, and his own immortality and insanity began when he was young (albeit artificially aged). Unjustified with him wanting to date Fionna.
    • Granted, he doesn't seem to think he's old.
  • Distaff Counterpart: Ice Queen, who he himself created for his gender-swapped fanfiction.
  • Does Not Like Shoes: Even if he's standing in snow, he won't be wearing any sort of footwear. Probably justified because he isn't affected by the cold.
  • Does This Remind You of Anything?: The ice crown's corruption of his mind have often been compared to alcoholism, Alzheimer's disease and/or dementia.
    • And his "Wizard Eyes" are not unreminiscent of schizophrenia.
  • Dying as Yourself: His goal when the Ice Crown's magic is temporarily removed, reverting him to Simon Petrikov and revoking his immortality.
  • Elderly Immortal: He is immortal in terms of aging, though still unclear.
    • When he's briefly reverted back to Simon in "Betty", Death shows up to taunt him that he'll be the Ice King "'Til the sun blows up". So it seems likely that he is immortal for any reasonable definition of the term.
  • Elemental Powers: His crown provides him with amazing control over ice and snow, possibly augmented by Ice Ninja prowess.
    • An Ice Person: As may be obvious. Knowing "The secrets of ice and snow", he is powerful enough to freeze the entire world, but has refrained from doing so so far.
    • Blow You Away: He commands arctic winds to chill and freeze things and it seems to accompany his flying.
    • Shock and Awe: Uses blue lightning a lot ("Zap"), though it usually just freezes stuff.
  • Enemy Mine: Teams up with Finn to defeat the Lich.
    • This may have been his motivation in "The Cooler", given how badly the Ice Kingdom was affected by just Flame Princess.
  • Enemy Summoner: As seen in "Prisoners of Love".
  • Even Evil Has Standards: Decides to stop pursuing Princess Bubblegum after it's pointed out that he's old and she's been turned into a thirteen year old. In "Hitman", he also draws the line when Scorcher tries to kill Finn and Jake instead of literally hitting them.
  • Evil Is Deathly Cold: Has a low body temperature, but the ice magic is something he does at will.
  • Evil Old Folks: Played with. More insane than anything.
  • Evil Overlord: Has the spiky crown, Faceless Goons (Penguins, Yeti and Type I Snowlems), magic, etc. Every typical aspect of the trope is present, so it is of course totally subverted. He isn't really "evil" for one, and it's often more like he just has the biggest house in the Ice Kingdom.
  • Evil Plan: Kidnapping princesses because the ice crown drove him insane.
  • Expy: From Dr. Two-Brains.
    • Alternatively, his rounded body shape, long nose and affinity with penguins seem reminiscent to The Penguin.
  • Fallen Hero: Though not completely fallen, since some part of mind is still fighting the Crown (it's just buried so deep that not even he is aware of it).
  • Flight: Via his beard.
  • The Fog of Ages: He's been alive since before the Mushroom War, but has only the vaguest memory of times before the series. He can't even remember his own name, let alone his former life.
  • Freudian Excuse: His desire to kidnap princesses is revealed to be a degenerated desire to see his fiance Betty again. Whom he referred to as "his princess".
  • Friendly Enemy/ Vitriolic Best Buds: From Season 3 onwards. Noted to not usually be a "serious threat" in Season 4, so maybe he's improving a little?
    • From Earth & Water to the end of Play Date he lived with Finn and Jake while his kingdom was rebuilt.
  • The Friend Nobody Likes: Seems to be becoming this in Season 5. The others invite him to things and put up with his annoying behavior out of pity. Marceline seems to be the only one who genuinely likes him, and even then it takes her a while to want him around her again, as up until "I Remember You" it was difficult for her to even be in the same room with the guy. It seems that doing so brought back...unpleasant memories for her.
  • From Nobody to Nightmare: Was just a normal human with aspirations to become a certified and respected antiquarian, until he found his crown.
  • Future Loser: Mushroom War era Simon was a certified Badass. Ice King, not so much.
  • Gag Nose: Somewhat odd, given he didn't have one as a human.
  • Harmless Freezing: Applies anytime he freezes something living, which is a little weird given his insanity.
    • It's established that, when he was still oscillating between Simon and the Ice King, he wasn't always so lenient - we see him unnecessarily freeze a deer to death by asphyxiation. He's noticeably holding back in the present day, though whether he does so consciously or not is debatable.
  • Hearing Voices: The insane variation; caused by his crown. That's not figurative, by the way - the crown is established as actually talking/whispering to its user. He doesn't mention them at all in the present day, so he may be tuning them out. Or they don't bother talking to him anymore because he's already a crazy ice wizard. Or he still hears them, but no longer makes any distinction between the voices and his own thoughts, so he doesn't see any point in mentioning them.
  • Heel-Face Turn: Season 3 onwards. He sometimes causes problems, but almost never has any malice to it. And then Princess Bubblegum somehow talked him into attacking the Fire Kingdom directly in a coordinated distraction...
  • Hero of Another Story: As Simon Petrikov during the aftermath of the Mushroom War where he was Marceline's Parental Substitute.
  • Heroic Sacrifice: Farmworld Ice King was able to stop the bomb that would create the Lich, but in doing so was crushed underneath the frozen bomb.
  • Heroic Willpower: The season 5 premiere implies that a normal person would fall into complete insanity in a few hours while wearing the crown, and freeze the world. Not only was Simon able to retain his sanity for long periods of time inbetween bouts of insanity, even 1000 years later as the insane Ice King he still has not fallen to the crown's influence enough as to try to do it. He may be repressing the worst of the crown, or it may even have given up.
  • Hidden Depths: Has more than the rest of the cast combined, thanks to his age and hobbies.
    • Turns out, he can survive on a desert island (actually Island Lady) without using his crown at all. (It's not too surprising when you know his history, but that he can call it up at all comes out of left field...)
  • I Just Want to Be Loved: He said so himself in "I Remember You", and strongly implied in his actions elsewhere.
  • I Was Quite The Looker: Simon was relatively handsome; at least enough to be depicted with the same Generic Cuteness as most other characters (as opposed to Ice King's Gonk big nose and aged appearance).
    • The Ice King himself however doesn't seem to think so- he's too embarrassed to let others find out that he used to wear glasses.
  • Ignored Epiphany: When he gets knocked out while fighting Finn, the Cosmic Owl appears and attempts to tell him he's insane. His response is to call the Cosmic Owl a big nerd, after which he is tickled into consciousness by penguins.
  • Immortality Begins At Sixty: A variation; the crown artificially aged Simon rapidly, but thereafter he doesn't seem to have changed much over the course of the hundreds of years he's been alive.
  • Immortality Inducer: The crown has kept him alive for a very long time. Unfortunately, it's also driven him insane and No Immortal Inertia is in effect.
  • Ineffectual Sympathetic Villain: He generally comes across this way, to the point that it is often hard to consider him a real villain, or even an Anti-Villain. The impression is helped by an apparent unwillingness to take the gloves off unless his life is on the line (something only forced by the Party God and Flame Princess, to date), and even then he holds back some.
  • The Insomniac: Implied in "The Eyes".
  • Jerk with a Heart of Gold: A sympathetic example after he Took a Level in Kindness. He is actually a nice guy, but he does have the tendency to get into rather violent fights with a 14 year old boy and a dog, and he regularly kidnaps and harasses princesses, blatantly ignoring their distaste and cries for help.
  • Large Ham: Simon can be see hamming it up a little to keep Marceline's spirits up as well.
  • Lean and Mean: Subverted. While his large robe gives him the appearance of a large man, he is actually exceptionally skinny (to the point of emaciation) most of the time. However, Ice King is more of an Ineffectual Sympathetic Villain than evil.
  • Limited Wardrobe
  • Literal-Minded: Hires a hitman against Finn and Jake, thinking he is literally going to hit them, not kill them!
  • Logical Weakness: He can't use his powers properly in high temperatures.
  • Loss of Identity: Due to his insanity, he can't even remember who he once was. He's aware that he has a "tragic backstory", but in "I Remember You" he never seems to make the connection that the "lyrics" he wrote are really just his journal, and in "Simon and Marcy" he apparently never realizes that "Simon" in the story Marcelline is telling is him (or, for that matter, that "Marcy" is her).
  • Love Hungry: In "I Remember You," he quite literally yells "love me! Love me! Love me!"
  • Marty Stu: In-universe in-universe example. Writes himself as one in the "Fionna and Cake" universe. He saves Fionna and Cake from Dr. Prince just by reasoning with him, and the duo automatically adore him and become best friends with him for no good reason.
  • Meaningful Name: His heart's name is Ricardio.
    • His true name is Simon Petrikov. Simon being derived from the Hebrew name "Shimon", which means "He who listens". "Petri" means frozen.
  • Neutral Evil: In-universe-assigned alignment in the comic series.
  • Ninja: He has a collection of ice kunai, shurikens, and a book on ice-themed ninjutsu.
  • No Immortal Inertia: As revealed in "Betty". When the Ice Crown is depowered, Simon is revealed to be dying because, as he puts it, "I'm old."
  • No Social Skills: He does have them, if you want to be precise, but even on a good day he misuses them.
  • Not Evil, Just Misunderstood: Or mental, to be precise.
  • Nothing but Skin and Bones: The Ice King is actually very skinny under his robe, though he sometimes works out and consequently buffs up a little..
  • Not-So-Harmless Villain: There's a trend of following every episode where he's deeply tragic with an episode that reminds the audience that he's dangerous. After "Holly Jolly Secrets" comes "Princess Monster Wife", where he mutilates the princesses to create his own, and after "Simon and Marcy" comes "A Glitch Is A Glitch", where he creates a computer virus to delete everybody except him and Princess Bubblegum.
  • Papa Wolf: It's not a good idea to endanger little Marceline when she's with Simon
  • Parental Substitute: Simon was this to Marceline, in the aftermath of the Mushroom War.
  • The Penguins First: When Flame Princess destroys the Ice Kingdom, the Ice King pleads Finn to save Gunther. Subverted immediately afterward ... as Finn runs off to do so, Ice King can be heard in the background clarifying: "... I meant, after you save me."
  • Person of Mass Destruction: On the tapes chronicling Simon's descent into Ice Wizardry, it is shown that the initial transformation was accompanied by the rapid formation of an extremely violent blizzard. It's also possible that this is instead the result of a nuclear winter, presumably from the "Mushroom War," though that would be quite a coincidence.
    • Muddying the waters even further, the alternate universe shows that the crown can, without a live host, freeze the entire world for 400 years. The aforementioned blizzard was likely a subconscious reflection of that. However, Ice King himself never consciously uses his powers this way.
    • While the Ice Kingdom currently covers only a small part of Ooo centered on his cave, there are fjords and what appear to be moraine islands around the entire island.
    • His dandruff is toxic enough to cause a nigh-lethal pandemic.
    • He is capable of depowering the Fire Kingdom's heat source if necessary.
  • Power Born of Madness: The crown granted him ice powers at the cost of his sanity.
  • Prehensile Hair: A secondary power granted by the crown. He can fly with his beard, and he's got no way of flying without it.
  • Really 700 Years Old: He was a part of pre-fall mankind so this makes him the oldest member of the regular cast. In "Simon and Marcy", set 996 years earlier, he mentions he is 47, making him 1043.
  • Redemption Promotion: While he hasn't completely pulled a Heel-Face Turn yet, he is far more effective when helping Finn and Jake than fighting them. He even froze the Lich solid after everything else had failed to beat him.
  • Rule 63: In-universe, he's the creator of the Fionna and Cake world. He initially refers to it as fan fiction, but later on appears to believe - or be trying to, anyway - that they exist somewhere.
  • Sanity Slippage: The crown causes this to happen to him, progressively warping him into the Ice King.
    • Being harassed 24/7 by the spirits in his castle (that only he can see, thanks to his wizard eyes) probably hasn't helped any, either.
  • Saying Sound Effects Out Loud: Likes to vocalize the "Zap!" sound his ice powers make.
  • Sesquipedalian Loquaciousness: Displays this trait a few times in the original short ("FOUL AND NOISOME WHELP!"). Unfortunately, it's all but gone by the start of the actual series.
  • Shaggy Dog Story: His backstory's littered with them. In "Simon and Marcy", it was shown that at some point he began to have control over the crown and keep a hold on his sense of self, and the flashback ends on a hopeful note. This turned out to not be the case. In addition to that, the flashback shows him trying to save Marceline from her fever, but ends with the miracle cure of him feeding her chicken soup, being deluded enough to think that's all he needed to do (and providing the first hint of his intense psychoses) - though, between Marceline's biology and the fact that she was telling this story, the truth isn't totally clear.
  • Shout-Out: Apparently Simon was a fan of Cheers.
  • The So-Called Coward: While he's been shown to be easily horrified by Eldritch Abominations, and Word of God stated that he'd run from The Lich, he actually assisted Finn against him willingly to save Princess Bubblegum.
  • Squishy Wizard: Gets easily smacked down by Finn every time the two come into direct physical contact.
  • Survival Mantra: When Simon put on the crown to protect Marceline, he used the theme from Cheers to keep himself sane. Though eventually, he eventually loses what's left of his sanity.
    • Also, a particularly tragic example as, they could've used any sitcom theme song, but the theme to Cheers specifically is about wanting to go to a place where you have friends who understand your problems, on top of the well-known, "where everybody knows your name" line. Poor Guy.
  • Sympathy for the Devil: The Ooo version of Christmas was created by Finn and Jake solely due to this trope.
  • Token Evil Teammate: Starting with Season 3, when he becomes more sympathetic and other, more villainous villains start showing up.
  • Took a Level in Kindness: In "Hitman" when he saved Finn and Jake's lives three times.
  • Tragic Villain: In a pre-apocalypse Earth, an intelligent, mild mannered antique dealer named Simon Petrikov procured an ancient magic Scandinavian crown. After putting it on in jest, the Crown seized his mind and began altering his body, giving him power over ice. The process, the constant spectres and visions drove him utterly, completely mad, into his present state. The Ice King no longer seems to understand what's happened to him.
  • Unwitting Instigator of Doom: In "Mortal Folly", his pestering of Finn and Jake for their approval to court Princess Bubblegum ruins their best shot at destroying the Lich, who after regaining his power via the Well of Power, destroys the Gauntlet once used to destroy him that Finn himself was about to use. After the Lich is destroyed, the Ice King screws up again by dropping the Princess into the well, which results in the latter being possessed by the Lich, and later, being reduced to a 13-year-old after pieces of her are still missing. Which results in Earl of Lemongrab dropping in to assume a tyrannical rule over the Candy Kingdom. Whew. At least the latter lasted only one episode.
    • He has also been revealed to be the original discoverer of The Enchiridion, a book which holds great importance to The Lich.
    • He is also responsible for Finn losing his demon sword.
  • Villainous Rescue: Assists Finn and Jake against The Lich to save Princess Bubblegum.
  • Villainous Friendship: Gunter the penguin is probably his best friend.
  • Was Once a Man: He used to be a (human) artifact collector named Simon Petrikov, then he started wearing his crown, which drove him insane and gave him powers over ice.
  • Weaksauce Weakness: Losing his beard leaves him flightless and losing his crown removes all his powers. He is also unable to use his ice powers in high temperature environments (along the lines of a steam room or sauna), though can apparently still fly in tropical ones.
  • White Hair, Black Heart: ...well, he's got the white hair, anyway. His heart is also Ricardio, so there's that too, but the Ice King himself comes off as more neutral than evil.
  • Willfully Weak: The Ice Crown gives him enough power to freeze an entire planet for centuries and create entire armies of snow-creatures, but he almost never uses anything close to his full potential. Presumably, whatever remains of Simon keeps his deranged self from tapping into his full powers - we see him cut loose twice in the present day, and both times his life was on the line.
  • Wistful Amnesia: He may not remember, or be capable of being reminded, of his past, but on some level he still remembers enough to drive him to kidnap princesses out of a desire for Betty, and bug Marcelline out of the knowledge that she's important to him, even if he can't remember why.
    • Simon reveals this may work both ways. When his sanity was restored in "Betty" he describes his memories of the ice king as dream-like impressions.
  • With Great Power Comes Great Insanity: Yep, powerful and crazy. And not only was he not always either of those, he achieved both conditions at the same time by the same process.
  • Wizard Beard: A functional one. He uses it to fly.
  • Woobie, Destroyer of Worlds: If more likely to freeze them.
  • Yandere: A rare male example.

    The Lich/Sweet P 
"Aren't you cold... Finn? Walk into the well... Finn. Aren't you cold?"
An undead sorcerer who is supposedly Ooo's greatest evil. He has an army of the living dead and vast magical powers. He was defeated and sealed away in amber inside of a great tree by the legendary hero Billy. Not a funny character at all. Originally called the Lich King, renamed to avoid confusion with that other guy.

In season 5, it was revealed that he was created by the nuclear radiation released from a bomb used in the Mushroom War. Season 6 goes further by implying he was born from the comet that wiped out the dinosaurs.

As of season 6, he has been turned into a giant baby with no memories of being the Lich and is being raised by Tree Tunks and Mr. Pig. However, it seems some small part of the Lich is still inside him...

In "Finn the Human" an Alternate Timeline is created where the bomb wasn't detonated in an attempt to keep the Lich from existing. Unfortunately a series of events in "Jake the Dog" leads to the bomb detonating 600 years later in the present day, creating a new Lich from Jake.

Voiced by: Ron Perlman and - when possessing Princess Bubblegum - by Kevin Michael Richardson.

  • Anthropomorphic Personification: While it's not explicit, his origin, his use of plutonium, his Walking Wasteland status, his affinity for sickly glowing green colors, his long half-life, and his goal of total annihilation make him seem like the personification of nuclear war.
    • Given the implication he was born from the comet that destroyed the dinosaurs, it might be more apt to call him the personification of Mass Extinction. Nuclear war might simply be one shape that takes.
  • Army of the Dead: The Lich was said to command these in his pitch document. A group of skeletons at his lair rise up to try and stop Finn and Jake from entering.
    • In the beginning of Season 6, instead of an army of undead he attempts to use ancient, cosmic criminals to kill all life in the universe. These are guys strong enough to destroy entire planets in seconds; they're probably more effective than undead.
  • Attack of the 50-Foot Whatever: He's larger than Billy and is ENORMOUS in his first appearance.
  • Badass Boast: "You are alone, child. There is only darkness for you, and only death for your people. These ancients are just the beginning. I will command a great and terrible army, and we will sail to a billion worlds. We will sail until every light has been extinguished. You are strong, child, but I am beyond strength. I am the end. And I have come for you, Finn."
  • Badass Longrobe: Part of his Nonstandard Character Design. And the whole friggin' world fears him, he'd be badass no matter what he wore.
  • Bag of Holding: Gets his hands on one in the comic, his plan being to suck up the entire land of Ooo then throw the bag into the sun.
  • Bigger Bad: The Lich is the most powerful and evil villain in the show, but due to being sealed in an amber prison inside a great tree, he didn't have any real role up until the season 2 finale, at which point he becomes the...
  • Big "NO!": INVOKED of all things. What better way to get the hero to do something than to shout "Nooooo!" when he does it?
  • Body Horror: Are those tendons hanging off his arms? Where are his cheeks?
    • The Guardian blood turning him into a baby was also full of this.
  • Body Surf: Finn destroys his real body, so his soul transfers into Princess Bubblegum. After he's defeated again, he transfers again into the Snail, then to Billy. According to Prismo (who would know), he's a "ghost wearing a dead guy", so Billy is dead.
  • Breath Weapon: Can use his Super Smoke to induce fatal Rapid Aging, complete with crumbling into dust.
  • Casting Gag: Of the darkest kind: Ron Perlman provides the unsettling opening and closing narration for the Fallout series of videogames, wherein an intrepid hero explores a nuclear post-apocalyptic earth filled with strange mutated creatures and insane factions.
  • Chaotic Evil: In-universe-assigned alignment in the comic series.
  • Chekhov's Gunman: First appeared in the season 1 finale for about a second in Billy's song, becomes the Big Bad of the second season finale.
  • Comet of Doom: "Evergreen" suggests that the Lich entity originated in this form
  • Compelling Voice: "Fall" is all it takes for The Lich to take the fight out of Finn and Jake.
  • Crystal Prison: Is encased in amber as of the beginning of "Mortal Folly".
    • Happens again in Season 6, but he invokes it to get to the Citadel so he can release the criminals imprisoned there.
  • Dangerously Genre Savvy: The reason for It Only Works Once. It's not that he becomes immune to whatever defeated him, he just makes sure to prevent prior tactics from being used on him again by targeting the source of his defeat. Billy's gauntlet was used to defeat him before, so one of the first things he does is destroy it before Finn can use it against him.
    • And, in the Season 4 Finale, the Lich focuses his attention directly on the two heroes that defeated him in the past. He defeats Billy off screen and then uses his macabre new Billy suit as a tool to manipulate Finn into recovering the gems of power. After completing the Enchiridion the Lich tries a We Can Rule Together temptation specifically because he knew that that never works. When Finn inevitably destroys The Enchiridion to stop his plans, it turns out that was its activation catalyst. Nice Job Breaking It, Hero. Literally.
      • "I couldn't have done it without you, Finn."
    • Billy being the "past" hero to defeat the Lich, this is especially horrifying.
    • Prismo keeps the Lich sealed in his time room where he can't hurt anyone, so the Lich simply sits there and takes abuse until the heroes forget how dangerous he is and discuss their plan right in front of him.
  • Dem Bones: His true form revealed at the Citadel.
  • Do Not Taunt Cthulhu: Most of the cast is treating the Lich like a joke in Prismo's pad at the beginning of season 6. This is not a good idea.
  • The Dreaded: According to Word of God, he's so terrifying that even the Ice King and Marceline will run in terror of him. Princess Bubblegum's reaction to the possibility he's returning in the preview seems to further support this. It winds up being downplayed in the actual episode, as although Princess Bubblegum does truly fear him (Marceline does not even appear), Ice King seems to be completely clueless about the Lich due to his Cloudcuckoolander nature (being more concerned with holes), and he actually eagerly volunteers to help fight the Lich later on.
    • "King Worm" implies that even Finn is afraid of him (and possibly his greatest fear, enough to wake him from his dream).
    • It's so bad, even the creators are scared of him. In the original pitch document, underneath an early sketch of the Lich is the phrase "The Lich King is Not Funny".
    • Even Death himself and Peppermint Butler seem to be at least creeped out by him.
    • While Hunson Abadeer called him pathetic, he admitted that the Lich and his army are capable of destroying Ooo and that he would have taken action against him if it wasn't for Finn. Abadeer also called the Lich his rival.
  • Evil Is Burning Hot: He is able to shoot sickly-green fire. It's usually just there to illuminate his Nightmare Face.
  • Evil Is Deathly Cold: "Aren't you cold, Finn?"
  • Evil Laugh: he laughs a total of three times, usually when everything is going Just as Planned and the heroes are unable to stop him, but also when Finn is tearing his head of with a sweater. It is incredibly disconcerting to hear
  • Evil Sorcerer
  • Evil Sounds Deep: He has a very low and menacing voice, courtesy of Ron Perlman. Although it was supposed to be even deeper, as Pen's original choice was Tom Waits.
  • Face Monster Turn: Implied to be a human mutated into a weapon.
  • Flight
  • Freak Out: Has one when Finn throws the Guardian blood on him, beginning to bring him back to life.
  • From Nobody to Nightmare: While who or what he was isn't made clear, he was a member of the Pre-Mushroom War civilization before the nuclear pollution mutated him into the immensely powerful Omnicidal Maniac. Though considering his Body Surf abilities and the implication he existed far earlier, the core personality of the Lich probably wasn't some innocent victim, just the body of the dude he used.
  • Full-Frontal Assault: Taken Up to Eleven in his Season 6 battle with Finn, when escaping from his Crystal Prison destroys all the clothing and tissue remaining on his body. The result is a giant skeleton whose only covering is a small metal bar on its ribcage over its heart. While SFW, it's at once disturbing, horrifying and wrong.
  • Glasgow Grin: Due to decay, he has a permanent Slasher Smile.
    • When in his ruined Billy disguise the Billy half of his face is stuck in a permanent Cheshire grin while the Lich half tends to look bored (unless he's letting loose his Evil Laugh)).
  • Glowing Eyelights of Undeath: He and anyone he's controlling have these. At least at first; see Morphic Resonance.
  • Hero Killer: One of the more successful examples. Just ask Billy.
    • He comes back in the season 6 premiere to off Prismo, of all people.
  • Humanity Ensues: His fate as of season 6.
  • I Am the Noun: "I am the End."
  • Immortality: Appears to have this, a combination of types four and five, due to being a Lich and his habit of Body Surfing. Word of God has said that he hasn't beaten Death but is cheating him at every turn.
  • Implacable Man: Part of what makes him frightening: his reason for existing is to wipe out all life, and he just won't stop, and has ungodly patience. Trap him in amber? He'll spend years chanting evil spells, just waiting for the first unprotected mind to come within range, break free, and continue like nothing ever happened. Destroy him? He'll just find a new body to continue his rampage. Kill him again? He'll do the above then kill the hero that originally beat him and use him as a suit. Trap him in a room outside of time? He'll just sit there, waiting for the opportunity to strike the nanosecond it presents itself. Trap him in an multiversal prison for cosmic criminals? He'll destroy his prison from the inside out. The best anyone can hope for when it comes to the Lich is to contain him for a time, but he will get back up and pick up where he left off without missing a beat, now knowing just how to counter what you used against him. The only thing that may have truly stopped him is 'rebooting' him into a child, and even that took the blood of cosmic, multiversal guardians.
  • It Only Works Once: Too smart to be defeated the same way twice; Billy's Gauntlet was going to be used to kill The Lich since it worked before. Destroying it is among the first things he does, before even fully recovering. Attacking him with The Power of Love didn't work out so well the second time either.
    • Billy only worked once, considering the Lich is now using him as his new body.
    • As did Prismo. The Lich took swift care of him so the genie couldn't mess with his affairs.
    • Imprisonment in a Crystal Prison only worked the first time. The second time he was put into a crystal prison he melted the place and took control of his fellow inmates who were criminals of a cosmic scale.
  • It's Personal: Does this for Finn and Jake by, respectively, killing Billy and Prismo.
  • It's a Wonderful Plot: An interesting case in which Finn wishes this on him. We then see what the world is like if the Lich hadn't existed. It ends up backfiring as Jake becomes the stand-in for the Lich in the alternate timeline.
  • Karmic Death: Inverted. What ultimately defeats him is the thing he'd spent every waking moment of his existence trying to destroy: life.
  • Knight of Cerebus: Oh hell yes. The first thing you'll notice about him is that unlike the other villains in this show, he has no humorous quirks that can make him any less terrifying.
    • Although the other characters' interactions with him can be pretty funny (such as when Prismo's guests take selfies on him) due to the extreme contrast between their personalities.
    • One scary fact about him is that whenever he shows up someone dies. While Princess Bubblegum got better, his murder of Billy stuck. The writers left themselves an out to bring back Prismo, but it's not been used.
  • Latex Perfection: As Billy.
  • Lightning Bruiser: The other reason It Only Works Once. He's a lot quicker on the draw than he looks.
  • Manipulative Bastard: He manages to use Reverse Psychology on Finn to gain access to the Multiverse.
  • Morphic Resonance:
  • Mind Rape: Has this ability if one isn't wearing the proper magical protection or The Power of Love.
  • Multiversal Conqueror: Revealed to be his ultimate goal in "Wake Up", planning to command the Citadel inmates to exterminate all life in the multiverse.
  • Near Villain Victory: Reaching his well of power and nearly killing Finn, only for Finn to be protected by a sweater, wishing all life in the multiverse to be gone only for the wish to be undone by the only living creature left to make a wish, escaping from the Citadel with its mind-controlled inmates to conquer reality, and being seconds away from killing Finn only to be rendered harmless by the guardian blood. He's been defeated more due to sheer luck than actual skill from the heroes.
  • Necromancer: Well, he is a lich.
  • Non-Standard Character Design: Most of the main cast are made of simple cartoony shapes and bright colours without much detail. The Lich is made from complex shapes that make him look more human, uses dark and threatening colors along with his trademark Sickly Green Glow, and has a lot of detail on his face and all the tendons and flaps of skin hanging off his frame.
  • Nice Job Fixing It, Villain: The Lich's plan: kill Prismo, get taken to the Citadel, release the cosmic criminals there, and form an army to exterminate life in the universe. It's a very good plan, but it has two problems:
    • One, it allows Finn and Jake to get to the Citadel (where they already wanted to go) without being imprisoned in crystal. If the Lich had let them wake up Prismo, they may have been trapped forever.
    • Two, the Citadel contains Guardian blood, a substance capable of defeating him. As far as we know, nothing on Ooo could have done that.
  • Night of the Living Mooks: Can raise an army of the living dead.
  • Nightmare Face: He's got nasty, rotting flaps of flesh hanging off his face where his lips should be.
    • Made worse after his disguise as Billy is ruined showing half of Billy's face stuck in a permanent grin and the rest showing the Lich's skull.
  • Nuclear Nasty: Implied to have arisen as a result of one of the weapons used in the Mushroom War, if "Jake the Dog" is anything to go by.
  • Obviously Evil: His demonic face, dark cloak, skeletal body, and dark magic just make it pretty clear that he's a villain.
  • Oh, Crap: When he realizes he wished for Finn and Jake to return home safely instead of wishing for the end of all life (thanks to Jake's wish).
  • Omnicidal Maniac: According to Princess Bubblegum, his goal is to destroy life. His original wish to Prismo was to destroy all life.
    • It's implied that this has something to do with his being turned into what he is by a nuke.
    • "I will command a great and terrible army, and we will sail to a billion worlds. We will sail until every light is extinguished."
  • One-Winged Angel: In Princess Bubblegum's body, he tricks Finn into getting him the things he needs to fully regain his powers and turns into a gigantic monster that beats the stuffing out of Finn, the Gumball Guardians protecting the Candy Kingdom, and Jake, then tears apart the Candy Kingdom. It ultimately takes an Enemy Mine with Ice King to defeat him. And even then, his soul transfers again.
    • In the final fight between him and Finn, he sheds Billy's guise and returns to his true form.
  • Our Liches Are Different: He was created by a nuclear bomb.
  • Not Quite Dead: The Lich still exists deep within Sweet Pea, the name given to his reborn body by Tree Trunks and Mr. Pig. Sweet Pea is an innocent child, but the Lich can still manifest his presence through him deep within.
  • Person of Mass Destruction: Luckily, he didn't regain his full power...yet.
    • We see him at full power in 'Escape from the Citadel'. He's powerful enough to destroy a multiversal prison for cosmic level criminals (some of which can destroy planets in seconds) just by being there.
  • Phlebotinum Killed the Dinosaurs: In "Evergreen", it is suggested that the Lich originated as an malevolent force possessing the comet that killed the dinosaurs
  • Playing with Fire: Has the ability to shoot green flames from his hands.
  • Power of the Void: The Bag of Holding that he obtains in comics can suck up anything similar to a black hole.
  • Psychic-Assisted Suicide: Tried to make Finn walk into his well, which would likely have killed him (or mutated him horribly).
  • Raise Him Right This Time: After Finn turns him into an apparently-innocent infant, he's left with Tree Trunks and Mr. Pig presumably for this reason.
  • Revive Kills Zombie: The healing regenerative blood of the Citadel Guardians transforms the Lich into a giant baby, seemingly erasing all his memories in the process.
  • Sadist: He seems to have a sadistic glee in torturing their victims psychologically.
  • Sealed Evil in a Can: Was imprisoned in amber by the legendary hero Billy. Unfortunately, said amber turns out to be extremely fragile.
  • Sealed in a Person-Shaped Can: He continues to exist inside Sweet Pea, his reborn body.
  • Sickly Green Glow: If it isn't the flames he shoots it's the bubbling potion he uses to regain his power.
  • Slasher Smile: Initially his default expression is a grin, a grin being the default expression of any skull, but once he's revealed as wearing Billy's skin, he adopts a nasty smile made all the worse by the fact that half of his face is his own, and the other half Billy's.
  • Soft-Spoken Sadist: Usually speaks in a very calm level voice. He even shushes Finn, once.
  • Stealth Pun: He's a zombie that was born from a nuclear bomb. In other words, he has a long half-life.
  • Super Smoke: When the Snail opens a small hole in his amber prison, he escapes through it in the form of an acidic cloud of black smog. Then does the same thing to get through the wall to the outside. As the season 6 premiere demonstrates, he can also use it offensively.
  • Time Abyss: Has at least existed for longer than OOO has, making him over a thousand years old. "Evergreen" implies he somehow originated from the comet that wiped out the dinosaurs, making him tens of millions of years old. "Gold Stars" implies he's existed before the universe, or at least somehow knows what came before it.
  • The Rival: Towards Abadeer, according to the Adventure Time Encyclopedia. It's unknown if the Lich is aware of this.
  • The Undead
  • Vile Villain, Saccharine Show
  • Villainous Breakdown: Loses it in Jake the Dog when Jake makes the wish to negate the human extinction wish just made and send both Finn and Jake back to Ooo, thereby bringing everything back to square one.
    • In "Escape From The Citadel" the Lich finally loses his cool when Finn throws some of the healing blood of the Guardians on him, which begins rapidly regenerating him. He responds by screaming in panic and frantically trying to get it off him as it "reboots" him. He doesn't even have time to use the typical villain defeat phrases.
  • Villain Respect: Admits Finn is strong, but then states his strength is irrelevant.
  • Walking Wasteland/Touch of Death: He leaves a path of death and destruction in his wake. After he possesses Princess Bubblegum, he uses this to wilt an entire room full of flowers with one touch.
  • We Can Rule Together: He attempts this on Finn in the Season 4 finale. It turned out to be a Batman Gambit played on Finn's heroic personality. He rejects the offer and smashes the Enchiridion, which was exactly what the Lich wanted. Had he joined him, the same thing would have played out anyway.
  • Woobie, Destroyer of Worlds: As Sweet Pea, he can easily be seen as this for the way he's bullied and manipulated but retains some connection to his Lich personality.
  • Worf Had the Flu: Finn manages to beat him in the first fight, only because he is prevented from regaining his full strength. When he does later, he's powerful enough to deliver a Curbstomp Battle to Finn, Jake, and the Gumball Guardians of the Candy Kingdom, requiring an Enemy Mine with Ice King to defeat him. Even without his full power, he is able to shatter the gauntlet given to Finn to kill him and knock out Jake in one blast.
    • Even the above was him Worfed. When we finally see his full power in 'Escape From the Citadel', he's strong enough to destroy a cosmic prison for criminals thought worse than him with his mere presence and defeat Finn and Jake with a word. If it weren't for the Guardian Blood, he'd have won with zero effort.

    Flame Princess 
"Don't EVER mess with me again..."
The princess of the Fire Kingdom; who is made out of fire. Beneath her innocent exterior is a deeply destructive and unpredictable personality, with a terrible temper. She has no perspective on the norms of the world and doesn't seem to understand what is right or wrong, likely due to being sheltered by her father. At the end of the third season, she inadvertently becomes Finn's new love interest. By the fifth season, it's clear that she's growing into a more settled personality, having spent time interacting with the world. She eventually usurps the position of ruler of the Flame Kingdom from her father.

Voiced by: Jessica DiCicco

  • Action Girl: She's incredibly powerful and destructive.
  • Always Chaotic Evil: Subverted. She thinks destroying things is fun - but only evil things, as mentioned at the end of "Vault of Bones". While the rest of her races is played straight, She tends to handle situations like a Nineties Anti-Hero. However, she will not, under any circumstances, willingly hurt her boyfriend.
  • Ambiguously Evil: Was this for a good while until the truth came out: she is not truly evil after all, just emotionally disturbed due to being locked in a lamp most of her life because of her having world-destroying powers. However, her father, The Flame King, does state that she and everyone else in the Flame Kingdom are evil, but spending enough time with a good person can potentially change her over to the side of good (although she'd suffer penalties to her experience for doing so).
  • Apocalypse Maiden: She is so emotionally unstable that engaging in kissing makes her physically unstable to the point of causing her to heat up enough to melt through the earth's crust and burn up the entire planet. Luckily, that appears to be the only trigger so far.
  • Armor-Piercing Slap: On Finn.
  • Attack of the 50-Foot Whatever: As she is basically living flame, she's grown to the sort of size this trope covers once or twice, though it's tied to her emotions more than her destructiveness.
  • Ax-Crazy: Whether you think she is good or evil, it's clear she enjoys burning things a little too much, made abundantly clear after going on a rampage in "Vault of Bones"
  • Badass Princess: It is very likely that she is the most powerful princess in Ooo, and she could probably destroy an entire kingdom if she wanted to. In her second episode, she came dangerously close to doing just that (to the Goblin Kingdom, to be precise). She only stopped because she was distracted by Finn crying.
  • Baleful Polymorph: Turns several Fire People into Fire Cats for whispering. This is not the first time she's done this.
    Flambo: So that's where I came from.
  • Berserk Button: Do not lie to her. Ever. And if she likes you, do not reject her. It's also not recommended to keep switching feelings for her. She's also still pretty angry at her father for locking her up in a lamp for most of her life. Speaking of which don't bring up her childhood or call her sweetheart as a result. And don't make fun of her, unless she's cool with you and you do it in a respectful manner.
  • Blue and Orange Morality: Tends to see the world in terms of elemental forces. This works out okay for Finn (he's a "water elemental" with lots of "magic air" in him), but she torches the Goblin Kingdom pretty good in "Hot to the Touch" just fulfilling her elemental destiny (with 0.0 casualties, thankfully). Note that this worldview appears to be unique to her, and isn't shared by any other Fire Kingdom denizens. On top of that, she seems to be trying to approach a more 'normal' worldview over time.
  • Burning with Anger: Flares up into a more monstrous form when angry. Kinda like a... Bedsheet Ghost made of fire? Also when using her flame powers - the more area-effect they are, the less humanoid she is.
  • Can't Have Sex, Ever: A more kid-friendly version: since her powers are influenced by her emotional state, extreme ones like passion and love brought on by something as innocent as a kiss could ignite her so much, her body could burn so hot she could end up burning a hole into the center of the planet. Naturally, she and Finn have to find other indirect methods of dealing with this.
  • Character Development: Her time spent with Finn (and probably just as likely, time spent away from her father and the Fire Kingdom) has rounded her out some, and she is taking steps to be less volatile. She's also shaping up to be a far more fair ruler than her father was. (Unusually for the show, she's shown to learn something and grow with each appearance.)
  • Cute and Psycho: Justified by her background. She seemed to be improving with Finn's company, though, and by "Vault of Bones" she's more "Cute And Enthusiastic-about-burning-things". Since they've broken up, however, she's become more serious.
  • Daddy Issues: She's got some animosity with her father thanks to him sealing her in a lantern for most of her life.
  • Calling Your Attacks: Does this a few times in "Vault of Bones"
    Flame Princess: SCATTER FIRE! SNAKE FIRE!
    • In "Frost and Fire"
    Flame Princess: Infernoooooo Blast!!!
  • Demoted to Extra: After "The Red Throne"... though in-universe this is because she doesn't leave the Fire Kingdom much, so any episode featuring her basically has to take place there.
  • Does Not Like Shoes: Flip-flops on this one. Her first dress didn't come with shoes, but she wears slippers (flats?) with her second dress - maybe she has a better grasp of outside culture by that point? Her third dress in Vault of Bones has her back to being a barefooter, and by the time she's the new ruler of the Flame Kingdom she wears boots as part of her outfit.
  • Elemental Embodiment: To make matters worse, all the fire she creates is actually a part of her - any attempt to curb her destruction causes her pain. However this means that she has absolute control of her fires and so far has chosen to not harm a single non-flame non-evil creature, even when she set an entire inhabited city alight. She currently lives in a house that is a fire on the outside and wood (with books on the wall) on the inside.
  • Enfante Terrible: She burned down a large forest outside of the Candy Kingdom as a baby, garnering the attention of Princess Bubblegum and leading to her being sealed away.
  • Evil Is Burning Hot: Gradually getting closer to an aversion with each appearance. By "Vault of Bones", it seems unlikely that she's evil at all, and certainly has no wish to be.
  • Expressive Hair: When we first meet her, her hair is in the shape of a flame (as pictured above) and at that point she's very temperamental and unpredictable in her moods. In "Vault of Bones", her hairstyle has changed to a more normal-looking bob haircut, only flaring up into its former style when she's startled, and personality-wise she's calmed down quite a bit. This could mean that her first hairstyle indicated how emotionally unstable she was.
  • Fatal Flaw: She has two, her inexperience and her temper. Princess Bubblegum exploits these and plays her like a fiddle in "The Cooler".
  • Fiery Redhead: Has a fiery personality that meshes well with Finn's, to go with that red hair, and tends towards a direct approach and impatience. Also literally, being fire in humanoid shape and all.
  • Flaming Hair: Always on, even when she's sleeping.
  • Flight: Capable of it, as seen in "Frost & Fire."
  • Glass Cannon: She can set whole fields ablaze in an instant, yet feels pain when those flames are extinguished, and can herself be doused like a flame. When exploring or adventuring with Finn, she's more of a Squishy Wizard.
  • God Save Us from the Queen!: Averted to hell and back when she becomes queen of the fire kingdom after overthrowing her dad. She simply wants people to just be honest, imprisoned her dad rather than murdered him (and did so because he was a horrible fit for the kingdom and an out and out terrible father), and forgoes a relationship with Finn for the time being to focus on keeping her people in control for the sake of all the other kingdoms out there.
    • However, she goes into a blind rage and destroys 5 of 6 priceless artifacts in "The Cooler". Granted, this was probably a good thing overall, as while she is unlikely to have ever used them, her brother was clearly looking for an excuse to.
  • Goo Goo Godlike: She was very powerful as a baby. To the point that her father had her abandoned in the wilderness in fear that she would become stronger than him and usurp the throne. He was right of course, but it was still a jerk move.
  • Hair-Trigger Temper: Most noticeable immediately after being released from her lantern ("STOP WHISPERING!!!!" -> *baby Flambos*), but appears to be trying to work it out for Finn's sake. It's less "hair trigger" with each appearance, though she still has a temper.
    • Comes to a head in "The Cooler", where it plays out as her Fatal Flaw. Whether it was on purpose or not, Princess Bubblegum was able to trick her into destroying 5 of 6 ancient weapons in a blind rage and came just short of killing her.
  • Kill It with Fire: Quite enthusiastic about resorting to immolation as a solution for her immediate problems. At the same time, she's only attacked direct threats far.
    • "The Cooler" points out that her area effect fire attacks are a liability even in the Fire Kingdom.
  • Kill It with Water: Hurt by anything that'll put out a fire, in fact (fire retardant, rain, water, tears, and simply stamping out a flame, as established in "Hot to the Touch"). She had gotten a little better at this by "Vault of Bones"; she lit a torch for Finn, and when he later doused it, didn't even react.
  • Klingon Promotion: A more kid friendly variant. Since they obviously couldn't get away with a teenage girl killing her father to obtain the throne, Flame Princess instead stages a coup which results in the (now former) Flame King being trapped in Flame Princess's old lamp, while Flame Princess takes the throne and ascends to the rank of, er, 'King'.
  • Knight of Cerebus: Of a much more nonstandard variety than the Lich. She doesn't appear very often, but when she does her episode will inevitably result in major shifts in the plot accompanied by Finn learning harsh life lessons. She's not a deadly serious villain, but she's a character whose presence always makes the show dive into more complex relationship plot lines than usual.
  • Linear Warriors, Quadratic Wizards: Clearly more powerful than Finn in "Vault of Bones", though they're still young enough that it's not fully clear where their limits are yet. And then there's her general lack of experience.
  • Meaningful Name: Other than the obvious, she's Finn's new flame.
    • Her first name, Phoebe, means "bright and shining" or "bright and pure", which fits her direct personality well.
  • Mind Screw: In her introductory episode, Jake tries to woo her on Finn's behalf (successfully), and then shapeshifts into Finn to continue the process. But when Flame Princess is said to be evil, he immediately recants. When the real Finn meets her, he first saves her, and then tells her he likes her. So, from Flame Princess's perspective, he told her he liked her, then didn't like her, then liked her again. Flame Princess' confusion is palpable, and her reaction perhaps predictable.
  • Mood-Swinger: Goes from being sweet and kind in one moment to screaming at the top of her lungs the next. Largely tapers off as time passes.
    Flame Princess: Come on, honey. Eat your soup.
    Finn: Huh? Wait, wait, wait...
    Flame Princess: EAT IT NOW!!!!note 
  • Mundane Utility: Can control her flames well enough to sense the composition of objects around her (or something), without damaging them: "I'll just use my Heat Sense." More to the point, the fact that she's made of flame means she's a walking light in dark places.
  • The Noseless: Without a nose she can still smell.
  • Not Good with Rejection: To say that she doesn't take rejection well would be putting it lightly. (Though, with Character Development working for her more than any other character in the show, there's a world of difference between her earliest and later reactions to it.)
  • Odd Friendship: In "Earth & Water", she befriends Cinnamon Bun. She likes him because he's honest, and this inspires her to make complete honesty the cornerstone of her rule once she takes the throne.
  • One-Winged Angel: Can transform into a giant monster made of fire.
  • Personality Powers: Her emotional state swayed her fire powers to a considerable degree, initially; even when she's happy she's destructive. In fact, too happy and she could cause the end of the world. She's been getting better about it.
  • Person of Mass Destruction: It gets like ten times worse in each appearance before tapering off in her later appearances such as "Ignition Point", and isn't an issue at all in "Vault of Bones" (she's more aware of her abilities and appears to be trying to avoid falling under the trope, to the point that she no longer trails fire as she walks). She still backslides on occasion if sufficiently provoked, as she devastates the Ice Kingdom and nearly kills Ice King and Gunther in "Frost & Fire". It's also shown in "Earth & Water" that when she was a baby, she set an entire forest on fire merely by walking through it. Part of the reason for this is that she was prophesied to be far more powerful than her father.
    Flame Princess: Fire's purpose is to burn. So I'm going to turn this land into my fire kingdom.
  • Playing with Fire: Naturally. And literally. Skeet shooting with little fireballs appears to be a game for her.
  • Politically Active Princess: Unlike the Candy Kingdom, the Fire Kingdom has war hawks and the occasional backstabbings, so she has had to adapt very quickly and ultimately leans towards a more democratic society than you'd expect from a royal family. While clearly not the genius that Princess Bubblegum is, she genuinely wants peace, and can be seen attending the conference in "Princess Day".
  • Power Incontinence: She apparently has to take special precautions to safely interact with non-Fire Kingdom residents, being living flame and all. Just to play cards with Finn for an extended period of time (in "Vault of Bones"), they have to cover her spot on the couch with foil, and wrap her hands in the same. However, since Jake is able to take her place immediately after she leaves, it's likely an extra precaution rather than a necessity.
    • Later episodes make it clearer that she's gotten much better at controlling her own fire most of the time. She is also poisoned in "The Red Throne", which seems to have capped her power for some time afterwards.
  • The Power of Love: One word can cause her flames to burn brightly, one drop can turn her completely around. If she gets romanced too much, she might destroy the world with her heat.
  • Rebellious Princess: Keep her locked in a lamp, or she'll light up your life. And everyone else if she gets too excited. Though now it's evident that she's rebelling against her father (and nature as living flame) due to having been locked up like that.
  • The Reveal: Flame Princess wasn't locked up because she was evil, Flame King locked her up because Princess Bubblegum had concluded that she was physically unstable and extreme romance would cause her to lose control of her elemental matrix, causing her to burn to the planet's core and destroy Earth in the process. A second one in "Earth & Water" reveals she was locked up because her dad attempted to abandon her in the woods to die as a baby after it was predicted she'd surpass him power-wise. However the attendant he sent to do so had a change of heart after playing with her for a bit and gave her to a foster dad whose house she accidently burned down, proceding to unintentionally take a large portion of the forest with her. Princess Bubblegum then noticed the flames and returned Flame Princess to her father, ordering him to contain her or she would, resulting in her life long imprisonment.
  • Ring of Fire: When Finn is chasing her, she casts one of these.
  • Sealed Evil in a Can: Her father was keeping her far away from the rest of the court inside a kerosene lamp-style glass globe at Princess Bubblegum's behest, partly due to her aforementioned ability to end the world, and partly to keep himself in power.
  • Second Love: For Finn.
  • Self-Fulfilling Prophecy: A messenger brought news to Flame King of his daughter being destined to grow extremely powerful. Fearing that she would one day usurp his position the way he did from the former Flame King, he sent her out into the wilderness to die. But she survived long enough to burn down a large stretch of land outside of the Candy Kingdom, gaining the attention of Princess Bubblegum and causing her to bring the infant Flame Princess right back into the Fire Kingdom with a warning that she should be sealed away. The Flame King constructed a large glass lamp and placed her in it, leaving her there for 15 years, until one day Jake arrived in the Fire Kingdom to find a new love interest for his heartbroken friend. After courting her, she is freed, and after a series of dates and a breakup, Flame Princess returned to take the throne from her father.
  • She Is the King: Her guards refer to her as the "new Flame King" after overthrowing her father.
  • Skilled, but Na´ve: Despite her immense power, she understands next to nothing of the world outside the Fire Kingdom. Seems to be improving at this.
  • Spam Attack: Multiple tiny fireballs.
  • Spell My Name with an "S": Once in a great while, her name will be spelled as "Fire Princess". It sort of makes sense, given that she's from the "Fire Kingdom".
  • Star-Crossed Lovers: With Finn as of "Hot to the Touch". Finn cannot touch Flame Princess without getting hurt, unless she (read: her flames) is severely weakened (read: near death). By "Burning Low", he's learned to take the pain better, but still...
    Flame Princess: ...You would defy nature for me?
  • Superior Successor: According to a royal messenger, Flame Princess was destined to become far stronger than Flame King ever would, so he sent her out to die in the wilderness to die. Naturally he failed, and 15 years later she would indeed take the throne from him.
  • Surrounded by Idiots: She has actual advisers - mostly family - but they aren't much help.
  • That Makes Me Feel Angry: Initially has some trouble describing herself (she's an elemental rather than a typical denizen of Ooo in "Hot to the Touch"), but gradually gets better at it.
  • Third-Option Love Interest: Finn initially loved Princess Bubblegum and got along well with Marceline - but ended up with her, a sort of add-and-divide-by-two version of them in terms of personality.
  • Took a Level in Kindness: Has mostly cooled down by "Ignition Point" by ceasing to be destructive (consciously). Now just chills around with Finn and Jake whenever she appears.
  • Town Girls: The Neither to Bubblegum's Femme and Marceline's Butch.
  • Tsundere: She makes Asuka look tame by comparison! In "Incendium", she blushed at the fact that Finn "likes" her, then immediately slapped him afterwards for his(from her viewpoint) waffling. In "Hot to the Touch", when she was warming up to Finn's declaration of love, she back-pedaled a few seconds later in disgust, saying that he shouldn't toy with her. Her unpredictable and fiery personality really help the trope come out. Not so much from "Ignition Point" onward; even after she and Finn break up in "Frost & Fire", she's more sad than angry.
  • Uptown Girl: For Finn.
  • Violently Protective Girlfriend: She becomes this in "Vault of Bones" when Finn gets captured by a giant Goo Skull. Thankfully, she's gotten a LOT more levelheaded by that point.
  • Weaksauce Weakness: Water. This initially applied to any flames she'd made, but that appears to no longer be the case (she lit a torch for Finn at one point, which he then put out in water to no reaction from her).
  • What the Hell, Hero?: She's less than pleased when she finds out Finn has been tricking her and Ice King into fighting each other. Especially because the last fight was sparked by a fake letter. Containing stuff about her only Finn would know.
  • When All You Have Is a Hammer: As shown in "Vault of Bones", meticulous exploration bores her and she prefers to just burn her way through obstacles. Subverted when she uses Finn's method to free him from the coocoon, since burning up his captor would kill him, or at least greatly injure him.
  • Woobie, Destroyer of Worlds: Averted. She certainly considered taking over Ooo with fire, first thing out of the Fire Kingdom, but Finn and Jake managed to prevent it. On top of that, she seems to have considered it an elemental imperative at the time, likely stemming from a childhood spent cooped up in a glass bottle...
  • Wreathed in Flames: Is in fact living flame, and has a variety of fire attacks at her disposal. Can switch forms as well, but since she defaults to her humanoid appearance, it's probably this and not Elemental Shapeshifter.
  • Yandere: Had shades of this, initially.
    Jake (pretending to be Finn): (after learning she's evil and psycho) Y'know, On Second Thought, we're not really each other's types...
    Flame Princess: ...We're... what?
    Jake (pretending to be Finn): I changed my mind. I don't like you.
    Flame Princess: You... WHAT?!?!?!
  • You Wouldn't Like Me When I'm Angry: No, you wouldn't.
    Flame Princess: You should not toy with the emotions of a fire elemental.