Main Characters (Ice King) | Antagonists and Enemies | Land of Ooo (The Candy Kingdom | Other Kingdoms) | Other Characters | Multiverse Characters
The inhabitants of the Land of Ooo in Adventure Time.
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General
- Adventure-Friendly World: Dungeons with hidden mysteries, trains with each compartment being its own world, kingdoms made of candy, ice, fire; the Land of Ooo is an adventurer's paradise.
- After the End: The Land of Ooo is the Earth 1000 years after a "Mushroom War" wiped out civilization and brought magic back to the world. Ruins of the old world can be seen here or there.
- World of Weirdness: A 12-year-old boy and his talking, shapeshifting dog regularly rescuing a princess made of bubblegum from an evil, insane ice wizard is not even close to the weirdest thing you'll see in Ooo.
Finn and Jake's Family, Friends, and Allies
Family Members
Joshua and Margaret
Voiced by: Kent Osbourne (Joshua) and Maria Bamford (Margaret)
Jake's parents, who also adopted Finn after finding him in a forest. Their job is to hunt monsters around Ooo.
- Abusive Parents: Joshua is a downplayed example. In the prerecorded messages he left for Finn and Jake in his dungeon, he hurls insults at Finn and convinces Jake to do so as well. The harsh words coming from both his brother and father (the latter of whom Finn hasn't seen in years due to Joshua's death) nearly causes Finn to kill himself. However, it's clear that Joshua just misjudged how hurtful his words would be to Finn, as he only said those things as a method of Tough Love rather than out of malice. In his final message, he tells Finn that he loves him and that he knows he'll do great things.
- Action Girl: Margaret, who forms half of Joshua and Margaret Investigations, definitely qualifies. She seems to favor a crossbow and shuriken.
- Badass Normal: By Ooo's definition of normal, anyway. Neither of them has stretchy powers like Jake but are shown to be able to handle enemies powerful enough to beat their super-powered sons easily.
- Battle Couple: They're Happily Married and both of them work together in their monster hunting business.
- Cool Sword: Joshua was the original owner/creator of the Demon Blood Sword.
- Deceased Parents Are the Best: Played with; though flashbacks show that they had their shortcomings (Margaret insisted on following a guide to raising their children that kept them from even the smallest dangers and Joshua encouraged his sons to beat each other up in order to be "tough galoots"), Finn and Jake still remember them fondly.
- Face Full of Alien Wing-Wong: A monster bit Joshua and implanted an egg in his head, which resulted in Jake's birth.
- Kleptomaniac Hero: As Jermaine reveals Joshua stole a lot of stuff from demons... and the demons want their stuff back.
- Happily Married: While they have their disagreements, they clearly love each other and have a stable married life.
- Lookalike Lovers: They look very similar to one another, with the only things that differentiate them being their hats and Margaret's earrings and long eyelashes.
- Motor Mouth: Joshua tends to talk like this.
- Mister Seahorse: Joshua is the one who gave birth to Jake, who popped out of his head after he got bitten by a monster.
- Parents as People: Margaret insisted on strictly following a guide on how to raise children, refusing to expose her sons to even the slightest risk, while Joshua was a strict father who wanted his children to be "tough galoots". However, both of them do love their children very dearly despite these shortcomings.
- Posthumous Character: Both are dead by the time of the first episode, but they appear in flashbacks.
- Pregnant Badass: Although her pregnancy prevents her from being as deadly as usual, Margaret manages to defeat the monster who bit Joshua by herself.
- Scars Are Forever: The reason why Joshua always wears a fedora is to hide a scar he got from giving birth to Jake through his head.
- Standard '50s Father: Joshua talks like a Standard 40's Father, but the intent is still there. The artists clearly made him half-Jake, half-Dad.
- Would Hurt a Child: Double Subverted by Margaret: When she's under the impression that the monster she needs to defeat in order to save her husband is a baby, she starts to apologize... then socks it in the face to take its venom.
Jermaine
"I guess I'm just used to bitter."
Voiced by: John DiMaggio ("Crystals Have Power"), Tom Scharpling ("Jermaine" onwards)
Finn and Jake's third brother. He appears early on in flashbacks, but doesn't appear in person until "Jermaine".
- Aloof Big Brother: Well he's not their big brother, but Jermaine acts like it, preferring to do his own thing. He loves Finn and Jake, but he doesn't get their childlike behavior, so he spends most of his time painting.
- Badass Normal: Despite not having powers, he holds his own when it comes to dealing with demons.
- Big Ol' Eyebrows: Pretty much the only thing that makes him visually distinct from Jake.
- Cool Big Bro: Shows Jake his love and support when Jake comes to visit him in Abstract and helps Jake get past his denial over his revelations and changes. He says that Joshua did inform him about the potential changes, but that he would've been there for his brother anyway.
- The Dutiful Son: Spends his life watching over their father Joshua's stuff, and is jealous of the adventurous life that Finn and Jake lead. Subverted, when Jake points out that he could have left any time he wanted, and Jermaine agrees that he "built his own cage".
- Foolish Sibling, Responsible Sibling: He views himself as the responsible one to Jake and Finn's foolish, since he makes more than one shot about his brothers living in a "playhouse". Deconstructed, since his responsibility of watching over their father's belongings turns out to be entirely self-imposed and he's grown to resent his brothers for having more freedom than he does.
- Green-Eyed Monster: Gets in a fight with Jake over his jealousy that Jake was their father's favorite, while he was left to take care of their father's stuff.
- Middle Child Syndrome: Never explicitly stated, but adds up to the sibling birth order revealed in "Joshua and Margaret Investigations" and to Jermaine's issues towards his brothers (see The Resenter below).
- Only Sane Man: He's a lot more down-to-Earth than either Finn or Jake, and can easily slip into this role when he's around them.
- Shared Dream: He and Jake often appear in each other's dreams.
- The Resenter: Has a lot of pent-up resentment towards his brothers. He gets over it in his titular episode.
- Took a Level in Cheerfulness: He's a lot happier now that he's free to do what he wants. He started out as a landscape painter, though has since shifted to abstract painting (something which bothers Jake, since he's known him for painting landscapes.)
- Visual Pun: He's figuratively and literally a watchdog; he's spent years keeping watch over his father's house and making sure the demons can't steal back their possessions that Joshua took from them, and he also wears a wristwatch that reminds him to turn over a tape in order to keep one of the demons at bay. When the house has burned down and the tape is destroyed, Jermaine throws away his watch since he no longer has to guard anything.
Jake and Lady Rainicorn's Puppies
General Tropes
- Badass Family: After two days they were more capable in a fight than their (admittedly sleep-deprived) father.
- Explosive Breeders: One thousand years in the future Rainicorn/Dog hybrids are the dominant species on Ooo's main continent, having supplanted the Candy Kingdom and driven them from their lands.
- Fusion Dance: In "Jake The Dad", to fight the foxes that were trying to eat Jake, the five of them are shown to combine into... something. They can even involve Jake in it, without him requiring any understanding of what was going on.
- Non-Human Humanoid Hybrid: Half-rainicorn, half-magic dog. well quarter dog and quarter something else.
- Rapid Aging: They become adults in less than a week.
- Spectacular Spinning: Their fused form spins rapidly to attack.
- Superpowerful Genetics: The original five pups were all born with at least one power, a variation of either Jake or Lady Rainicorn's abilities. After a thousand years of breeding and hybridization, future pups are capable of manifesting some devastating powers, if not for Gibbon's efforts to extinguish the powers of his subjects.
- Uneven Hybrid: One half rainicorn, one quarter dog, one quarter whatever it was that impregnated Joshua.
Jake Jr.
Voiced by: Kristen Schaal
One of Jake and Lady Rainicorn's puppies, who inherited Jake's mischievous side.
- Eyeless Face: Unlike the other pups, she doesn't have visible eyes or a nose. She does have several wrinkles on her face, but exactly what they are or why her face is like this is unclear. She also has an unusual mouth which appears to open both horizontally and vertically, and her horn is on her lower back. Turns out her odd face may be inherited from her extra-dimensional "grandfather".
- Gender-Blender Name: She's a girl named Jake.
- In the Blood: She has recently become a thief like her father was in his youth.
- Prehensile Hair: Her hair can grow and be controlled in the same way her father controls his body.
- Rapid Aging: Despite being less than a year old chronologically, she stated in her second appearance that she was 22, then in the very next episode, she was "basically" 30.
- Wacky Parent, Serious Child: In "Another Five More Short Graybles".
- "Well Done, Daughter!" Girl: She wants Jake to be proud of her. He is... especially after she demonstrates what a skilled criminal she is.
- What Does She See in Him?: Believes her mother has strange taste in men.
T.V.
Voiced by: Dan Mintz
Another of Jake and Lady's puppies. He still lives with his mother.
- Basement-Dweller: Lives with his mother and spends his time playing video games.
- Cannot Tell Fiction from Reality: He hallucinates that the events in BP's diary are happening to him. Jake notes that he was always susceptible to fantasy.
- Defective Detective: He becomes a detective at the end of the series. His very powerful imagination and ability to identify with people could theoretically prove to be assets.
- Geek Physiques: He's the chubbiest of his siblings.
- Legacy Character: Ends up restarting Joshua and Margaret's investigation agency.
- Light 'em Up: He's able to make his horn glow brightly.
- Manchild: He's the same age as Kim Kil Whan, but acts like a teenager.
- Momma's Boy: In the sense that he still lives with Lady (and uses her shampoo), but he also seems the closest to her out of all the pups. At the end of "Lady Rainicorn of the Crystal Dimension", he tells her he wants to "learn to be cool, like you."
- Mr. Imagination: He imagines himself as part of BP's diary.
- Rapid Aging: Like the rest of the puppies, though he still acts the most childish.
Kim Kil Whan
Voiced by: Marc Evan Jackson
The most responsible of Jake and Lady's puppies.
- Aloof Big Brother: To his less responsible siblings.
- Beard of Evil: Though he's more amoral than evil, he has a classic pointy villain beard.
- Corrupt Corporate Executive: He buys out his father's treehouse and splits it into thirty-seven tiny apartments that he rents out. Subverted in that this is an effort to get his Dad to get a job and learn responsibility.
- Foolish Sibling, Responsible Sibling: The responsible sibling to Jake Jr. and TV's foolish siblings.
- Interspecies Romance: He's married to a bear, and they have a daughter.
- Jerk with a Heart of Gold: He's not a bad guy, but he's kinda a large jerk to his father in the course of trying to teach him responsibility.
- Rapid Aging: Even more noticeable than his siblings. He has a beard by three days old.
- Rules Lawyer: Jake digs up a golden bone in his yard to buy back the treehouse. Kim Kil Whan reasons that since the yard is his property, the bone already belongs to him.
- Teleport Gun: He can fire lasers from his horn that teleport whatever they hit.
- Took a Level in Kindness: Kim does grow more patient with his dad. In his second episode, we see him participating in a three legged race with Jake before asking him for help with his daughter.
- Wacky Parent, Serious Child: He is extremely responsible, and resents his father's laid-back lifestyle.
- Well-Intentioned Extremist: Forces his father and uncle out of their home in an effort to teach the former to take life seriously and be responsible.
Viola
Voiced by: Paget Brewster
Another of Jake and Lady's puppies.
- Beleaguered Assistant: She ends up becoming one to LSP in "Summer Showers", even though she desperately wants the lead role in LSP's upcoming play. LSP acts like a Prima Donna Director throughout the episode and constantly pushes Viola around until Viola finally has enough.
- Daddy's Girl: Thinks Jake is the best father in the world, despite hardly ever seeing him, and is the only one of Jake's kids who respects him after Rapid Aging.
- The Dog Bites Back: At LSP in "Summer Showers", who makes Viola her personal assistant for her upcoming play and constantly pushes her around. She finally has enough after LSP decides to cast herself in the lead role (despite Viola already knowing the part by heart), teleporting LSP away so she can take part in the show.
- Flowers of Femininity: She wears a large blue flower on her head, emphasizing how feminine she is compared to her more tomboyish sisters.
- Meaningful Name: She's named after the instrument Jake plays, though "Viola" is still a legitimate name in real life.
- Proper Lady: She speaks in a very posh manner. Except around her dad.
- Rapid Aging: As with her siblings.
Charlie
Voiced by: Alia Shawkat
The last of Jake and Lady's puppies.
- Brilliant, but Lazy: She knows she could be good at Card Wars but she's not into it.
- Cool House: Lives in a pre-Mushroom War Egyptian pyramid.
- Exact Words: She agrees to play a game of Card Wars with Jake in exchange for one of his bones. They easily win the first round at the Card Wars tournament, but she quits right after that. In her words, "One bone, one game".
- Fortune Teller: Her main interests are mysticism, spirituality, and cartomancy.
- Intangibility: She can walk through walls.
- Interspecies Romance: Her cartomancy reveals she'll have one with a cat.
- Rapid Aging: Considered to be in her mid-twenties by the time of her first speaking role.
- Sizeshifter: Charlie appears to have inherited this ability from her dad. She is able to grow almost as large as Ooo.
- Strong Family Resemblance: Without her rainicorn attributes she'd look almost identical to Jake, just with freckles and a lighter shade of yellow fur.
Bronwyn
Voiced by: Rae Gray
Kim Kil Whan's daughter and, thus, Jake's granddaughter.
- Bratty Teenage Daughter: Would rather go skateboarding than focus on her schoolwork.
- Heinz Hybrid: Has a dog, rainicorn, bear and Eldritch Abomination in her ancestry.
- Kid Sidekick: "Obsidian" reveals that she's now going on adventures with Finn years after "Come Along With Me". Despite this, she hasn't aged a bit since her last appearance.
- Non-Human Humanoid Hybrid: Where to begin? She is half bear from her mother's side while Kim is of course, half rainicorn from Lady and half dog from Jake while Jake himself is technically half dog and half extradimensional creature, thus, all of his kids would be one quarter dog and one quarter alien being, thus Bronwyn is half bear, quarter rainicorn, 1/8th dog and 1/8th alien
- Rapid Aging: Zigzagged. In her first appearence in "Wheels", Brownwyn is less than a year old, but already a teenager. However, in her appearence at the end of "Obsidian" Bronwyn hasn't aged at all in the several years since then.
- Shock and Awe: Has the ability to turn into electricity.
Friends and Allies
Lady Rainicorn
Lady Rainicorn
"이게 더 좋아?" note 
Voiced by: Dee Bradley Baker (2006 pilot), Niki Yang (the series), Pendleton Ward (using the voice changer)
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.
- Action Girl: She's a "rowdy queen" who's not afraid to go into combat.
- Badass Adorable: She's able to keep up with Finn and Jake in "My Two Favorite People", and she even has to save Finn from the army of lake monsters. Surprising, considering she looks like a little girl's toy.
- Beta Couple: Forms part of one with Jake.
- Bilingual Bonus: Given that she only speaks Korean, this is inevitable.
- Casual Kink: She's often innocently (and on occasion, not-so-innocently) flirtatious with Jake in public.
- Covert Pervert: Some of her untranslated remarks to Jake are raunchy as all hell. Among other things, she asked Jake to make her a sex tape. Which he did.
- Demoted to Extra: Since Season 5, Lady has become gradually less important, with the last few seasons barely giving her any dialogue. She is also absent in the sequel shows Distant Lands and Fionna and Cake.
- Does Not Speak Common: Her preference is to speak in Korean, but she's been known to deliver the occasional Wham Line in English.
- Everything's Better with Rainbows: Crossed with unicorns? Even better.
- Explosive Breeder: By the time of Ooo's future, Jake and Lady's pups have exploded into a gigantic Kingdom called the Pup Kingdom, ruled by Lady's tyrannical immortal God-Emperor grandson, Gibbon. The Kingdom has a space elevator and is implied to have off-world colonies and has totally driven the Candy Kingdom into hiding in the Prize Ball Guardians. Finn and Jake's successors Shermy and Princess Beth fight against Gibbon's empire to free the magic stolen from Jake and Lady's other descendants.
- His Name Really Is "Barkeep": She doesn't have a noble title- her given name actually is Lady and Rainicorn is her family name as well as her species.
- Intangibility: She can phase through walls, as revealed in "The Creeps".
- Interspecies Romance: She (a Rainicorn) forms a Beta Couple with Jake (a Bulldog).
- Nice Girl: She is never shown to be anything but kind and placid, even making the effort to spend time with her boyfriend's kid brother just to get to know him.
- No Sense of Humor: At least when it comes to knock-knock jokes. We don't know what she said in "My Two Favorite People", but Jake tells Finn it wasn't "Who's there?".
- Non-Human Sidekick: To Princess Bubblegum.
- Not Quite Flight: She technically rides on reflected light. She turns in early, but can still fly by night.
- O.O.C. Is Serious Business: Other than when she's using the Universal Translator, Lady only has one line of English dialogue in the series: "I am pregnant!"
- Out of Focus: Prominent in earlier seasons to the point of initially being seen as a main character but doesn't show up often in later ones and is completely absent in Distant Lands and Fionna and Cake.
- Parental Abandonment: Averted as she is the only character shown to be on good terms with both of her parents.
- Pregnant Badass: Serves as Bubblegum's steed even when carrying babies.
- Spear Counterpart: Lord Monochromicorn.
- Superpowerful Genetics: Her children and descendants with Jake all have mutations granting them each unique power. This expands to an entire kingdom in the future where every citizen is born with a power.
- Technobabble: She flies by... er... dancing on photons?
- Transformation Ray: Downplayed; she can shoot a beam from her horn that can change the color of whatever it hits.
- Undying Loyalty: Her translated dialogue shows that she thinks very highly of Princess Bubblegum and takes great offense at any intrusion on the Princess' honor.
- Unicorn: Half, anyway.
- The Unintelligible: Finn can't understand her in the 2006 pilot—Jake can. In the pilot, she only communicated in a series of burbling sounds; in the series, she speaks Korean.
Lumpy Space Princess
Lumpy Space Princess
"Whatever!"
Voiced by: Pendleton Ward
A purple, floating Lumpy-thing with a star on her head and a pushy attitude. Also, she's apparently Latina.
- Attention Whore: She crashes Tree Trunk'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, the creators indicate that she has discovered a love of nature and 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: She comes from a whole realm of these, and often breaks out into party mode at random intervals.
- Deuteragonist: After Jake gets absorbed by Slime Princess, she takes his role as the secondary protagonist in the Elements miniseries. She’s even the one that saves Ooo in the end.
- Drama Queen: No further explanation is needed.
- Early Installment Character-Design Difference: She had sharp fangs in "Trouble in Lumpy Space", but these got phased out and they gave her blunted teeth.
- Earn Your Happy Ending: By the end of the finale, Lumpy Space Princess became the new queen of Lumpy Space and finally gained the respect of her fellow princesses.
- Element No. 5: Lumps takes this role in Ooo's elemental cosmology, making her immune to the elemental kingdoms in the Elements mini-series and allowing her to fix things.
- 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.
- Gonky Femme: She doesn't look or sound remotely feminine, but is a stereotypical valley girl nevertheless.
- Hidden Depths: As of "Gotcha", it would seem that LSP actually enjoys the homeless life. She's also apparently a pretty good writer.
- Honey Trap: Tries to seduce Finn with her lumps so she can write a book.
- Interspecies Romance: Her crush on Finn, sparked after her ex broke up with her.
- Jerk with a Heart of Gold: She can be a tad hard to get along with at times and tends to be self-centered as a byproduct of being a Lumpy Space individual (Finn and Jake came down with similar personalities when they turned Lumpy), 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. She suffers no real consequences for any of her worst behaviors.
- Large Ham: For joke purposes.LSP: MY HEART HURTS BECAUSE I FELL OUT OF LOVE!!
- Last-Minute Hookup: In the finale, Lemongrab 3 and Lumpy Space Princess smooch when all looks lost. The creators stated that they probably dated for at least a little while afterward, but shrugged when asked if the relationship would last.
- The Load: She is typically the least helpful one in the group.
- Lovable Alpha Bitch: She has a lot of issues and jerkass moments, but she's endearing and sometimes means well at least.
- No-Sell: In the Elements mini-series, the conversion that results from exposure to the elemental kingdoms doesn't affect her at all. This is because of the nature of lumps in the elemental cosmology.
- Plucky Comic Relief: She's often a source of comic relief, even though she's got darker herself in seasons five and six.
- Precocious Crush: Inverted. She's 15 at the start of the series 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.
- Shipper on Deck: The Elements miniseries hints that she, while having a small interest in Finn, genuinely believes that he and Fire Princess should be together. At one point when Finn and a maddened and empowered Flame Princess start fighting, she casually mentions while watching the fight that she could still picture the two together. In "Happy Warrior", she makes various comments attempting to get out of Finn the answer that he is still interested in FP and doesn't buy that he is genuinely proud of their friendship.
- 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. Or at the very least, she thinks she can.
- Spear Counterpart: Lumpy Space Prince. Amusingly, and unlike the other counterparts, they have the exact same voice.
- Suddenly Ethnicity: Apparently LSP's Latina. She had a Quinceañera in "The Eyes".
- Thinks Like a Romance Novel: Or a teen drama. Borders on Blue-and-Orange Morality at times.
- Took a Level in Jerkass: In seasons five and six, she tried to burn down the candy kingdom out of perceived jealousy and had a grey-consenting make-out session with Finn. She seems to realize this though, and "Be Sweet" demonstrates some serious self-loathing.
- 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.
- The Virus: Her bite gives you "The Lumps", turning you into a Lumpy Space version of yourself, and if you don't get an antidote by sundown, it's permanent.
- Vocal Dissonance: Her voice is very masculine, to say the least.
- Womanchild: She's about 18-19 by the time of Season 6, but her constant state of mind is that of a spoiled teenage girl. Crosses over with Psychopathic Womanchild when considering her actions in "Bad Timing".
- World-Healing Wave: When given Ice King's crown and the elemental jewels from PB, Flame Princess, and Slime Princess, she's able to undo the elemental transformations and restore the world to normal.
NEPTR
Voiced by: Andy Milonakis
NEPTR (or Never Ending Pie Throwing Robot), pronounced "Nepter", is a robot that throws never ending pies. Created by Finn to get back at Jake for being pranked.
- Ambiguously Evil: For a moment, when Ice King infused him with his private particles he also inherited some of his evil, saying he made his pies with boisenberry and poison, and expressing an interest in kidnapping princesses. He settles on good once he chooses Ice King... to prank with a pie to the face.
- Ascended Extra: He went from a one-off character in "What is Life", to a recurring companion for BMO from "Hot to the Touch" onward. Starting with "Sad Face", his appearances throughout the series increased even further.
- The Bus Came Back: In "Hot To the Touch."
- Butt-Monkey: Other than Finn, he doesn't seem to be liked by many. After "What is Life?", the Ice King, who Neptr thinks of as "pappi", rejects him and mistakes him for BMO. BMO himself, Finn and Jake's other household robot, blew him off when he offered to hand, hinting that BMO in fact views him as inferior.
- Determinator:
- Spent over 15 months playing a game of hide and seek which Finn and Jake forgot about.
- Once spent three months putting together a model town which BMO knocked down in a few seconds.
- Earn Your Happy Ending: In the finale he seen as part of a Rap duo with Flame princess while being cheered on by tons of fans. A far cry from the pariah he was treated as for the majority of the series.
- For the Lulz: Learned the joys of pranking when he threw a pie at the Ice King.
- Fun with Acronyms: As stated above, his name stands for Never Ending Pie Throwing Robot.
- Hide and No Seek: Apparently the reason for his long absence; Finn and Jake forgot that they were supposed to be looking for him.
- Gadgeteer Genius: Managed to create two sets of armor to protect Finn and Jake from Flame Princess.
- Lethal Chef: NEPTR can make poison pies.
- Like a Son to Me: Both Finn and the Ice King describe him this way, though both tend to forget his existence for long stretches of time.
- Magitek: Made from household junk and powered by the Ice King's frozen lightning. Fans theorize that this also explains how he can apparently generate pies from nothing.
- The Pollyanna: Despite the way that everyone ignores or abuses him, he's almost unfailingly polite and cheerful, and usually tries to help people out.
- Robot Buddy: Well, he has the personality for it, but he's more a pariah than a buddy.NEPTR: Hey BMO, we should hang out more. We're both robots.
BMO: No, NEPTR. I am not like you. - Single-Issue Wonk: Deconstructed, as despite being a sentient machine once zapped to life, Finn only made him to throw pies at Jake as revenge for a single prank. As a result, he was promptly forgotten about for over a year, and he remains the unfavorite next to BMO once Finn and Jake find him. It's not until "Sad Face" that he eventually settles into a consistent role as BMO's companion.
- The Unfavorite: It's pretty obvious which robot "child" Finn and Jake care about more. Shown most explicitly in "Don't Look," when Finn uncontrollably turns people into how he subconsciously sees them. BMO becomes a cute child with angel wings; NEPTR becomes a normal, non-speaking microwave. (But at least Finn feels bad realizing that he thinks of him as an inanimate object?)
- "Well Done, Son" Guy: To The Ice King for much of "Mystery Dungeon".
Billy
Click here to see his younger self
Voiced by: Lou Ferrigno
A legendary hero and Finn and Jake's idol. He battled hundreds of famous villains, such as the Lich and the Fire Count (also a bear), but eventually believed that it was a waste of time, as new villains would rise up. He later took up a philosophy of nonviolent community activism, but returned to the hero fold after Finn convinced him that saving lives was worth it.
- Ascended to a Higher Plane of Existence: After Finn completes Billy's bucket list, Billy manifests in the stars and thanks Finn for allowing him to rest in peace.
- Actual Pacifist: In "His Hero", Billy claims to be this because he thinks using violence against evil is pointless and this is because more evil pops up.
- Arch-Enemy: The Lich, it seems, as well as the Fire Count, who was to Billy what the Ice King is to Finn.
- Barbarian Hero: Has the aesthetic of one at the very least, even in his old age. He even fulfills the "strong warrior vs evil sorceror" dynamic that is prevalent within this trope due to his battles with the Lich.
- Badass Normal: He has no magic or magical abilities to speak of, but he was such a badass he beat and sealed the Lich for anywhere from decades to centuries.
- Battle Couple: Was in one with Canyon.
- Bears Are Bad News: If his theme song is anything to go by, a giant, floating bear is a part of his more notable enemies, alongside an evil ocean, the Fire Count and the freakin' Lich.
- Beyond the Impossible: He somehow killed an entire ocean.
- Broken Ace: Poor Billy, time has not done him well.
- Cool Sword: "Nothung!" Its name even has relevance outside the show, as Nothung was another name for Gram, the legendary sword that the hero Sigurd uses to kill the dragon Fafnir in Norse mythology. Billy can also (wearing his gauntlet) summon Nothung to his hand.
- Demonic Possession: Courtesy of the Lich King himself in "The Lich".
- Dented Iron: How time affected the poor guy.
- Did You Just Punch Out Cthulhu?: The great nemeses he's defeated include an Evil Ocean, The Lich, and a bear.
- Famed In-Story: He can slay an evil ocean, save a damsel from an evil Fire Count and even cast down The Lich!note
- Family-Unfriendly Death: One of the most gruesome in the entire show. While the moment Lich kills Billy is offscreen via a Gory Discretion Shot, what the Lich does afterward brings the horror right into the audience's face: the Lich then wears his skin like a suit, having either flayed Billy offscreen, or possessed him then killed him from the inside-out. The Lich wears Billy's body for two more seasons even after the corpse starts to fall apart. Fionna and Cake goes even further, showcasing Billy's body in an advanced state of decay (although by Fiona & Cake the series isn't quite as concerned with being "family-friendly.).
- Foreshadowing: Everything heard in Billy's theme song foreshadows many of the experiences that Finn goes through later in the series such as fighting the Lich, becoming a hero of renown, and even encountering a Bear with dark motives during "In Your Footsteps".
- Greater-Scope Paragon: Billy was one of the main inspirations for Finn and Jake to become heroes.
- Handicapped Badass: The "Beginning of the End" comic has a time-echo of Billy reveal that his heroism had rendered him largely deaf, which he got past by reading lips.
- The Hero's Idol: For Finn and Jake; Billy's a legendary hero who inspired them to become heroes themselves.
- Heroic Build: Had this build in his youth.
- Hero of Another Story: Billy used to kick all sorts of butt until he retired, even including The Lich! Finn and Jake convince him to get back in the game.
- Irony: Spends many years retired alive and well, but not long after he gets back into the heroing business is when he's killed.
- Jade-Colored Glasses: Sees fighting evil as a pointless endeavor; there's just too much evil that keeps coming up. Finn and Jake pull them off with the help of a happy old lady they saved from evil.
- Killed Off for Real: As of the Season 4 finale he was murdered by the Lich and at the end of the next season he is "at peace".
- Large Ham: BILLY!!!!
- May–December Romance: He was in a relationship with the much younger-looking Canyon a few years before his appearance in the series. Although in flashbacks to when he was younger, Canyon looks exactly the same as she does in the present, implying she either ages much slower than him or not at all.
- Minor Major Character: He's THE Hero of Ooo, but is only alive for about one episode before he's killed off in his very next appearance.
- Nice Job Breaking It, Hero: He told Finn that his human father was alive in the Citadel. This resulted in Prismo being killed, Finn losing an arm (and realizing his dad is a massive jerk), and a bunch of cosmic criminals set free.
- Non-Standard Character Design: Has six fingers on each hand. He's also really big. (Justified in that he's a half-giant).
- Noodle Incident: It's never explained when or how Billy found out who Finn's dad was or where he was.
- Our Giants Are Bigger: He
may be a half-giant. What the other half might be is anyone's guess... - Power Fist: The Legendary Gauntlet of the Hero, which Billy used to punch out the Lich.
- Rebuilt Pedestal: Finn and Jake manage to help him back onto his feet.
- Restored My Faith in Humanity: How Finn managed to convince him to come out of retirement.
- Retired Badass: Throws in the heroism towel after noticing that no matter how many times evil was defeated, they'd eventually come back for more. He hasn't lost his touch as he was shown to defeat enemies easily in a flashback with Finn.
- Small Role, Big Impact: He's only alive for a single episode, but his legacy sets the path for Finn and Jake to become the heroes they are in the series.
- Took A Level In Cynicism: At some point in the past, he retired from heroism because the forces of evil wouldn't back down no matter how much they were deterred. Finn and Jake convince him to return.
- Villain Forgot to Level Grind: Inverted, as while The Lich is too smart to be taken out the same way twice, as demonstrated when he circumvents Finn's usage of Billy's own gauntlet, Billy didn't grow in strength enough since his last duel with The Lich to stop the latter from killing him and using his skin as a disguise. Justified as Billy was retired for an unknown period of time and The Lich's return wasn't expected.
- Walking Shirtless Scene: He's never seen wearing a shirt either as a youth or an old man.
- We Hardly Knew Ye: He only appears in two episodes, at least the real him. Otherwise, he appears as either a dream or as The Lich's vessel. More focus is put onto what he's done for Ooo and its people.
- World's Best Warrior: He is toted as the greatest hero Ooo has ever known, with his feats inspiring Jake and Finn to become heroes themselves. He is eventually surpassed by Finn and Jake themselves.
- The World Is Always Doomed: He gave up heroism because there was always more evil threatening the world and by the time he saved one person someone else would attack them.
Huntress Wizard
"I uh... I worry that hard meat don't get eat"
Voiced by: Maria Bamford ("Reign of Gunters"), Jenny Slate (From "Flute Spell" and onwards), Olivia Olson (in Finn and Jake Investigations)
A female warrior wizard who starts out living in Wizard City, but abandons it for a secluded life in nature.
- Action Girl: Of course. Why else would she have such a name? In her first appearance, she's facing off against other wizards in combat, and her first appearance as a real cast member has her helping Finn subdue a rampaging boar. Her Improbable Aiming Skills with energy arrows prove she's spent a lot of time practicing.
- Ambiguously Bi: In "Wizard Battle" she is the only female wizard not turned off by the fact that the prize was kissing Princess Bubblegum (although the creators stated that she probably stayed for the challenge alone, then again, she was cheering when the kiss was revealed as prize).
- Animal Motif:
- An elk. She rides one, wears antlers, lives in the woods, and is stoic and dignified.
- Once she starts dating Finn, she gives him an elk's heart, saying it has deep significance.
- Ascended Extra:
- From a background character with little personality to a fully fleshed character with focus on her own episode, a recurring character during the final season and Finn's third Love Interest.
- She became a playable character in Adventure Time Run, an Endless Running Game where most of the roster is composed of the main characters, some secondary characters (Lemongrab and FP) and the Gender Flip characters. Not bad for a minor character.
- Cernunnos: Huntress Wizard has tree branch antlers, leaf hair, nature-based magical abilities including transforming into a hawk, and her character generally has many references to Artemis/Diana, another deity of the hunt.
- Commitment Issues: Is afraid to fall in love because she fears showing vulnerability to another person will diminish her status as a Badass. Seems to have gotten over it as of "The Wild Hunt".Huntress Wizard (to Finn): You're an exceptional beast and you have great hair. But exceptional beings like us can't fall in love.
- Demoted to Extra: After three years since the finale, she finally makes a comeback in the Distant Lands special "Wizard City"... as a background character, only appearing for two seconds. It happens again in Adventure Time: Fionna and Cake despite Finn mentioning her a few times, she only appears in "Prismo The Wishmaster" when Prismo looks through Ooo for a few seconds. That said, her alternate counterparts are a bit more important, but not by too much being reserved to recurring side characters.
- Druid: She used to be one before getting involved in magic. She still has the power to shapeshift into a hawk.
- Elegant Classical Musician: A controlled and calm person whose romance with Finn starts with a flute duet.
- Forest Ranger: She has this vibe, using archery and forest magic.
- Friends with Benefits: A G-rated variation: her relationship with Finn is more on the casual/mutual side since both of them are afraid of entering a normal relationship and ruining everything in the progress.
- Green Thumb: She has leaf-like hair and can even transform into things like trees.
- Inconvenient Attraction: Considered her attraction to Finn to be one seeing as she didn't want to be vulnerable with others. Changes as of "The Wild Hunt".
- Involuntary Shapeshifting: She turns into a log when she sleeps. It's unclear if she does this deliberately, or is even aware that she does it.
- Kick Chick: Routinely kicks monsters in the face.
- Maybe Ever After: Her relationship with Finn is left open-ended after the finale, especially after "The Wild Hunt" and "Seventeen" established a relationship between the two.
- The status of their relationship in Distant Lands is a complete mystery, as the miniseries doesn't give any hints if they're still together or not.
- Fionna and Cake implies they're still together.
- Mind over Matter: Rather then carrying a bow, she controls her arrows via telekinesis.
- Nature Hero: Fights to protect the forest ecosystem.
- Nice Girl: She may be a stoic Huntress but she’s always polite to Finn and Jake and expresses concern about Finn’s guilt caused by killing Fern.
- Not Distracted by the Sexy: She's very good at maintaining direct eye contact with Finn... when he's bathing. She specifically mentions his (then exposed) hair as something she likes about him later though.
- Not So Above It All:
- In "Wheels" she appears in the background when Finn starts playing his flute, watching him from the bushes. "Exceptional beasts can't fall in love," yeah, right...
- Gives Finn an elk's heart on his birthday. The fact that she attended a party in the city at all also counts.
- Official Couple: With Finn. As seen in Fionna and Cake, it seems like many of Finn's counterparts are destined to be with a version of Huntress Wizard, the only exception being the Vampire World, as not only a version of Finn does not exist in that world, but also Huntress' human counterpart ends up dead.
- Out of Focus: In the Grand Finale. She has a few important scenes—taking out a Gumbaldian spy, surveilling the battlefield, caring for Fern during the final battle—but no lines.
- Power Born of Madness: Presumably, since Betty's research confirmed magic was born of madness and sadness and Huntress Wizard was explicitly one of her test subjects. However, neither of these things seem to affect her much.
- Promoted to Love Interest: From a minor background character to Finn's third and final Love Interest.
- Significant Green-Eyed Redhead: Not herself, but her counterparts in other universes, like Hunter in the Mundane World and Huntress in the Vampire World, have dark-red hair and green eyes.
- The Stoic: Deliberately acts as stoic as much as possible, because as she says, hard meat don't get eat.
- Vague Age: She doesn't visibly age or get any taller from the first time we see her (in Season 3) to the last (Season 10) despite a few years passing during that time. It's quite possible she either doesn't age or she simply ages very slowly compared to a human.
- Victory Is Boring: Her biggest fear is achieving everything she desires. Without any goal, she fears she will become complacent and stop improving, eventually stagnating completely. This also shapes her commitment issues. If she settles down into a happy and content life, she fears she will stop striving to become better. Per word of god, it seems she stays with Finn and overcomes this somehow. Though, knowing the both of them, they probably continued striving by continuing the adventuring lifestyle.
- Visual Pun: She literally sleeps like a log and gives Finn an elk's heart on his birthday, saying it had "deep significance".
Tiffany Oiler
Voiced by: Vincenzo Rauso (Season 1), Collin Dean (Season 5 & 6), Aryan Simhadri ("Together Again")
A goblin boy who used to be a member of Jake's old gang of criminals. He desperately wants to be friends with Jake again.
- Apologetic Attacker: He apologizes to Joshua and Margaret before having their home in the 45th Dead World destroyed.
- Arch-Enemy: He considers Finn to be his.
- Ax-Crazy: Finn can't even get Tiffany to stop trying to stab him long enough for them both to fight giant worms.
- The Bus Came Back: He's used for a one-off joke in "My Two Favorite People", and doesn't return again until "One Last Job", where he gets a much larger role.
- Crazy Jealous Guy: He wants to be Jake's best friend again, and he will let nothing stop him.
- Delusions of Eloquence: He makes a lot of long, flowery speeches, but they're entirely meaningless and he has to write them down on his arm so he doesn't forget the words.
- The Dragon: He acts as New Death's right-hand man in "Together Again".
- Enemy Mine: He and Finn have to work together in "Dentist".
- Evil Counterpart: To Finn, as Jake's old partner in crime. Tiffany has a percieved rivalry with Finn for Jake's affections, although he mostly gets over it by "Preboot". He's working under New Death in Together Again, but shares Finn's sentiments of missing Jake. Once adopted by Joshua and Margaret, he tells Finn that he's their favourite now.
- Gender-Blender Name: Tiffany is a goblin boy.
- Happily Adopted: Joshua and Margaret decide to adopt Tiffany, seeing that he isn't actually bad, he just needs proper parental figures.
- Ice-Cream Koan: He tends to make meaningless cryptic speeches.
- I'll Kill You!: He makes no secret of his murderous intentions towards Finn.
- Jabba Table Manners: Eats like this after losing his teeth.
- Murder the Hypotenuse: He plans to murder Finn so as to have Jake all to himself.
- Never Found the Body: He gets eaten by a giant worm in "Dentist", but it's implied that he's still alive. This is confirmed in "Preboot", when he shows up as a Cyborg; however, the episode ends with the ship he's on exploding. Finn nevertheless says to Jake that he's "probably" okay to spare Jake's feelings.
- In the ending montage of the series finale, there's a brief shot of an adult cyborg Tiffany wandering through a wasteland.
- Perma-Stubble: Played for Laughs, as his stubble is simply pubescent peach fuzz.
- The Rival: He sees himself as Finn's rival for Jake's friendship.
- Stalker Shrine: He has one of these devoted to Jake.
- The Tooth Hurts: He lost all of his teeth biting into the Baker's Shard.
- Vague Age: Looks and sounds about Finn's age and is a bit shorter than him, but apparently ran with Jake back when he was criminal, which is implied to have been a while ago.
- Vocal Dissonance: He's a conniving, murderous criminal with a penchant for villainous monologuing, but he has the voice of a little kid.
Choose Goose
Click here
to see him as of Fionna and Cake (SPOILERS)
to see him as of Fionna and Cake (SPOILERS)
Voiced by: Jeff Bennett
An anthropomorphized goose with an extremely wobbly neck and limbs who speaks mostly in rhyme and sells all kinds of adventuring gear. Choose Goose sometimes teases Finn to manipulate him into buying his wares, but is mostly on good terms with him and Jake.
- Face–Heel Turn: After drinking Cocconteppi's ichor in "Wizard City", Choose Goose survives and turns evil in the process by the time of his reappearance in "Simon Petrikov".
- Felony Misdemeanor: In "Together Again", he is revealed to have died and was sent to the 1st Dead World, or basically Hell. Apparently, rhyming is a crime worthy of eternal punishment. However, "Wizard City" depicts his "turning dark" after consuming dark ichor, so he may not be telling the whole truth.
- Foul Waterfowl: He's a goose who later turns villainous.
- Meek Townsman: As Choose Bruce. He won't get directly involved in Finn's fight with the Destiny Gang, but gives him a weapon to attach to his robotic arm.
- No Celebrities Were Harmed: His voice is based on famous actor/comedian Ed Wynn.
- Not Quite Dead: The Stinger of "Wizard City" reveals that he survived drinking Coconteppi's ichor and that it turned him evil in the process. He still rhymes though.
- Rhymes on a Dime: Not always, but usually.
- Small Role, Big Impact: While Choose Goose only appears sporadically throughout the franchise, he noticeably has a big impact on the story of the series. Many instances of this includes him giving Finn magic glasses to become smart and inadvertently causes Finn to lose his first sword, Scarlet, in the process, Finn and Jake not wanting to deal with him after Finn's demon blood sword is destroyed leads them to purchasing the Grass sword from Grassy Wizard instead, and Choose Goose surviving from drinking Cocconteppi's ichor leads him to becoming evil and being used by Simon in a spell to bring GOLBetty to him that leads to Fionna and Cake entering the Land of Ooo.
- Species Surname: Choose Goose.
- Sudden Sequel Death Syndrome: The last time we saw Choose Goose, he was affected by Coconteppi's ichor at the end of "Wizard City". Two years later in "Simon Petrikov" in Adventure Time Fionna And Cake, he turned into an evil looking goose, but he's quickly electrocuted to death after Simon uses him as a sacrifice to summon Golbetty to the Land of Ooo. In the next episode, it's revealed that he survived, but then actually died when Simon tried to summon Golbetty a second time.
- Sudden Sequel Heel Syndrome: While Choose Goose was an ally of Finn and Jake in the original series, he later turns evil in the "Distant Lands" sequel special "Wizard City" after surviving drinking Coccontepi's ichor and becomes fully evil by the time of the "Fionna and Cake" series.
Banana Man
Voiced by: "Weird Al" Yankovic
A... well, a Banana Man who is probably the best engineer in Ooo. According to an apparent "croak dream," he will be present at Jake's death, though the dream is later fulfilled and Banana Man actually saves Jake from his apparent death.
- Anthropomorphic Food: His name's Banana Man for crying out loud!
- Big Damn Heroes: He shows up just in time to save Finn and Jake from the depths of space in "The Comet".
- The Chew Toy: In his first appearance, Finn and Jake destroy his home and his rocket ship. In his second, he helps save the Candy Kingdom but gets arrested for public nudity (though it's implied that he also hooks up with a female Banana Guard).
- The Engineer: Helps Finn and Jake fix up an old truck.
- Gadgeteer Genius: He can build a functioning rocket ship, the technology for which was lost after the Great Mushroom War.
- I Just Want to Have Friends: He agrees to help out Finn and Jake just because he wants to hang out with them.
- Mr. Fixit: He can fix a truck that's been broken-down for over one thousand years.
- Nice Guy: He's even willing to forgive Finn and Jake for destroying his rocket.
Ancient Psychic Tandem War Elephant
Voiced by: Steve Agee
An ancient two-headed psychic war elephant.
- A Head at Each End: A head on the front and a head on the back.
- Big Damn Heroes: His coming thanks to Finn's wish saves Jake from dying of overexertion and brings back the two Hot Dog Knight that were killed.
- Blind Obedience: The APTWE needs a master to serve and be commanded by. He is deeply confused when Finn is weirded out by it.
- The Caretaker: He becomes this to Maja after knocking her into a coma.
- The Cavalry Arrives Late: In "Come Along With Me", he arrives at the battle scene just as Betty fuses with Golb and disintegrates its monsters.Ancient Psychic Tandem War Elephant: We heard there was a war.
- Desperately Looking for a Purpose in Life: After the events of "Something Big", once Finn sets him to make his own path.APTWE: Finn, Finn!Finn: Yo, what's up, APTWE?APTWE: What do I do now?Finn: Dude, I don't know... Probably not go back in the basement. You're so big'uns. You should be free, boy.APTWE: Free to do what? I need psychic commands.Finn: Can you help me dice tomatoes for this guac?APTWE:No.Finn:You see, man? I feel weird giving you orders. You just do your own thing. Realize your potential.APTWE:But this is what I am. A war machine who serves its master.Finn: No, man. You're more than that!-Whoops! I've seen into your brain, remember? You'll do great, just go for it. I believe in you, man. Oh ,word, thanks.APTWE: Maybe Darren was right... There's no place for my ancient ways...Finn: Don't think like that, dude! Come back and see us whenevs!
- Psychic Powers: He's a telepath and mainly communicates that way. This also allows him to read the minds of other living beings, up to and including the Sun. He IS capable of speaking with his mouths, as he does in "Come Along With Me".
- Put on a Bus: After his first appearance in "The Limit", he doesn't appear again until "Furniture & Meat".
- Special Person, Normal Name: His real name, as told by Darren, is Eli (pronounced as "Ellie")
- Time Abyss: It's been around for as long as Darren.
Bubble/Air
As Bubble.
Voiced by: LeVar Burton
Now we can be together forever, BMO. Every minute of every day. No more privacy, no more quiet, no more alone. Every room you ever go in, I'll already be there. Waiting. Forever and ever, until the end... of time.
A seemingly ordinary bubble who can talk, they become acquainted with BMO when they become lost in the forest, and the two end up fostering a lost child on their travels. When the two arrive at the Tree Fort, Bubble confesses that they're in love with BMO, and wants to marry them. BMO accepts, until Jake pops Bubble, leaving BMO a heartbroken wreck. That is, until Bubble finally remembers who they are: Air. They proceed to comfort BMO, saying that no matter where BMO is, they'll always be there waiting for BMO until the end of eternity. BMO is happy about this fact, and the two become eternal life partners from thereon out.
- Accidental Truth: When they and BMO come across the lost child, Bubble decides to name him Sparkle, while BMO wants to name him Ricky. Unbeknownst to Bubble, the child's name actually is Sparkle, as confirmed by the mother when she finds him.
- Ambiguous Situation: It's not exactly made clear how BMO is able to hear Air loud and clear, especially when Finn and Jake can't, nor is it made clear how they got trapped inside the bubble in the first place.
- Amnesiac Hero: Bubble admits to BMO that they have a very vivid picture of what their home is like, but can't remember where exactly it is, and it irks them. Following Jake popping Bubble, Air finally remembers that their home is Ooo's entire atmosphere.
- Disney Death: BMO thinks Bubble is dead when Jake pops them, made especially sadder when he and Finn think BMO is playing around and laugh at them. As it turns out, popping the bubble brought them back into their real form, Air.
- Fourth-Date Marriage: They propose to BMO as soon as they get back to the Tree Fort, and aren't even aware what marriage entails, but this is more pragmatic than anything, since Bubble knows they probably won't ever find their home, and has found a new home within being with BMO.
- Happily Married: Zigzagged. They propose marriage to BMO outside the Tree Fort, and BMO happily replies, "I do," but this becomes impossible following Bubble being popped. However, because Air now has the ability to be in every single room BMO is ever in, there's no need for marriage any longer, and the two happily become life partners for eternity.
- Love Confession: Bubble admits that they're in love with BMO once arriving at the Tree Fort and waiting on Jake.
- Non-Human Non-Binary: Bubble is... well, a bubble, and Air is oxygen found all throughout Ooo, and collectively, they're nonbinary.
- Parental Substitute: To the lost child alongside BMO, at least until the mother finds him.
- Stalker with a Crush: As Air, they have the ability to traverse any room in the entire world, and prioritize being in places BMO's at.
- Yandere: When becoming Air, they admit to BMO up front that they'll never leave BMO's side for the rest of their life, and won't ever let them have alone time as a result, because they love BMO that much. BMO's ecstatic about this.
Moe
Voiced by: Chuck McCann
The creator of all MOs. He created BMO as the companion for a son, but he never ended up even dating. He eventually sent BMO out into the world to explore and learn and even find his own family to take of, to "Be more."
- Ambiguously Jewish: A promotional comic for "The More You Moe, The Moe You Know" has him lighting a menorah before getting to work assembling BMO.
- Bus Crash: AMO claims to be Moe after going fully cybernetic, but he actually killed the real Moe.
- Cool Old Guy: We're talking about the guy who built BMO, and thousands more robots!
- Genius Cripple: Can't use his legs and requires his robots to carry him and for life support.
- The Mentor: Moe is a kindly father figure who tries to teach his creations life lessons and help them find their purpose.
- Nice Guy: Moe is almost endlessly kind and caring.
- Stock Foreign Name: His full name is Moseph "Moe" Maestro Giovanni.
- Transhuman: When asked by Finn if he was human, he answered "My skin is human," implying that he has survived since the Great Mushroom War as a Cyborg.
- Where Does He Get All Those Wonderful Toys?: For a lot of Ooo, Moe is the answer to this question. Much of the advanced technology still left in Ooo appears to run on Moe's systems, and in several cases Moe has been subtly hinted at being the source of other developments. For example, one flashback shows Moe with a blueprint of the Sleeping Fire Giants that are so important to the Fire Kingdom, and the flashback also includes one of the flame giants in the process of being built just outside Moe's office.
Canyon
Voiced by: Ako Castuera
Billy's ex-girlfriend who appears in the fifth-season finale "Billy's Bucket List" and the seventh-season episode "Mama Said".
- Amicable Exes: Implied, Despite being Billy’s Ex she still helped Finn finish Billy’s Bucket List and never really had anything bad to say about Billy (Aside from him giving up heroing), implying they still had a good friendship after they broke up or at least parted ways healthily.
- Action Girl: She was a partner in some of Billy's adventures.
- Battle Couple: This is pretty much how she described her relationship with Billy.
- Dowsing Device: In her second appearance, Canyon uses a divining rod to find her family's sacred spring.
- Giant Woman: She's as tall as Billy.
- Green-Skinned Space Babe: Well, green-ish. With pointed ears for extra alien-ness.
- Making a Splash: Upon finding her magic spring water, Canyon manipulates it as a weapon and then wears it as a scarf.
- Manic Pixie Dream Girl: The "pixie" part is debateable, given her size, but there are indications that she was this to Billy. And maybe, momentarily, for Finn.
- Mayfly–December Romance: In her flashbacks, Billy looks much younger, but Canyon hasn't visibly aged at all.
- Statuesque Stunner: She's 20 feet tall and gorgeous.
Breezy the Bee
Click here to see her humanoid form
Voiced by: Ashly Burch
A Female Bee that Finn meets after his final confrontation with The Lich. At first, she only seems interested in the flower growing from his armless stump — being Finn's friend and getting him princess kisses to re-ignite his "spark" and keep the flower from wilting — only to get closer to it rather than him. After some bonding, she grows to love Finn. (Enough to drink royal jelly and become a Queen Bee to protect him from other bees.)
- The Bus Came Back: She eventually makes an appearance in the short "Frog Seasons, Spring (Again)".
- Foil: To Princess Bubblegum. Breezy, being a queen bee who loves Finn and needs a knight, contrasts PB being eternally a princess with no plans to marry and become a queen, and not returning Finn's affection. Breezy is literally everything Finn ever wanted from PB but cannot receive, and dialing up the irony is the fact that this time, it's Finn who doesn't return the affection. Lampshaded via symbolism when Finn sees her silhouette near the end of her episode, and he mistakes her for Bubblegum for a moment.
- Interspecies Romance: Though it doesn't start off as such, it begins with Breezy simply wanting the flower that came out of Finn's arm stump at the Citadel. Through the episode, the friendship blooms into her feeling affection to Finn, rather than the flower. Though she is just a bee, she becomes a more humanoid Queen after stealing royal jelly to protect Finn. However after that, Finn still sees her as just a friend and she seemingly leaves. After that, she returns after Finn's attempts making out with LSP fail to keep the flower from wilting, and her singing seemingly sparks enough passion to make the flower literally explode into a tree and give Finn's arm back. This seems to spark his interest in her, but only time will tell if this goes anywhere.
- Jerk with a Heart of Gold: Only wants to help Finn to keep the flower alive, but grows out it as she spends more time with Finn.
- The Power of Love: She returns to Finn after she leaves him for saying that he thinks they should just be friends and spends the night with LSP. The two perform a duet which makes the flower blossom until it explodes and returns Finn's arm. Bonus points in Finn that he sees PB during the song and realizes it's Breezy afterward, with an awed expression.
- Psychic Powers: In her Queen Bee form, though it isn't certain whether this only extends to other bees or not.
- Rebellious Princess: To get Finn to continue being responsible for the flower, she eventually tells Finn that she's a Virgin Queen Bee, running from her responsibilities. She eventually gets over this for Finn's sake.
- Romantic Wingman: What she becomes to Finn after they first meet.
- Transformation Sequence: Goes through a somewhat unsettling one to rescue Finn out of love, becoming a humanoid bee creature. To be specific, she vomits honey which wraps around her, making her grow and form her humanoid appearance.
- Walking Spoiler: Wouldn't expect that out of a simple bee, would you?
The Grass Sword/Fern (SPOILERS)
Click here
to see the original Grass Sword
to see the original Grass Sword
Click here
to see the Green Knight
to see the Green Knight
Voiced by: Hayden Ezzy (as Fern), Brad Neely (as the Green Knight)
A cursed sword made of grass provided to Finn by the Grassy Wizard. It cannot be removed, but becomes controllable once Finn accepts it as his weapon. As of Season 7 episode "Reboot", it detaches itself from Finn and merges with the Finn Sword, becoming its own person.
- Absurdly Sharp Blade: Sharp enough to slice through metal, and incredibly precise.
- Adaptive Ability: It reacts to Finn's intense desire to not let his father escape in "Escape from the Citadel", taking over his whole arm, swelling up enormously, and giving him enough strength to restrain an asteroid from taking off. Unfortunately, the force of the asteroid's departure was so great that it ripped Finn's arm off; even then, the grass sword somehow made it so that the stump was completely healed over at the moment his arm was ripped off.
- Alternate Self: Fern is a hybrid of the Grass Sword and the version of Finn that became a sword via time paradox.
- Alas, Poor Villain: Despite being a massive jerk on numerous occasions, he eventually dies sympathetically.
- Always Second Best: Fern's insecurities make him feel this way about Finn.
- Ambiguously Evil: Though it did at one early point attempt to overwhelm Finn, the majority of the time it seems to act in his interest even when acting without his permission. Fern, on the other hand, is like Flame Princess in that, while violent, he's not completely evil. By "Whispers," he's decided he wants to replace Finn, but his goals from there aren't addressed. After "Three Buckets," this trope is averted for Fern as he has now become Gumbald's willing minion, before pulling a Heel–Face Turn upon sorting things out with Finn, although the curse itself remains ambiguous as its motives are not addressed.
- Ascend to a Higher Plane of Existence: Is reborn as a gigantic tree that watches over Ooo, with the Finn sword in its branches for a future hero to find.
- Audible Sharpness: Rings like a bell when swung.
- Body Horror: After Gumbald modifies his body and turns him into the Green Knight, his body becomes a darker shade of green, grows thorns on his limbs and head, becomes much larger and his head has holes scattered around his face.
- Came Back Strong: As the Green Knight.
- Combat Tentacles: Can sprout these from his armor as the Green Knight.
- Cool Sword: A tachi made of grass that's supernaturally sharp and deft.
- Clothes Make the Superman: It's a curse yet it actually gives Finn enough skill to cut through almost anything, enough to fend off Bandit Princess, who was in possession of the Finn sword that doubles the strength of the user.
- Cursed with Awesome: A parody of it. The sword was meant to be an actual curse to the user who finds it unwieldy and fears it. Guess what happens next.
- Demonic Possession: A far more subtle and insidious case than most examples of this trope. When the Grass Sword merges with the Finn Sword to create Fern, the grass 'Curse' entity is able to entwine itself with the Alternate Finn. From then on, the Grass Entity is constantly influencing Fern, and is most likely responsible for his Green-Eyed Monster, Kill and Replace and Failure Hero tendencies.
- The Dragon: To Gumbald.
- Emergency Weapon: Becomes the available second after the existence of the Finn sword, in case the Finn sword gets either stolen or broken.
- Empathic Weapon: It responds to Finn's will, retracting to wrap around his arm when not in use. It also seems to possess some concern for Finn's safety, slapping him awake when he's unconscious in the ocean. It also destroys the Fear Feaster as he antagonizes Finn.
- Evil Is Bigger: After becoming the Green Knight Fern becomes MUCH taller, becoming several heads taller than Finn.
- Evil Weapon: Implicitly, but Finn manages to keep it under his control. Played straight when Fern does a Face–Heel Turn.
- Face–Heel Turn: After so many failures as a hero, he snaps and attempts to pull a Kill and Replace on Finn.
- Failure Hero: Blames himself after failing to protect Ooo from the elemental curse and not being able to help stop the Lich's Hand plan during "Whispers". This results in... well, see the trope above.
- Faux Affably Evil: When the Grass Demon actually speaks, it's a relaxed, calm voice that never raises to a loud volume. It's very insistent on telling Sword Finn to relax while he's wrapped up in a cocoon and loses control of his body. Though "evil" might be a stretch as it is never really elaborated what the Grass Demon's goals are.
- Fusion Dance: Fern is the result of the Grass Sword and Finn Sword, itself a past version of Finn, merging into a single being. The result is someone with Finn's memories, the Grass Sword's abilities and mix of both in personality.
- Green Thumb: Gains the power to create plants after becoming the Green Knight.
- Green-Eyed Monster: Literally and figuratively. His envy and hatred towards Finn is the reason he wants the boy dead, just so he can prove that he's a better Finn than him.
- Heel–Face Revolving Door: Starts out as a cursed sword that threatens Finn. Becomes a part of Finn that saves him several times, then transforms into Fern, who is vicious but friendly for a while, but then betrays Finn out of jealousy. Then he gets killed, and reborn as the Green Knight, before finally helping Finn kill the Grass Demon and redeeming himself just in time to die (deep breath).
- Kill and Replace/There Can Be Only One: His goal is to be the only Finn on Ooo.
- Living Weapon: Definitely alive, and possessing some level of sapience.
- Ludicrous Mêlée Accuracy: Remarkably agile and the blade itself is flexible. It tends to carve solid objects into busts of Finn's head that themselves fall into separate pieces (i.e. the face and eyeholes slide out).
- Mid-Season Upgrade:
- The sword itself has shown much more spotlight than any of the swords that Finn had in the entirety of the show and it proves more than enough to consider its keep on Finn. In the end of "Reboot", it detaches itself from Finn and taking his arm with it while protecting him from a rogue Susan Strong, merges with the Finn Sword and becomes Fern.
- This happens again when Gumbald turns Fern into the Green Knight, allowing him to overpower Finn during the arm wrestling match in "Seventeen." It happens again in "Come Along With Me", where he is reborn as a replacement for Finn and Jake's Willow tree.
- Not-So-Harmless Villain: The actual 'curse' within the sword starts out entirely benign, only serving to stick to Finn and nothing else, even becoming beneficial after it grows a new arm for Finn. However, after merging with the Finn Sword to create Fern, the Grass Demon is able to directly influence Finn's Alternate Self, becoming far more dangerous in the process.
- Only Mostly Dead:
- In the season six premiere, it's reduced to a flower on Finn's arm. A few episodes later, it regrows Finn's arm and is reduced to a thorn in the process. In the season finale, it grows back again, fusing with his regrown arm.
- This happens once again when Finn accidentally kills Fern in "Three Buckets."
- Paradox Person: Fern's main consciousness is the Finn Sword, who was the result of Finn encountering his past self while trying to revive Prismo. In essence, Fern is effectively Finn's past self who ended up turning into a sword before merging with the Grass Sword.
- Redemption Equals Death: His final fate.
- Sense Loss Sadness: Fern lacks human anatomy and therefore cannot consume regular foods or produce air needed to play instruments like the flute. Frustration over this later contributes to his growing descent into villainy.
- Slasher Smile: He wears one when he attempts to kill Finn in "Three Buckets" and later as the Green Knight in "Seventeen".
- Stealth Pun: Hardly "stealth" since it's the name of its introductory episode, but it's literally a blade of grass.
- Talk to the Fist: Or blade, rather. It manages to slice through the Fear Feaster, much to his surprise, possibly without Finn commanding it to.
- Tragic Hero: A textbook of this trope. As someone who began to be a hero, his depression grew progressively and he blamed himself after failing to protect Ooo from the elemental curse. His subsequent redemption and death in the Grand Finale makes his whole storyline even more tragic.
- Took a Level in Badass: Goes from Finn's sentient grass sword to a grass human born from a Fusion Dance between the Finn sword and the Grass sword to becoming The Dragon to Gumbald as the Green Knight.
- Villain Team-Up: He teams up with other villains in order to kill Finn and take down the Candy Kingdom.
- Walking Spoiler: Its very existence on Finn's arm already concludes the (possible) final fate of Finn's missing limb conundrum. This also applies to Fern's entire existence as well as Fern's transformation into the Green Knight.
- World Tree: Is reborn as a gigantic sacred fern tree in the finale after forgiving Finn.
- Your Days Are Numbered: After he kills the grass demon, his body starts to deteriorate. Justified since the grass demon was a part of him since his existence. He finally falls apart and reverts to a Finn Sword-shaped seed after GOLBetty leaves Ooo.
Elsewhere on Ooo
The Snail
Voiced by: Pendleton Ward
A snail who can be seen waving at the audience in every episode.* His only notable role in any episode was being mind-controlled by the Lich into releasing it.
- Chekhov's Gunman: While he spends the entirety of the series as a background character in every episode, the Snail ends up being used by the Lich to free him from his prison.
- Demonic Possession: He spends two whole seasons being possessed by The Lich. He was finally released when The Lich chose to Body Surf into Billy.
- Demoted to Extra: He was always just an extra in the series, but as soon as the Lich leaves his body for Billy's in "The Lich", his importance in the plot completely evaporates.
- Evil Sounds Deep: At the end of "In Your Footsteps" the possessed snails speaks in a deep voice.
- Freeze-Frame Bonus: Once an Episode, he can be seen in the background waving.
- Living Prop: Besides that one time the Lich possessed him.
- Nice Job Breaking It, Hero: Releasing the Lich.
- Once an Episode: Because of this, he's actually appeared in more episodes than Princess Bubblegum, Ice King, or even Finn.
- O.O.C. Is Serious Business: He usually waves in every episode to the viewer, regardless of being possessed or not. When he shows up in "Gumbaldia", he simply watches Bubblegum screams in anger at Gumbald before declaring war against him and his city, showing that things will get serious during the finale.
- Orwellian Retcon: He was not originally in two episodes: "Trouble in Lumpy Space" and "Blood Under the Skin". But then he was later added in to both episodes before reruns aired.
- Put on a Bus: The creators confirmed that he wouldn't return in the "Distant Lands" miniseries besides a hallucination of his skeleton and a memory of him possessed by the Lich. Similarly, he doesn't appear throughout the "Fionna and Cake" miniseries until the last episode where he appears in a Freeze-Frame Bonus in one of the universes that Simon steps on after GOLBetty sends him off.
- Small Role, Big Impact: He isn't anything other than a Living Prop, but the Lich never would have been freed from his prison to begin with had he not possessed the snail; who would change the tone of the show forever.
- Unwitting Instigator of Doom: Was the reason the Lich was able to escape in the first place; he happened to hitch a ride in Finn's backpack when Finn and Jake were taken by Princess Bubblegum to the tree where the Lich was imprisoned. As soon as he crawled out, the snail was then possessed by the Lich into shattering the prison of amber and freeing him.
Shelby
Voiced by: Pendleton Ward
Shelby is a talking worm who lives in Jake's viola.
- Accidental Misnaming: He objects to being called "Shelby the worm who lives in Jake's viola".Shelby: You can just call me Shelby.
- Character Catchphrase: After learning the phrase from Jake's abuse of it for the sake of comedy in "Video Makers", Shelby adopts "Check, Please!" as one which also ends up being his final line in "Come Along With Me".
- Creator Cameo: He's voiced by Pendleton Ward.
- Deadpan SnarkerFinn: Who in this world is sadder than the Ice King?Shelby: Me, watching this.
- Jerk with a Heart of Gold: Shelby is insulting, willing to manipulate others to avoid having to do work and once screwed over Finn and Jake to get his girlfriend a pony. But he's not a bad person by any means.
- Talking Animal: He's a talking worm.
Susan Strong
Voiced by: Jackie Buscarino
A member of an underground-dwelling group of humans. The "humans" she lives with are eventually revealed to be hyoo-mans, a strange race of Fish People living in the ruins of human civilization. Susan herself is the only true human amongst them. She gets a focus arc in season 8 explaining her origins. Her real name is Kara, and she was an elite member of humanity's "Seeker" caste who was sent to Ooo 16 years ago to find Martin and baby Finn and bring them home, but somehow ended up getting lost herself.
- Ambiguously Gay: She has an extremely close relationship with Frieda in the Islands mini-series.
- Ambiguously Human: She is fully human, though she does have some cybernetic implants from her home.
- Connected All Along: Not only is Susan the one who introduced Finn's parents to each other, but she is the Seeker tasked with finding Martin and Finn when they disappear, which eventually leads her to become amnesiac.
- Cowardly Lion: Better than the rest of her people, certainly.
- Deuteragonist: Of the Islands Miniseries, her backstory and true identity as Kara is the main focus of the plot alongside Finn looking for his Mom.
- Expy/Shout-Out: Of Tarzan, much like Finn. In Susan's case it's a lot more obvious, since she's Raised by Wolves that don't act civilized but live as a group which she leads, and she doesn't speak fluent English.
- Huge Schoolgirl: Big in every way. There is pretty much no physical indication of youth, leading to her Vague Age. Played straight(er) in the "Islands" flashbacks: Susan was already extremely muscular as a young teen thanks to her Seeker training — however this had very little impact on her social life (since this was perfectly normal for Seekers), and actually had a positive effect on her self-image because she loved being buff.
- Inconsistent Spelling: The hyphenation of her serial number is different in each of its appearances — when first shown on her cranial implant it reads "X-J-7-7", then "XJ-77" when displayed on a computer monitor, and finally as "XJ-7-7" when shown on BMO's face.
- Phlebotinum Rebel: Susan was trained and cybernetically augmented by Doctor Gross into being her most powerful Seeker, and ultimately plays a key role in defeating her.
- Right for the Wrong Reasons: It turns out Strong really is her surname. All humans from the Mysterious Islands are given a designation comprised of a serial number combined with their last name: Finn's is P-G-8-7 "Mertens" and hers is X-J-7-7 "Strong."
- Small Role, Big Impact: Susan was the one who "introduced" Finn's parents to each other — she broke both of Martin's legs during a Seeker mission and dropped him off at the hospital where Minerva worked.Minerva: What've you got for me, Kara?Susan: A sad old hider with two busted legs.Minerva: Oooh, I love busted legs!
- Sweet Tooth: She, along with the rest of her tribe, actually tries to eat the entire Candy Kingdom.
- Took a Level in Badass: In her second appearance she's the leader of the Hyoo-mans in all but name, conquers some major fears, and is generally a ferocious warrior. Zig-zagged — she was actually regaining levels of badassery that she had lost when she lost her memories.
- The Unreveal:
- In her debut episode, we never find out if she's a fish person like the others, or a real human. At the end of "Beautopia", after she gently moves Finn's hand beneath her hat, we don't get to see whether or not there's a set of gills there or a human ear. Finn's reaction and Susan's Character Development imply that she is human.
- The question finally gets a conclusion that only opens up more questions in "Dark Purple": she IS a human, but also has a cybernetic implant.
- These questions all get answered during the "Islands" mini-series, but bring up yet more questions. Namely, it's never explained how Susan lost her memories or ended up living with the Hyoo-mans.
- Vague Age: She and Finn have more than a little chemistry, and Hulk Speak and Naïve Newcomer aside they seem to be on the same intellectual level. However, Susan's body type is very much that of an adult woman. The season 8 mini-series shows that she is at least 15-20 years older then Finn, as she knew his parents before he was born and was sent to retrieve him when he was an infant. When she and Frieda return in "Prismo the Wishmaster" set 12 years after "Come Along With Me", they both look exactly the same.
- You No Take Candle: When Finn and Jake first find her, she barely knows how to speak until the two heroes teach her and she steps up to this trope. She's getting better at speaking though, as seen in "Beautopia". When she regains her memories, she speaks perfect English again.
Morty Rogers
Voiced by: Ron Livingston
A traveling puppeteer, who it turns out isn't really using puppets, but a couple of imps who have possessed his ears.
- The Barnum: He's not looking for customers to scam money out of, but rather, an unwitting patsy to pass off his curse to via moon ritual.
- My God, What Have I Done?: He realizes how much he misses Chips and Ice Cream after being free of them for a day and running into them. He tries to secretly redo the ritual from outside the window of Finn and Jake's house, except that it was all a Batman Gambit on BMO's part to free the two imps.
James Baxter
Voiced by: James Baxter
A talented horse who can only say his own name and travels by balancing on a beach ball. He uses his ball-balancing act to spread joy throughout the land.
- Animation Bump: James Baxter moves more fluidly than the other characters, courtesy of guest animator James Baxter.
- Creator Cameo: James Baxter is the name of a renowned Disney and DreamWorks animator (most notably, he was the principal character animator for Ariel in The Little Mermaid and Belle in Beauty and the Beast), who also does the character's animation and voice.
- Fun Personified: He spends his time performing for other people (read: running around balancing on top of an inflatable ball), taking their worries away. Deconstructed in "Horse and Ball" when his ball pops, and he becomes depressed because he feels he no longer has a purpose without it. He then realizes that he has spent so much time making others happy he had no time to make himself happy. When Jake recovers a whole bunch of balls for him, he rejects them and instead dances for the pure joy of it.
- Heroic BSoD: Undergoes one in "Horse and Ball" after his ball pops.
- Line-of-Sight Name: A flashback shows that he came up with his name when he saw a box labeled "Games" and a sign reading "Bookstore", then mispronouncing both of them as "James Baxter".
- Partially Civilized Animal: He comes from a city of horses that act almost like humans, but are still very much horses.
- Pokémon Speak: All he can say is his own name.
Island Lady
Voiced by: Riki Lindhome
A living island that the Ice King washes up on. They soon become fast friends. She also dates the Party God, who often ignores her.
- Ambiguously Brown: Might be Latina, judging by the lyrics to her song.
- Genius Loci: She's a living island.
- Nice Girl: Given she provides a place for Ice King to stay and sings for him.
- Platonic Life-Partners: While the Ice King lives with her. One of his few genuine friendships.
- Weak-Willed: She can't bring herself to break up with the Party God even though she really wants him gone.
- You Are Better Than You Think You Are: The Ice King constantly encourages her to voice her feelings and break up with the Party God as she wishes to do. At the end of the episode, he also says that she was an inspiration to him as well.
The Water Nymphs
Voiced by: Hynden Walch, Niki Yang, and Katie Crown
Three water nymphs who can be found hanging out in any body of water. They’re very friendly, but terrible at telling jokes.
- Elemental Hair Composition: Their "hair" is actually falling water.
- Malaproper: They try to make a lot of jokes, but they never come out quite rightNymph: What did the mermaid see a movie?
- Ms. Fanservice: They're attractive girls who only ever wear two-piece bikinis.
- Walking Swimsuit Scene: They’re always wearing bikinis.
Johnnie
Voiced by: Mark Proksch
A Lumpy Space Person who becomes LSP's boyfriend. Ends up being teleported to an unknown dimension because of LSP recklessly sticking him in Bubblegum's time machine.
- He Cleans Up Nicely: Once he straightens up, he's apparently good-looking. By Lumpy standards.
- He Is All Grown Up: LSP used to call him "Ugly Johnnie" back in high school, but finds him attractive as an adult.
- Nice Guy: He's a very decent person.
Erin
Voiced by: Minty Lewis
A female caterpillar from the episode "Food Chain." Finn and Jake meet her during the heat wave they struggle to live through when they are caterpillars.
- Fourth-Date Marriage: Caterpillar!Finn decides to marry Erin a very short time after meeting her.
- Love at First Sight: As soon as Finn sees her, he instantly falls in love.
-
One-Scene Wonder: She only appears in the caterpillar segment of the whole episode, throughout which she travels with caterpillar!Finn and Jake before accepting Finn's Marriage proposal. Her last scene involves her declaring that she will meet Finn again in a new life. The scene then cuts back to Human!Finn back at the exhibition building along with Jake. - Tertiary Sexual Characteristics: She's a pink and magenta-striped caterpillar with a large bow on her head.
Phlannel Boxingday
Voiced by: Creed Bratton
A monster hunter who rides a cloud around the sky. He rescues Lemonhope from the desert and later inspires him to free the Lemon Children. Might be a bubblegum man, and implied to have a connection to Princess Bubblegum, with the same initials, an instance of Techno Babble and fluency in German, and being bound by the same pacts and treaties that prevent Bubblegum from interfering with Castle Lemongrab. It's also very heavily implied that he is actually Bubblegum in disguise.
- Cool Old Guy: Flies around in a cloud-cart, killing treasure-eating monsters for their treasure and harvesting black diamonds for love potions.
- Foil: To Princess Bubblegum. She raises Lemonhope under the strict belief that he is required to free the lemon people and take over as ruler while Phlannel encourages him to do what he wants and live as a free spirit.
- Order Versus Chaos: He offers to Lemonhope the life of a chaotic free spirit in contrast to Princess Bubblegum's forcing him to become a martyr for his people.
- Red Oni, Blue Oni: A passionate wanderer who values freedom above all else compared to the strict and pragmatic Princess Bubblegum who believes the safety of the people outweighs the happiness of the people.
- Theme Initials: Compare "Phlannel Boxingday" with "Princess Bubblegum".
Peace Master
Voiced by: Rainn Wilson
A man who hunts monsters and is very paranoid about dark magic.
- Arch-Enemy: To Peppermint Butler.
- Bag of Holding: His hat is a portal to a flesh-destroying void dimension. It very nearly gets rid of Peppermint Butler.
- The Bus Came Back: Returns in the final season as part of Gumbald's army.
- Butt-Monkey: When it comes to his own children, he really has it rough. Taken to unfunny levels once he loses to Peppermint Butler, and is still being hunted as a felon by Princess Bubblegum.
- Properly Paranoid: Very aware that Peppermint Butler is extremely dangerous despite his servitude to Princess Bubblegum. He pays dearly for it.
- Signature Headgear: Just look at that thing! It's even a Bag of Holding.
- Tragic Hero: Er, anti-hero at least. He wants to be rid of Peppermint Butler, and not only does he lose horribly, he's humiliated and reduced to tears despite his best efforts.
- Villain Team-Up: While not a villain per se, he ends up joining forces with Gumbald and the other villains.
Chips and Ice Cream
Voiced by: Kate Micucci (Chips) and Riki Lindhome (Ice Cream)
Two imps who possessed the head of Morty Rogers, and are part of his puppet show.
- Curse: They possess the ears of those cursed. The only known way to undo the curse is to pass it on via moonlight ritual in the presence of the intended target.
- Curse Escape Clause: Intercepting the imps while in the transportation phase of the ritual and capturing them in a container, then setting them free.
- Humble Goal: As hinted by the play and revealed in the end, to be free and encounter a bird.
- I Just Want to Be Free: They both want to roam free.
- Pokémon Speak: They communicate purely via intonation, only being able to say their own names.
Blank-Eyed Girls
A group of mysterious children with black eyes.
- Creepy Child: Based on the Black-Eyed Children urban legend.
- Must Be Invited: Starchy claims they have to be, but he turns out to be wrong (again).
- Starfish Aliens: They turn out to be star-shaped ghost... things that dissolve into dandelion seeds. Yeah.
Pudding Troll
Voiced by: Steve Berg
A troll made out of pudding who guards the now-abandoned Ble headquarters.
- All Trolls Are Different: A sentient being made out of pudding with a second face in its stomach. Pretty much the only thing it has in common with any other depiction of trolls is that it lives under a bridge.
- Gate Guardian: Only when Finn and Ice King defeat him in combat does he allow them to enter the Ble headquarters.
Mr. Fox
"You can't just buy that depression. You gotta earn it."
Voiced by: Tom Herpich
A fox who lives in the forest of Ooo, a Recurring Extra, and the new new Death.
- Accidental Hero: He accidentally murdered New Death, who was possessed by The Lich, which ultimately saves all the souls in the Death World. As bonus, he becomes the new, new Death.
- Accidental Murder: He accidentally kills New Death by aiming the Kiss of Life on the right end.
- A Form You Are Comfortable With: He reveals to Finn that this is the reason he still perceives him and himself as if they were still alive. He shows it by splitting the skin of his face and revealing his skull.
- Alas, Poor Yorick: By Shermy and Beth's time, BMO keeps the skull of Mr. Fox in his house. When Beth grabs it and accidentally drops it on the floor, BMO nearly kicks them out.
- All of the Other Reindeer: To the point he's actually called "The Loneliest Guy on Ooo".
- Ascended Extra: He takes on more importance than he ever did in the show proper in Together Again, acting as Finn's guide to the Dead Worlds and acting as the Lancer to Finn. He disappears in the second third, returning in the end to kill New Death and become Mr. Death.
- Butt-Monkey: Being as he's the only normal guy in Ooo, he's constantly subject to misfortune, which can range anywhere from having his house torn apart to being forced to kiss a goose.
- Characterization Marches On: He was initially depicted as an occasionally villainous wild animal, before settling into being The Everyman.
- Eats Babies: In "Jake the Dad", he tried to do this after being convinced by a children's book that they're just some kind of animal that lets foxes eat them.
- The Everyman: He's an average, everyday fox whose sole purpose is to be a Recurring Extra in the series and to bounce off the over-the-top personalities of everyone else in Ooo.
- Everyone Calls Him "Barkeep": It is unknown if he has a name or not but everyone calls him, "Mr. Fox".
- The Good King: His brief time at the end of "Together Again" showing him as the new New Death ("Mr. Death") already establishes him as a benevolent ruler who quickly restores the Dead Worlds and gives everyone their own hypoallergenic pillow, before kindly granting Finn's request to go back. And then allowing Jake to quickly follow after, even when their official agreement was that he'd ascend back to the 50th Dead World.
- Heel–Face Revolving Door: Whether or not he's the villain or just some random bystander depends on the episode.
- Nice Guy: He's generally shown to be a polite, if rather awkward guy.
- Ridiculously Average Guy: You have no idea how average he is in the series. Unlike everyone else in Ooo, he's just an awkward and depressed, but normal guy.
- Running Gag: People breaking into his house.
- Throw the Dog a Bone: After all of his torment of being the resident Butt-Monkey he becomes new new death a position where he not only has a proper purpose, is respected, gets the pillow he wanted and seems more genuinely happy than he was in life.
- Walking Spoiler: In "Together Again" Mr. Fox becomes the new, new Death after killing the New Death.
- What the Hell, Hero?: In "Together Again", he calls out Finn and Jake when he witnesses the aftermath of their fight, in which they beat each other down over the Kiss of Life.Mr. Fox: You're fighting over... a stick? You're brothers! You're a team!
Comic Characters
Penelope
An adventurer and future reincarnation of Finn who appears in the main Adventure Time comic series.
- Action Girl: She is an adventurer like her past life, Finn.
- Mythology Gag: Her name can be shortened to Pen, Finn's name in the Random! Cartoons pilot.
Gata
A girl resembling a humanoid octopus who just showed up at the treehouse one day, acting like she's known Finn and Jake their whole lives. Which is true, she's actually their sister who was recently un-Ret-Goned.
- Anti Anti Christ: Her mother is a Demon Queen, and she's as much of a hero as her brothers are.
- Gadgeteer Genius: She gave BMO a Giant Robot Form, and a nuclear power station to power it.
- Hellgate: When she sleeps, her mouth is a portal to a realm of Thought Demons.
- Heroic Sacrifice: She re-RetGones herself at the end of the storyline to keep the Demon Queen from attacking Ooo.
- The Nicknamer: She gave an overly complicated nickname to Marceline. Whether or not others have similarly complicated nicknames is unknown.
- Ret-Gone: Joshua used some goop to do this to her, believing the only way to protect his family from the Thought Demons coming from her mouth was to remove her from the universe, leaving a statue in her place.
- Sealed Good in a Can / Sealed Evil in a Can: When she was removed from the universe, the only thing that remained was a statue. When Finn and Jake broke it, Gata came back. And the Thought Demons too.
Past and Future of Ooo
Past Characters
Betty Grof
Voiced by: Lena Dunham (Season 5-8), Tom Herpich ("King's Ransom"), Felicia Day (Season 9 and onwards)
The fiancée of Simon Petrikov, aka the Ice King. She lived on Earth before the apocalypse until Time Travel brought her to the present day Land of Ooo.
- Action Girl: One of the first things she does upon arriving in Ooo is punch out Bella Noche, the embodiment of anti-magic, with a singular punch.
- Ascended Extra: For the first half of the show's run she was just a part of Simon's backstory, usually only being referenced on occasion or seen in what were essentially cameos. In the last seasons, however, she became an important part of the cast, especially as she became more reckless about using powerful forces to attempt to save Simon...
- Big Bad Ensemble: With Princess Bubblegum and Patience St. Pim in the Elements miniseries.
- But Now I Must Go:
- After restoring the powers of the ice crown to keep Simon alive, she decides to leave the Ice King until she is able to find a way to safely free him.
- She does this again in the finale when she becomes the new GOLB and banishes herself from the planet to protect Simon and everyone else.
- At the end of Fionna and Cake, she and Simon accept their relationship is impossible and, after saying their goodbyes, the two part forever.
Simon: Where are you going!? - Covert Pervert: Downplayed, but upon jumping through the time portal to give Simon a Big Damn Kiss, she holds the kiss so long that she barely even notices that Simon's dying in her arms until he's nearly completely collapsed.
- Decomposite Character: A lot of her moves and mannerisms are the same as Fionna's. Ice King originally wrote Fionna as someone who has great affection for him, like Betty, possibly demonstrating his own unconscious longing for his fiancée.
- Determinator: A trait she shares with her fiancée.
- Fatal Flaw: Self-sacrifice. Unbeknownst to Simon, during their relationship, Betty was constantly giving up her dreams for him, even turning down a research trip at the last minute. After arriving in Ooo, Betty runs herself ragged trying turn Ice King back to normal, ignoring all warnings to stop, and culminating with her permanently fusing with GOLB in order to keep Simon safe.
- Fish out of Temporal Water: Though she seems to take it well.
- From Nobody to Nightmare: Over the course of the series she goes from being a normal human researcher to a powerful wizard, then later becomes the living embodiment of chaos who dispatches the Lich with merely a thought.
- Heroic Sacrifice: She uses the Crown's wish magic to become the new GOLB and banish herself and GOLB's monsters from Ooo.
- Hijacking Cthulhu: Using the reset of the wishing crown, she merges with GOLB and takes over his body.
- Ignored Epiphany: She is subjected to a Secret Test of Character by Normal Man to convince her to finally let go of Simon and focus on improving herself. However this backfires; despite briefly appearing to accept the theme that Normal Man was pushing, almost as soon as the test of character concludes, Betty just becomes more determined to save Simon.
- I Regret Nothing: More serious than most examples, but in the final episode of Fionna and Cake, when she and Simon finally say goodbye to each other, she states that despite not having chased her dream she doesn't regret her time with Simon.
- The Lost Lenore: To Simon, although as the Ice King, he's not really aware of it. It's subverted when Simon opens a Portal to the Past, intending to say goodbye to Betty... and she jumps through it to enter the present, meaning that she never really died after all. During the series finale "Come Along With Me", while Betty herself doesn't die, she is forced to fuse with GOLB in order to keep Simon safe and is forced to leave for another dimension.
- Love Martyr: Deconstructed; as her character is developed it's established that she spent so much time supporting Simon that she's barely considered what she wants for herself. Fionna and Cake expands on this by showing she put her life and career on hold to be with Simon and support his studies. The two of them realize that this relationship was an unwittingly toxic All Take and No Give and that she shouldn't have sacrificed so much and Simon should have been more thoughtful towards her. Then it is reconstructed in a bittersweet way since she says she does not regret her choices, but is also willing to move on now that she's given all she could and a relationship between them is no longer possible.
- Not Quite Dead: It was heavily implied she died early in the Mushroom War, hence why Simon never saw her again. Turns out it was because she jumped through a time portal, traveling to the present in which the show is set.
- Official Couple: With Simon... kind of. It's complicated. By the end of Fionna and Cake, she and Simon have moved on.
- Permafusion: She stays behind inside GOLB to use the Ice Crown to wish him away, but after finding he cannot be destroyed she wishes to save Simon at any cost, which causes her to be fused with the deity. Simon attempts for years to change her back, but is eventually forced to accept that Betty and GOLB will be one entity forever.
- Physical God: She inherited Grob Gob Glob Grod's power and eventually became the new GOLB in the finale.
- Posthumous Character: Subverted. Simon believes she died a thousand years ago, turns out she was just transported to the future in a Stable Time Loop.
- Power Born of Madness: Theorizes that all Magic Users have Magic, Madness, and Sadness. Confirmed when she screams and teleports away upon getting Magic Man's magic. Thus is foreshadowed in her cameo in "Jake the Brick" when she was looking at a paper with "M+M+S" on the top.
- Retcon: A minor one. When Simon recalls the first time he put on the Crown of Evergreen, he explicitly says by the time he took it off, she was looking at him with shock and contempt and he never saw her again. When we finally see the reason for her disappearance as a Stable Time Loop, she was never around to see Simon removing the crown. However, it could actually have been a result of the Crown starting to drive him insane and changing his memories as a result.
- Sanity Slippage: Spending too much time in Magic Man's head probably wasn't the best idea. Finn and Jake interrupting the ritual couldn't have helped much.
- Satellite Love Interest: Doesn't have much personality aside from being Simon's fiancee. Her status as the second human to enter Ooo is never discussed nor does Finn try to have a talk with her now that he isn't the only human in Ooo. Deconstructed in "Temple of Mars", where she reveals that she had spent so much time focusing on Simon that she had completely neglected her own ambitions and desires, and becomes a much more fleshed out character as a result. Fiona and Cake also give Betty some much needed characterization outside of Simon via flashbacks.
- Set Right What Once Went Wrong: In the Elements miniseries, she tries to prevent Simon from ever becoming the Ice King and avert the Mushroom War, which she thinks is this, but is callous about it wiping out Ooo from existence and the latter causes an Oh, Crap! moment from Prismo and Cosmic Owl.
- Stable Time Loop:
- She left Simon when he became the Ice King because the Simon from the future was saying goodbye to her through a Portal to the Past; thus she jumped through it to be with him there.
- Seeming creates another one in "Casper & Nova" by sending Simon into the future to experience the "Ancient Artifacts" holobook, which he later describes to Astrid who is heavily implied to later write the books herself.
- Star-Crossed Lovers:
- Implied in "Holly Jolly Secrets", with Simon having come to believe that she met her end in the Great Mushroom War. In "Betty", it turns out she didn't die after all... and she makes it her goal to save Simon from his fate.
- Betty and Simon briefly get a few minutes together before Betty sacrifices herself to fuse with GOLB, with Simon helpless to change her back. In Fionna and Cake, the two are able to accept that though they can't be together, they still are happy for what they had.
- Surprisingly Realistic Outcome: Fiona and Cake shows how easy it is to slide into an unwittingly toxic All Take and No Give relationship when the other party isn't assertive enough to insist their partner do things for their own sake rather than sacrifice their own happiness for the sake of the one that they're in a relationship with.
- Tranquil Fury: Implied, as she can't talk as GOLB. In Fionna and Cake when Simon goes to put the crown on his head, her glare on him intensifies before she transfers his consciousness into Shermy.
- Undying Loyalty: To Simon. We're initially led to believe she left him after the crown started taking control of him. Turns out when the Ice King used a time portal to say goodbye to her before he died, she jumped through the portal to the current timeline to be with Simon and has never faltered in her love for him.
- Unfazed Every Man: After escaping to the future she doesn't appear visibly fazed by any of the strange things around her. Kind of justified, as she had much more important things on her mind at that moment. But then given the title of the book she and Simon co-wrote, "Mystic Rituals And Their Space Time Applications", she was likely never "normal".
- The Unfettered:
- In Elements Part 8, she is shown to be willing to do whatever it takes to have Simon back to normal, even if it means going back in time to destroy the crown, potentially averting the Mushroom War, and cause all of Ooo to be Ret-Gone in the process of altering history, not caring about the consequences that might come out of it.
- Following this failure and her not learning the lesson King Man was trying to teach her in "Temple of Mars", she decides to summon GOLB, an ancient evil deity who can erase people and realities, just to save Simon and King Man's wife.
- Violently Protective Girlfriend: In Fionna and Cake, even over a decade since fusing with GOLB, she is still determined to keep Simon safe, blasting Scarab apart over and over again when he tries to kill Simon. Though, the trope is downplayed given she and Simon aren't really dating by that point.
- Walking Spoiler: Her role in the Ice King's origins makes her this. Her arrival in Ooo via time travel makes her all the more important.
- Walking the Earth: After Simon is forced to wear the crown again to save his life, she begins traveling Ooo in the hopes of finding a way to cure him.
Shoko
Voiced by: Isabelle Fuhrman
First appearing as a ghost in third season episode, "The Creeps", Shoko was a one-armed vagabond and mercenary with a tiger companion when she was still alive, and stole a powerful amulet from Princess Bubblegum in the time of the Candy Kingdom's founding. She dies in the attempt by falling into a radioactive river, but as "the Ghost Lady," she haunts the vault of Finn's mind, yearning for atonement. Finn is actually her reincarnation.
- Action Girl: A girl who rides a tiger and is a mercenary.
- Action Pet: Her tiger, who is also her mount.
- Ambiguously Human: Even though she has a name and upbringing from a distinctly human ethnicity, it's not quite certain what kind of humanoid she is.
- An Arm and a Leg: Her parents traded her right arm for a laptop, and she was taught that it was a worthy trade.
- Artificial Limbs: Bubblegum makes her a robot arm in return for helping build the Gumball Guardians.
- Ascended Extra: Originally part of a one-off Gainax Ending gag in "The Creeps".
- The Atoner: The reason why she haunts Finn's dreams. She wanted to return Bubblegum's amulet that she stole in life.
- Body Horror: Falling into a moat of radioactive Mutagenic Goo turned her into a weird worm-like creature. On the plus side, her right arm grew back.
- Chekhov's Gunman: Turned out to be a lot more important than she first appears...
- Continuity Nod: She shares the trademark artificial arm that most alternate versions of Finn possess, highlighting her relation to him as his prior incarnation.
- Family-Unfriendly Death: Essentially dies of radiation poisoning after being mutated into a horrific monster. The only silver lining is that it's a relatively quick death.
- Foreshadowing: Shoko is missing an arm, as do all alternate universe versions of Finn. As of "Escape From the Citadel", Main!Finn is finally missing one too.
- Handicapped Badass: She's missing an arm but is an experienced mercenary.
- Hilariously Abusive Childhood: Her parents traded her arm for a laptop, teach her that computers are worthy of such a tradeoff, and she just thinks such a sentiment is completely normal.
- Nuclear Mutant: She emerges from the radioactive river as one, but quickly dies. She then haunts Finn in that form.
- Our Ghosts Are Different: Her first appearance in "The Creeps", as well as in her cameo appearances afterward. "The Vault" implies that the castle from "The Creeps" was originally the base of the Bath Boy Gang who gave Shoko her final job, which suggests that she wasn't exactly a ghost, but part of a past life vision Finn was having.
- Parental Abandonment: Left at a dojo by her parents.
- Past-Life Memories: Most of what's known about her is from Finn's mental "Vault".
- Reincarnation: The most recent past life of Finn. The creators also confirmed her tiger is a past life of Jake, as Finn and Jake are almost always reincarnated together in some form.
- Stringy-Haired Ghost Girl: Her mutated form as a ghost resembles a more colorful and bizarre version of this trope.
- Terminal Transformation: Was mutated into a weird worm-like creature after falling into a moat of radioactive Mutagenic Goo, and only lived long enough to reach the spot that would become Finn and Jake's tree house.
Urgence Evergreen
Voiced by: Tom Kenny
Millions of years ago, Earth was protected by four elemental guardians representing Ice, Flame, Candy and Slime. The strongest in their number was Urgence Evergreen, master of ice. With this power and stature came arrogance and would lead to his undoing in an effort to stop a sinister comet through the creation of a magical wishing crown.
- Abusive Parents: He's Gunther's father in a way due to stealing his egg and giving him intelligence, and is an emotional abusive prick who demeans him. He only starts to realize this right before his death.
- Elemental Embodiment: He is the elemental of ice.
- Good Is Not Nice: Despite being an arrogant, weapons-grade Jerkass and extremist, he is genuinely trying to save the world from mass destruction.
- Greater-Scope Villain: Downplayed — he's not evil, just a jerk, but having created the Ice Crown and cocking it up he's responsible for all the trouble the Ice King causes. He's also the basis for his crazy personality.
- Heel Realization: When Gunther is driven to madness by the crown, he tries telling him to use focusing chants to regain his sanity "like I taught you", only to realize he never got around to teaching him anything.
- An Ice Person: The original one on Earth/Ooo.
- Jerkass: Takes Gunther for granted and continually keeps him at a distance and refusing to teach him magic. He also freezes his colleagues when they choose not to get involved with Wish Magic.
- Jerkass Has a Point: Though he doesn't give the appropriate response, he's absolutely right that the green Catalyst Comet is not to be taken lightly since it's the prior incarnation of the Lich.
- Meaningful Name: Evergreen trees thrive in cold, northern climates. The impending doom he has to deal with also requires urgence, and he does, in fact, run out of time. This also mirrors his future incarnation, who patiently waits in her ice shell for hundreds of years.
- Mooching Master: He uses Gunther as a cross between a pack horse and a valet without actually teaching him anything.
- Nice Job Breaking It, Hero: "Hero" is pushing it, but he does try to use the Ice Crown to stop the end of the world. However, his abuse towards Gunther causes him to fail at stopping the extinction of the dinosaurs, and creates an Artifact of Doom that causes people to turn into crazy, inferior versions of himself that could start a new Ice Age if overwhelmed.
- Red Herring: The episode of the same name suggests that he might have been reincarnated as the Ice King, considering they're both wizards with ice powers, share similar physical appearances, and even have the same voice actor. The episode "Elemental" reveals that he's not: Ice King is just Gunther's imitation of Evergreen, while his most recent reincarnation has been a Human Popsicle since before the Mushroom War.
- Replacement Goldfish: In a sense, people who put on the crown are this, as the crown transforms its wielder into Gunther's crazy, skewed version of Evergreen.
- Super Prototype: The Ice King's powers came to be when Gunther used the crown's wish magic to turn him into a magical impression of Urgence. Because of this, Ice King has all of Urgence Evergreen's abilities, but his madness and lack of skill make him (and by extension all other wearers a crown) nothing but a twisted, inferior xerox of the real Evergreen.
Gunther
Voiced by: Pamela Adlon
A young green dinosaur that Evergreen granted intelligence to serve as his assistant. Despite Evergreen's refusal to teach him magic and continually putting him down, Gunther sees Evergreen like a father and eagerly jumps at the chance to learn magic or join on Evergreen's adventures. Accompanied by a yellow proto-mammal cat named Nina.
- Brain Uploading: His mind lives on inside of the crown, along with everyone else who's ever worn it, including Simon and the original Santa Claus.
- The Chain of Harm: Urgence alternately uses and neglects Gunther, and in turn Gunther treats Nina just as selfishly.
- Hero-Worshipper: He remains extremely loyal to Evergreen, no matter how badly he gets mistreated by him. In the end, his wish to emulate Evergreen is so great that it overpowers his desire to save the world, turning him into the first Ice King. The thing is, because Evergreen never taught him any spells and the only thing he learned from the wizard was to say "Gunther, no!" all the time, he became a clone of Evergreen that only shouted, "Gunther, no!". Evergreen realizes this too late and can only watch as the comet destroys the world while Gunther chants "Gunther, no!" over and over again.
- An Ice Person: Becomes the original Ice King after making his wish on the crown.
- Inconsistent Spelling: Official spellings of his name are inconsistent on whether or not his name has an "H".
- Madness Mantra: After wishing to become more like Evergreen. The thing is, he didn't become exactly like Evergreen, but how he perceived Evergreen to be: a man who constantly scolded him. Gunther, no! Gunther, no! Gunther, no! Gunther, no...
- The Man Behind the Man: A non-villainous variant. He winds up becoming the original influence of Ice King's crown.
- One-Steve Limit: Averted, Gunther is also the name of Ice King's penguin. Of course, he's the reason that's the case.
- Reincarnation: It's implied by the title card and the Ice King's desperate obsession with being Finn and Jake's friends that Gunther and Nina are the earliest incarnations of Finn and Jake, respectively.
- Small Role, Big Impact: Considering he and Evergreen were directly at (or at least pretty close to) the Lich comet's impact point, Gunter most likely only wore the crown for a moments at most. However, that was still enough time to create and lock the Ice King persona into the crown, sealing the fates of all those who would wear it after him.
- Uplifted Animal: Gained intelligence and speech when Evergreen mutated him in the egg.
- Virtual Ghost: A backup of mind lives on inside the crown, alongside those of all who wore it after him.
- With Great Power Comes Great Insanity: When using the wishing crown, his desires to be like Evergreen emerge, turning him into the original Ice King. However, because Evergreen never taught Gunther anything and constantly scolded him, he turned into what he perceived Evergreen to be: a man who always says "Gunther, no!". And the ice magic he performs is weak compared to the real Evergreen.
Elise (SPOILERS)
Voiced by: Rebecca Sugar ("Everything Stays"), Erica Luttrell ("Obsidian")
First seen in a flashback in "Everything Stays", she was a human woman who gave birth to Marceline right before the Mushroom War.
- Ambiguously Brown: She either has a dark tan or may have mixed blood in her family.
- Blood from the Mouth: When her persistent cough worsened to the point that blood ended up on the palm of her hand, she fully realized that she didn't have long to live.
- Creator Cameo: Was initially voiced by Rebecca Sugar, an ex-storyboard artist responsible for much of Marceline's development. "Obsidian" replaces her with Erica Luttrell, who regularly appeared on Steven Universe, a show created by Sugar.
- Daddy Had a Good Reason for Abandoning You: Or rather "Mommy" in this case. Deconstructed and Played for Drama. As Marceline points out, while her mother did mean well (namely not letting her see her dying), this left Marcy with major abandonment issues and having a hard to deal and express negative emotions.
- Dying Alone: Invoked. She didn't want her daughter to see she was dying, so she sent her away with a lie.
- Good Parents: From the little that is seen, she certainly does a good job raising a half-human/half-demon child (presumably by herself mainly). Though Obsidian showed she was prone to make mistakes like any other parent.
- Incurable Cough of Death: In Obsidian she is very sick looking, and has a bad cough. When she starts coughing up blood she sends Marceline away, so her daughter wouldn't see her die. The very beginning of the special shows Elise and Marceline walking near a wrecked nuclear plant so its possible she has radiation poisoning.
- Innocently Insensitive: She reacted with fear when her Marceline used her demon soul sucking powers to save her. When Elise sends Marceline away shortly after, young Marcy thinks its because Elise is afraid of her.
- Interspecies Romance: Had one with Hunson Abadeer at some point.
- "Not So Different" Remark: To Simon (a.k.a The Ice King). Both of them are the only positive relationships Marceline had in her youth, and both of them abandoned her at one point for sympathetic reasons (her mother sent her away so she wouldn't watch her dying; Simon left her before the power of the Ice Crown finally made him go bonkers).
- Parental Abandonment: Sent Marcie away at a young age so she wouldn't have to watch her die. Marceline grew up thinking her mother had grown frightened of her.
- Parents as People: She tried her best but hid a lot from her daughter, including the fact that she was dying. This ended up causing Marcy herself to have abandonment issues and trouble expressing her emotions.
- Poor Communication Kills: Elise refused to talk about anything even remotely bad or upsetting with Marcy, which included the fact that she was sick and dying. This led to Marcy herself having a hard time dealing with negative emotions.
- Posthumous Character: Confirmed to have died before the start of the series in "Obsidian".
- The Unreveal: Just how she got into a relationship with Hudson Abadeer, especially considering this was before the return of magic. In fact, her first words heard was her finishing this story to a young Marceline:Then he said fine. And that's the story of how I met your dad.
- Unnamed Parent: Until the credits of "Obsidian" identify her as Elise.
Future Characters
Cuber
Voiced by: Emo Phillips
An odd figure from the future, and narrator of stories he calls Graybles.
- Future Slang: Peppers his sentences with nonsensical slang words. For example.Cuber: I'll see you crimpy glimmers on triode flimpin' the diode.
- Greek Chorus: Acts as one for his Graybles.
- The Legend of Chekhov: His Graybles appear to be thematically-tied short stories, then we later learn that they're true accounts from 1,000+ years earlier.
- No Fourth Wall: He routinely speaks directly to the viewers.
- Trickster Mentor: Sorta acts like this to the viewers because some of his Graybles are designed to mislead the audience.
Gibbon
Click here to see his future self.
Voiced by: N/A
Charlie the Raincorn Pup's son and Jake and Lady Rainicorn's grandson. He was born with the power of urine manipulation but learned many other magics by following in his mother's occult interests, eventually becoming immortal. In the future of the Land of Ooo, he founds the Pup Kingdom, comprised of Jake and Lady's thousands of descendants. As he ages, he turns into a tyrant that steals the powers of his Rainicorn Pup subjects.
- Age Without Youth: He's immortal but still ages, so by the year 1000 he looks like a ragged mop.
- All There in the Manual: He only makes two brief appearances in the series and all other information about him comes directly from the writers.
- Big Bad: Of Future Ooo. Or at least the only one revealed.
- The Conqueror: The Pup Kingdom's expansionist empire is apparently why the Candy Kingdom had to go into hiding inside the Prize Ball Guardians.
- Even Bad Men Love Their Mamas: He misses his mother, Charlie, and seems to have some mental issues about it.
- Evil Overlord: Of the Pup Kingdom.
- Expy: As an immortal old King tormented by sadness and madness, he's very much like the future version of the Ice King. His weapon is even ice magic powered by one of Evergreen's rubies. Unlike the Ice King, though, he's not senile and can hold his emotions together in front of his subjects which is why he rules quite a bit of future Ooo.
- Eyepatch of Power: One of his eyes has been replaced with one of the Ice Thing's rubies, and the Ice Thing is always trying to reclaim it.
- A Father to His Men: As only the seventh Rainicorn Pup in existence, he considers all others his children and grandchildren. A more abusive example considering he still steals their magic to consolidate his own.
- From Nobody to Nightmare: A minor character who appears to be Charlie's future son in "Daddy Daughter Card Wars" grows up to become one of the most powerful and feared Pups in Future Ooo.
- Galactic Conqueror: The fact that the Pup Kingdom has a Space Elevator implies he has his sights set on this.
- God-Emperor: His power of immortality is bolstered by the technology of future Ooo and centuries of sorcery.
- Irony: It is heavily implied that he is the one that led The Pup Kingdom to victory against the Candy Kingdom which causes it to be abandoned to ruin. This is in stark contrast to his grandfather and grandmother were staunch supporters of the Candy Kingdom and were Princess Bubblegum's closet friends.
- Kick the Dog: To compensate for his own Pup Power being stolen, he steals powers from newborn Pups at birth.
- Non-Human Humanoid Hybrid: Part Rainicorn, part magical dog, part alien, part "purposeful unsolvable mystery".
- Power Parasite: He erases and steals most of the magical powers his Kingdom's inhabitants are born with. Pup powers can be harmless, like the ability to wiggle ears, make eyes glow, or write graffiti on walls. Some are incredibly deadly, like future pup Raisin's ability to cause ''nuclear explosions'' when she gets angry. So he at least has somewhat of a point when it comes to this.
- Sorcerous Overlord: Has sorcerous powers.
- Superpower Lottery: Being born with the rather lame/disturbing power of urine manipulation may have been the catalyst in his search for magical power.
- Toilet Humor: His original Pup Power was the ability to manipulate urine with his mind. He later somehow traded this for the power of Immortality, possibly via Ice Thing's ruby.
- Villain of Another Story: He's the Big Bad of Future Ooo. Since he only appears in the intro in the series finale, we'll never get to see it. We do get to see a small bit of Shermy and Beth fighting against his regime in "Casper & Nova" however.
- Who Wants to Live Forever?: He never gets over the death of Charlie from old age, and since he lives forever his sorrow only grows more as he gets older.
Shermy & Beth
Shermy on top of Beth
Shermy voiced by: Sean Giambrone
Beth voiced by: Willow Smith (Come Along With Me), Imani Hakim (Fionna and Cake (2023))
Two adventurers from 1000 years in the future who in their travels discover Finn's prosthetic arm and learn of the events of the Great Gum War.
- All There in the Manual: All the information about the Pup Kingdom is largely drawn from writers, artists, and producers showing off conceptual stuff online.
- Cartoon Creature: Shermy looks like some cross between a cat, a monkey, a mouse, and a human. In a future where Rainicorn Pups are the continent's dominant species, that sort of thing may be more common. He's actually just a cat, but he looks quite a bit different than the others in the show.
- The Exile: Beth is wanted by the Pup Kingdom for opposing King Gibbon's rule.
- Fantastically Indifferent: When Shermy's mind is overtaken by Simon, his consciousness is shown just playing video games in his head while Simon is in control. Once he regains control, he cheerfully and casually announces to Beth the fact he was forcibly taken over by another consciousness for a while.
- Framing Device: The future King of Ooo tells the two the story of the Great Gum War.
- Generation Xerox: Two best friend adventurers who travel the world of Ooo, like Finn and Jake. Shermy is excitable and always ready for adventure while Beth is more cautious and reserved. Shermy is implied to be Finn's reincarnation and Beth is Jake's direct descendant. At the end of the story, Shermy inherits Fern's Finn Sword as well.
- Keet: Shermy. He's an excitable ball of energy that seems to love adventuring as much as Finn.
- La Résistance: They fight against the Pup Kingdom and oppose Gibbon's rule. By the time of "Casper & Nova", they have gotten halfway through their well thought out plan for the revolution such as gathering allies and publicly defacing Gibbon's pictures throughout the Pup Kingdom.
- Last Episode, New Character: The two of them are introduced in the series finale.
- Portmanteau: Shermy's name is actually a combination of the last and first names of Finn's voice actor, Jeremy Shada.
- Rebellious Princess: Beth is referred to as "the Pup Princess" in the intro to the final episode, and she's in exile because she rebelled against the King of the Pup Kingdom for his theft of magic from other Rainicorn Pups.
- Red Oni, Blue Oni: The energetic Shermy acts as the red to the more responsible, laid-back Beth's blue.
- Reincarnation: Implied to be the reincarnations of Finn and Jake as Shermy and Beth respectively.
- Thinking Up Portals: Beth has the ability to open portals through her navel.
- Tiny Guy, Huge Girl: Exaggerated; Beth completely dwarfs Shermy in size, the former around the size of Donny and the latter about a head taller than BMO.
The Ice Thing
Voiced by: Tom Kenny
The Ice Thing rules over the Ice Thingdom 1000 years in the future. He's fused completely with the Ice Crown as a flying beard with the crown's gems for eyes.
In "Come Along With Me", it's revealed that the Ice Thing is the future version of Gunter, who took the Ice Crown after Simon reverts back to normal.
- Almighty Idiot: Give an ancient cosmic being (Orgalorg) of incredible power a crown with immense magical properties? You end up with an insane cackling creature with barely any sapience.
- Animal Nemesis: Slightly inverted, as it's implied he constantly attacks the Pup Kingdom to try to reclaim his stolen ruby eye.
- Dismantled MacGuffin: He's missing one of the rubies of the Ice Crown. He originally removed it to give to Turtle Princess as their wedding ring. However, Gibbon of the Pup Kingdom somehow got it and replaced his eye with it to use ice magic. Only having 2/3rds of the crown's power may be why he became a mutated, mad beast.
- Driven to Madness: Okay, the Ice King was always insane, but the Ice Thing in the present is still capable of speech and interaction. In the future, he's completely lost it, as all he does is cackle and fly around. Averted when it turns out he's not Ice King at all, but Gunter transformed by Ice King's crown.
- Eye Scream: Played with, since he originally gave up one of his eyes willingly to Turtle Princess, but clearly wants it back now that Gibbon has it.
- Laughing Mad: All it does is cackle.
- Memento MacGuffin: His missing eye isn't just a magical artifact, it's also his deceased wife's, wedding ring.
The Prize Ball Guardians
The successors to Candy Kingdom's Gumball Guardians, these towering machines wander the Land of Ooo, seemingly serving as protectors the Candy Kingdom citizens they hold in stasis within themselves.
- A.I. Is a Crapshoot: Implied to be the case with at least the one seen in "Graybles 1000+", as its recreational area is dark and unused and all its occupants are locked away in stasis.
- Colony Ship: A purely terrestrial variant. They hold the citizens of the Candy Kingdom in stasis, presumably to keep them safe from the likes of Gibbon and his Pup Kingdom.
- Humongous Mecha: They are gigantic, easily dwarfing the old Gumball Guardians.
- Superior Successor: To the Gumball Guardians.
- Your Head Asplode: Cuber does this to one of them.
