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  • Abandon Shipping:
    • Some Fubblegum shippers sorrowfully tied up their ships and left them at the dock after "Too Young" revealed that Princess Bubblegum won't date Finn because of the age difference, and she told the boy to "move on."
    • Some Finnceline shippers did this after Marceline's ship sinking with Finn in "Go With Me."
    • Some Finnceline and Fubblegum shippers left their ships to join the ranks of the canon-in-the-past Princess Bubblegum and Marceline ship.
    • After the premiere of "Incendium", various shippers (but Fubblegum in particular) left their old ships in favor of Finn/Flame Princess. Finn/FP shippers jumped themselves after Finn's behavior in "Frost and Fire" and "Red Throne".
    • This happens In-Universe in the episode "All The Little People", where Finn ships and abandons several pairings.
    • Most Lemonzest shippers stopped shipping the Lemongrabs after "Another Five More Short Graybles" reveals that they are actually brothers. Even more left after the eating and "Too Old".
  • Acceptable Targets: Abusive boyfriends (like Ash, the Party God and Ricardio) are always portrayed like massive Hate Sinks. Nobody's really complaining when Karma comes into play.
  • Accidental Innuendo:
    • This:
      Finn: Princess! Put your butt here! Now, shove this in your mouth! It's hot!
      Princess Bubblegum: Finn, I don't understand—
      Finn: Please, Princess! Just stick it in your mouth!
    • From "Freak City":
      Finn: Kim! Get underneath Trudy!
      Kim: No, man, please! I frickin' hate Trudy!
      Finn: KIM! I WILL DESTROY YOU!!
      Kim: Okay, okay!
      Jake: Heh-heh-heh... Yeah...
    • From "The Pods":
      Jake: It's squirting!
      Finn: Squirting?!
      Jake: See? Squirting! ...Tastes good.
      Finn: Dang, man! Don't just lick stuff! It's evil!
    • From "Evicted!":
      Finn: I'm feelin'... I'm feelin' like we did it. I feel... completely satisfied..
    • From "Incendium":
      Finn: I can't keep pushing this down... any deeper.
  • Accidental Aesop:
    • "You Made Me!" has spawned a ton of these. "If you can't love yourself, you can't love somebody else"? "Everyone has a soul mate"? "A negative times a negative equals a positive"? "Friendship makes everything better"? "You are your own worst enemy"? Take your pick- they all work out nicely.
    • One moral that could be construed from "Too Young" is "Inexperienced, immature people should not be given positions of leadership."
    • One interpretation on "Wizards Only, Fools", is watch out for bootleg medicine, that may actually be fake.
  • Alas, Poor Scrappy: If you viewed Lemongrab 2 as an example of this, then this trope would definitely hit you when Lemongrab devours him.
  • Alternative Character Interpretation:
    • Based on the ending of "BMO Lost", Jake's indifference towards BMO might be deliberate.
    • There's also the question if Jake's laziness is actually due to him being afraid of being so powerful that he would constantly receive instant-gratification in everything he attempts, and thus would end up completely jaded with life (as he insinuated to BMO after he got a shard of tortilla chip stuck between his teeth), or if that is just an excuse and Jake just genuinely enjoys being lazy and putting in as little effort as possible, wasting his incredible talents.
    • Ice King: A loser and jerkass who always tries to force princesses to marry him, a tragic Woobie who just needs a hug and a reason to be happy, or is his mind just too muddled by the crown for him to fully comprehend that what he's doing to other people is wrong?
      Ice King: I don't know... I'm complicated.
    • Lemongrab:
      • Safe to say he's quite a bit smarter than he would let on, but to what extent? Word of God confirmed that Lemongrab was the one who built the Sound Sword. It's not far of a stretch to imagine Lemongrab could even be a Genius Ditz, as it has been demonstrated in Real Life that autistic people can be incredibly skilled in some specialized areas.
      • His first appearance in "Too Young," where he cries after being beaten up: was he crying because he was in physical pain? Or was he really, really depressed? Subsequent events have shown that he is quite immune to physical pain. He has survived to falls from towers and had their brains without skin, with no trace of pain, so here it is very plausible that he was crying about feeling emotionally hurt being bullied and treated like crap by his own mother.
      • In "Too Old", did Lemongrab abuse his children and his clone because of his extreme mental problems? Or was he lashing out because of his grief over Lemonjon's death? Considering the thoughts he had in his brain after Lemonjon's death ("RAGE," "SUFFER," "call me crazy, but it's time we die") supports this.
    • Related to Lemongrab, is Princess Bubblegum keeping a hands-off approach to him due to the complexity of legal treaties, or because she simply doesn't want to have to deal with him? Most of the time Bubblegum can't stand to be in Lemongrab's presence for more than a few minutes, and leaves him to his own demented devices as soon as a convenient band-aid can be slapped on whatever problem he's causing: this ranges from dumping him in another castle after his botched creation, to creating a second just-as-flawed Lemongrab (which made the problem far worse), to barely noticing that Lemongrab was electro-shocking his citizens and had half-eaten his brother in her rush to get away from him, and finally to sewing him back together and then abandoning him yet again.
    • Before her first physical appearance in the series, Betty got quite a bit of this, due to her having a pretty big role in the Ice King's backstory. The interpretation boiled down to whether she really was as nice as Simon made her out to be, since she left Simon after he went on some kind of nutty rant under the crown's influence. That interpretation was completely Jossed in her own title episode when it was revealed that Betty never truly left Simon, simply jumped into the portal to the future to be with him, and showed her dedication to Simon by promising to find a way to free him from the Ice Crown.
      • Her potential relationship with the Ice King now that she has Magic Man's powers that we now know is linked to "madness" and "sadness". Is it better for her to become as crazy as the Ice King and let them be crazy together forever and Simon never being healed or is that far more tragic than him just dying. Is the only really happy ending her healing him? It really all comes down to how the viewer interprets the effects of M+M+S.
    • To some, Braco was a massive woobie who was absolutely deserving of PB's love, and was unfairly rejected. To others, he's an entitled stalker, and was way too willing to settle down with the PB-Bot (casting doubt on whether he really cared about her as a person in the first place).
    • Was Flame Princess right in dumping Finn after he "betrayed" her? Or did she grossly overreact and let one bad experience automatically cancel out all the good times she and Finn had together?
    • Vampire King: was he being sincere in that he wanted to break the cycle and remove vampirism from the world, or was it all just a ploy in order to release his pure black essence of vampirism onto the world? Alternatively, maybe both are true; perhaps Vampire King was already aware no matter what the dark cloud of his essence would always be a plague onto the world, but wanted to remove himself physically from the equation. The wheel of fortune still exists as it always has, but he removed himself from that cycle.
  • And You Thought It Would Fail: Many people did. Due to how MS Paint-style-looking and admittedly silly and nonsensical the original short was, it was thought that the show would not be that popular; but lo and behold, the first episodes got over 2 million views and Adventure Time quickly became one of the most popular cartoons to come out in The New '10s.
  • Angst? What Angst?: Subverted with Finn, who for the first few seasons is bizarrely upbeat about everything. But as he gets older, "the vault" is seen as not a good idea, he fucks up hard regarding romance (losing Princess Bubblegum to outside influences and Flame Princess due to his emotional manipulations), and he goes into straight clinical depression regarding his father and losing his arm. Same goes with Jake and his kids. At first he's fine with them growing up so fast because looking after them was too much responsibility, but then really gets melancholy about it, and season six goes into their point of view, as although he misses them, all they know is that he's neglected them all except Jake Jr.
    • In-universe (and played for attempted laughs), Ice King didn't care at all that Princess Monster Wife died, instead despairing over the fact that she "gave away all [his] stuff". He also got over Finn's "death" pretty fast in "What Have You Done?" to the point that it's depressing for Finn.
    • Lemonhope is a cheerful, chipper little boy despite a life of being abused by a violent, unstable father, witnessing the abuse of all of his siblings, and eventually witnessing his father eating his other father. Despite all of that, he remains, seemingly, optimistic and hopeful, hence his name. This turns out to be because he is very self-absorbed; if he is happy and free then he doesn't have to worry about anything else.
  • Anti-Climax Boss: Orgalorg was set up as some world-destroying monster along the likes of the Lich. When he makes his appearance, he tries to absorb the Catalyst Comet, ends up being cut out from the inside by Finn, and goes right back to being Gunther due to latching onto Banana Man's rocket in a weakened state.
    • Despite his grand return being teased several times, the Lich's last fragment is ultimately destroyed rather easily by Sweet Pea (who decides not to become evil) in "Whispers", while Finn is stuck and unable to contribute.
    • For all his buildup Golb ends up being this in the Grand Finale. He's essentially defeated by BMO and his singing due to his chaotic nature. Then he gets hijacked by Betty without doing much.
  • Applicability: "All the Little People" has been interpreted as being one big, long Take That! to obsessive shippers [1] and/or symbolic of Finn's "pubescent sexual awakening", the start of his manipulative side, and/or symbolic of the crew's creative process. [2]
  • Ass Pull: Cinnamon Bun's sudden boost in intelligence by means of baking was debated to be this by the fans mainly because he was wearing the Flame Shield, which was supposed to protect the wearer from extreme heat.
    • That, and the fact that the writers seem to flip-flop on whether he's competent or not after being baked.
  • Author's Saving Throw:
    • Many fans were understandably pissed off when the arc involving Finn losing his arm, which had been foreshadowed forever, was clumsily resolved in "Breezy." Season 7 rectifies this by having him lose his arm again, this time for good. Finn himself admits that he's not too bummed about this, because he feels like this was always meant to happen.
    • Lemongrab (both 1 and 2) has always been one of the most polarizing characters in the fandom and their Flanderization and overexposure in season 5 has only pissed fans off even more. The creators resolved this by blowing them up and having PB construct a third Lemongrab. The new Lemongrab is much more stable than either of his predecessors while still keeping some of the original Lemongrab's personality quirks. And he appears noticeably less.
    • Finn's manipulation of Flame Princess in "Frost & Fire" and Bubblegum's control and surveillance of others are acknowledged and addressed in "Bun Bun" and "The Cooler", respectively.
    • Marceline and Bubblegum's past relationship being left to Word of Saint Paul for years (due to the show's broadcasting in places where homosexuality is a crime) has often been criticized. "Come Along With Me" ultimately has Marceline confess her feelings, followed by an onscreen kiss and confirmation of them as an Official Couple.
  • Award Snub: Some fans felt that the Adventure Time episode "Too Young" was robbed of the 2012 Emmy by Regular Show's "Eggscelent". Because the Adventure Time fandom largely overlaps with the Regular Show fandom, many fans thought that AT winning the Emmy would have robbed Regular Show!
  • Awesome Art: The title cards are all really freaking pretty, and also many of the backgrounds.
  • Base-Breaking Character:
    • Lumpy Space Princess: Some people enjoy her presence, others find her annoying and obnoxious.
    • Tree Trunks: Some people enjoy her naive stupidity, others find it grating. Her Dirty Old Woman tendencies are equally divisive, with some fans finding them hilarious and others feeling uncomfortable about them (especially since some of her suggestive comments are directed towards the teenage Finn.
    • Cinnamon Bun. Some find him to be endearingly naive as a foil to PB, others just find him annoying.
    • Princess Bubblegum is one of the most infamous examples; one half of the fandom views her as an adorable, smart and likable character while others view her as a tyrannical jerkass. The show, however, seems to present both interpretations as being somewhat accurate, portraying PB as wanting to be kind and meaning well, but having been alive for so long she's prone to making decisions based solely on the long-term and not taking into consideration of other people's immediate needs or feelings. Her Character Development in Seasons 6 and 7 seems to have decreased this.
    • Lemongrab: To put it simply, he's either a The Woobie, a Jerkass Woobie, or a Woobie, Destroyer of Worlds. Fans are really divided with this character.
    • Lemonhope: Some people see Lemonhope as a sympathetic and likable character, others think he's an uninteresting jerk that lacks Lemongrab's humorous quirks. The fact that he causes fellow base breaker Lemongrab to explode causes fans to be even more divided by him.
    • Neptr. Is he a poor lonely little guy who doesn't get enough love and attention from his "family" (Finn and Jake ignore him, BMO seems to show some animosity towards him lately), or an annoying useless character people would rather soon forget?
    • Gumbald. While some think he's a cunning, menacing antagonist that's worthy to be one of the show's final villains, others find him to be a shallow, underdeveloped villain that can't compare to the show's former big bad, The Lich.
  • Big-Lipped Alligator Moment: Given the nature of the show, there are a lot of these, be it subtle and small Noodle Incidents or Orphaned Punchlines or in-your-face, full blown BLAMs. Some of the stand-outs are:
    • The Abraham Lincoln scene in the pilot. When he shows up again in the series proper, it's just as jarring to people who haven't watched the pilot.
    • The ending to "The Other Tarts."
    • Jake's Dream Sequence when he falls asleep during Princess Bubblegum's lecture:
      Jake: Where am I?
      (the camera pans over to show a tiny giraffe, a tiny snowman and a tiny version of Tree Trunks)
      Tiny Snowman: Jake, you're president now!
      Jake: Oh my gosh!
      (Jake proceeds to sway back and forth while the tiny snowman, giraffe and Tree Trunks all clap.)
    • The scene in "Beyond This Earthly Realm" when the Ice King breaks the fourth wall and proceeds to make an elaborate speech to the audience.
    • Finn's premonition dream in "The Lich" is incredibly random, aside from the key moment where the Lich kills Billy.
    • The scene in "A Glitch Is a Glitch" where Jake's arm and PB's hand make out. Yeah...
  • Bizarro Episode: "BMO Noire" makes no sense, even by this show's standards.
    • "King Worm". Which bizarrely acts like something of a Mind Screwdriver for the Gainax Ending of "Evicted"... Sorta.
    • Also the "Fionna and Cake" episodes, which have gender-flipped versions of everyone in the cast.
    • The best contender so far has to be "A Glitch Is a Glitch" for its CGI Art Shift and exceptionally weird presentation.
    • "Puhoy" is an episode spent almost entirely inside a pillow world that may or may not have been a dream. Similarly, "Rainy Day Daydream" is an episode about Jake inexplicably gaining Reality Warper powers via his imagination. Expect weird stuff that doesn't normally occur to happen when there's a knife storm (which is in itself weird).
    • Another of the guest animator episodes "The Food Chain" and especially "Water Park Pranks" tend to be seen as not only bizarre but divisive among fans.
    • "Sad Face" is all about Jake's tail living a double life as a clown when he goes to sleep and features no previously established characters in the actual plot. Even "Blue Nose"'s more artsy numbers at the circus are freaking strange.
  • Broken Base:
    • Some people were psyched with the announcement of the Gender Flip episode. Others... not so much.
    • Fans who only want adventurous episodes (because the show has "Adventure" in its name) versus fans who want more episodes focusing on shipping potential and/or just general weirdness. Most episodes are of the former kind. Ironically enough, season six's "season one-like" episodes ("Walnut and Rain" for example) didn't get as good a reception as the more philosophical episodes of that season.
    • Those who like that creators are very aware of the fandom and those who feel that the show has gone too far pandering to the fans, chiefly regarding the existence of Fionna and Cake.
    • "A Glitch is a Glitch" as a lot of people really enjoyed its unique art style and unusually bizarre premise while others despise it for the very same reasons claiming it's too different.
    • "Too Old." Those who like it are fond of it for its darkness, drama, and suspense. Those who hate it absolutely despise it for the Fridge Horror of Lemongrab's actions physically and verbally abusing of his kids and clone, and eventually committing presumed murder and the fact that only Lemonhope was rescued at the end.
    • "Breezy" got a lot of controversy. Most would agree it's uncomfortable, but whether it's a necessary look at depression and a realistic using "kissing" to fill the void, or too much and made LSP cross a Moral Event Horizon depends on who you talk to.
    • The Stakes mini-series for a lot of reasons, such as the feeling the villains didn't get enough screen time, Marcie turning out to be a demon turned vampire (though some argue she is a half human hybrid, so that's why the change was so effective) or even that Finn was mostly useless throughout. The biggest point of contention though is easily the Status Quo Is God ending; it doesn't help that "Everything Stays" is basically "Status Quo: The Song".
    • The entire fact that the show has never been allowed to explicitly reference Marceline and Princess Bubblegum having previously been an item despite numerous actors and crew giving Word of God about it. After shows like The Legend of Korra and Steven Universe have made huge inroads in portraying homosexuality in western animation, many fans are wondering even more what the hell is the problem with this show joining them. This was resolved in the series finale, when the two share The Big Damn Kiss and a Relationship Upgrade.
    • Weirder episodes played not for laughs, such as existentialist or symbolic episodes, tend to get mixed reactions. One side loves their depth, while the other side hates them for being confusing, some accusing the writers of invoking Faux Symbolism that doesn't really mean anything.
  • Complete Monster: The seemingly sweet land of Ooo has many villains, but while many are either very tragic or not serious, the same cannot be said of this despicable duo:
    • The Lich is an evil, ancient sorcerer and the "last scholar of GOLB", who returns time and time again from seeming destruction focused solely on one thing: the destruction of all life. With his first few attempts to use his well of power to restore his power and bring about the end of Ooo foiled by Billy and later Finn, the Lich possesses Princess Bubblegum to use her body for his purposes. The Lich later murders Billy in retribution for his past defeat, wearing his skin to trick Finn into giving him the Enchiridion so he can enter the Time Room and wish for the extinction of all life across the multiverse. The Lich spitefully murders Prismo and his physical body and tries to use an army of cosmic breakouts to destroy a billion worlds across the universe, turned into a harmless baby named Sweet P afterwards. Even then, a version of the Lich from a parallel reality later manipulated that world's version of Finn to gain access to the multiverse and build up a mountain of broken bodies, even mentally torturing Sweet P for nights on end to try and turn him back into the Lich as his last scheme. Permanently changing the tone of a once-zany show with his presence, the Lich and his endless devotion to the destruction of all life immortalize him as the most horrifying villain in the series.
    • Dr. Gross, from season 7's "Preboot" and season 8's "Islands" miniseries, was formerly a scientist and doctor on the series of islands founded by Minerva Campbell as a refuge for the remnants of humanity, training children to become "Seekers", with no hesitation in brainwashing them and having them brutalize their own friends to prevent any escape from the islands. Dr. Gross eventually turned to twisted experiments on sentient beings, with her recklessness accidentally unleashing a virus that killed off two-thirds of all humanity on the islands—to her complete apathy. Escaping the islands, Gross continued her experiments, scheming to return to the islands and forcibly augment all humanity into cybernetic abominations like herself, even trying to cut apart Finn and his friends to use as raw material. An unfeeling scientist with zero empathy, Dr. Gross proves that, sometimes, Humans Are the Real Monsters.
    • Comic Book: As vile as he is in the cartoon, The Lich continues his crusade to destroy all life after his defeat in Princess Bubblegum's body, taking physical form again to use a Bag of Holding to suck up thousands across Ooo, with the ultimate intent to suck up the entire planet and throw it all into the sun. Even destroyed, the remnants of the Lich's power continue to horrify and torment Finn, with an echo of the Lich's power creating a dungeon to Mind Rape the heroes—taunting the Ice King/Simon Petrikov with an image of his old love Betty and forcing him to watch as she fell apart—and twisted a sentient tree into a horrible monster, both in preparation to eventually recuperate and destroy life again.
  • Continuity Lock-Out: From Season 5 onwards this kicks in, and only gets more and more pronounced. Many episodes later on expect you to fully understand the lore of the series and recall events from 20+ episodes ago.
  • Crack Pairing:
    • Finn and Fionna. Yes, it exists, though just as many people depict them as long-lost twins. Likewise for Bubblegum/Gumball and Marceline/Marshall Lee.
    • Fionna and Flame Princess.
    • Lemongrab and Prince Gumball or Lemongrab and Tree Trunks. GumGrab and LemonTrunks.
    • In-universe with Finn shipping BMO and Ice King and him mixing different couples of the toy version of his friends like LSP/Mr. Cupcake, and Marceline/Peppermint Butler.
    • Now that the Lemon-Gay ship has burst into flames and plummeted, a few fans have decided to ship Morbidly Obese Lemongrab with his pudding. Also counts as a Cargo Ship.
  • Crazy Awesome: Finn and Jake's dad, Joshua. Amongst other things he's fought all kinds of monsters and demons, built entire dungeons just to make sure his sons are badasses themselves, knows spells that make enemies explode into fire and banishes them to the Nightosphere, and forged and wielded a sword made out of demon blood. No wonder Finn and Jake turned out the way they did.
    • The Ice King has his moments whenever he's fighting against Finn and Jake and using his powers effectively.
  • Creepy Awesome:
    • That Schrödinger's Cat thing in the dungeon episode - mostly because of his compelling voice (provided by Clancy Brown) and him saying, very casually, that he would "unzip Finn's skin and wear it like a little coat."
    • Lemongrab get a dose of this in "You Made Me!". He reveals that his sword shoots sound blasts, and it's implied that he's an inventor of sorts. He apparently made a room whose sole purpose is to electrocute people through the floor.
    • The Lich. He's the Big Bad of the show, and is so scary that he's somehow amazing.
    • Goliad! A cute candy sphinx with a baby face and the voice of a little girl, who mind-controls people using her psychic powers.
    • MAGIC MAAAN!!! On one occasion, he whistles, which causes a bird to flutter down and land on his finger. With a wave of his free hand, the bird gets turned inside out, and flops away.
    • I'm going to cut out Princess Bubblegum's heart AND MAKE OUT WITH IT! Ricardio is awesome for being voiced by George Takei, for being one of the most unexpectedly horrifying villains in the show, and for being all of the Ice King's most evil attributes incarnated into a heart.
    • Hunson Abadeer. He is essentially the Adventure Time universe's version of Satan.
  • Crosses the Line Twice: Many times, but especially the scene of Jake reading his pups "The Baby-Eating Fox and the Babies" storybook in "Jake the Dad".
    Jake: (after reading through a few pages) This is a lot darker than I remember it...
  • Cry for the Devil:
  • Die for Our Ship:
    • Flame Princess got this initially just for being a Third-Option Love Interest to Bubblegum and Marceline, but later got a more subdued version of the trope because she couldn't even touch Finn without hurting him. It eventually all but evaporated after she and Finn permanently broke up.
    • When this trope is applied to her, Princess Bubblegum becomes a sociopathic monster who only fake cares about others as long as she can use them.
      • Bubblegum also gets hit by what can only be called a reversed version of the trope, as people will ship her with anyone, especially Finn and Marceline, despite her showing clear and firm signs of not wanting to be in a relationship.
    • Heck, even Marceline gets hit occasionally.
    • After "Too Young", a lot of fanart depicting Lemongrab's demise sprung up on the internet.
  • Draco in Leather Pants:
    • The Ice King, now that we know his past. He's easily much more sympathetic, and the show itself has toned down his evilness and upped his doddering insanity since past the first season, but some people go so far as to say he isn't a villain and his kidnappings are harmless and alright. The show often follows up a woobie episode of his with something that hammers in that he's a Not-So-Harmless Villain (like "Princess Monster Wife" followed "Holly Jolly Secrets").
    • Lemongrab 1, until his Ax-Crazy behavior and his extreme change in physical appearance in "Too Old".
    • Ash, too, for the same reason Marceline ignored his bad traits: He's a punk rocker bad boy.
    • Hunson Abadeer is the closest thing to Satan, rules the Nightosphere in a state of chaos and disarray, and his love for his daughter Marceline is his sole redeeming trait. Fandom tends to portray him as a Bumbling Dad, probably because he's a light parody of one.
  • Dry Docked Ship: Princess Bubblegum and Marceline. Olivia Olsen confirmed that they were ex-girlfriends, but that the show wasn't allowed to portray it as TV executives for kids' shows are usually wary of showing same-sex couples out of fear of backlash from advertisers and viewers (though Steven Universe, Clarence, and The Amazing World of Gumball have shown that it can be done with little to no controversynote ). They come out of dry dock in the series finale.
  • Ear Worm: Jake's bacon pancakes jingle is extremely catchy, especially set to the tune of "Empire State of Mind".
  • Ensemble Dark Horse:
    • The entire Gender Flipped world rivaled the normal one in popularity even before "Fionna and Cake" was made. Special props, however, go to Marshall Lee, who is arguably the most popular one of all, despite his only appearance in that episode being a silent cameo. The episode dedicated to him increased his popularity a billion fold, especially because he's genuinely much more of a mischievous, traditional trickster than Marceline is.
    • Any character that is female, young, and has a fit humanoid body, including Celina, Doctor Princess, Jungle Princess, the Nymphs, the Bikini Girls and others, generally for fanart, shipping and Rule 34.
    • Jake's dad, Joshua, seems to be rather popular for how Crazy Awesome he is.
    • Before "Jake the Dad" aired, of Jake and Lady Rainicorn's kids, Jake Jr. seemed to be getting the most attention and concern, because the kid lacks a face.
    • Shoko got plenty of fanart after her debut. Probably because of her sad life and being voiced by Isabelle Fuhrman.
    • Rosalinen from "Puhoy" is also quite popular, in part to the fact that Finn forgot all about her and their children.
    • James from "James" seems to have a very loving fan base as well. It helps that, coupled with his funny mannerisms that he's voiced by Brak.
    • During "Five Short Tables", Ice Queen is revealed to also be writing Gender Flip fan fiction about Fionna and Cake, her fanfic focus on Flynn and Jacques, a gloomy looking boy with bangs covering one eye and wearing formal clothes with his raccoon friend, both got popular instantly. Even Ice President got some fan art and his Gender Flip fanfiction characters, Lynn and Janet also became popular.
  • Epileptic Trees: It's extremely likely that Phlannel Boxingday is actually Princess Bubblegum in disguise: both are pink; have an identical face apart from the mustache; have the same initials and same number of letters and syllables in their first and last name, Boxingday's last lines include Gratuitous German ("In deinem Kopf."), references to being unable to interfere in Castle Lemongrab's policy due to treaties and Techno Babble. The only other possible explanation is that Boxingday is a "sibling" that came from the same pile of goo where she came from.
    • Finn pulled something very similar in "Davey" so she could've had a coach on how to pull it off.
  • Evil Is Cool: Most of the villains are Laughably Evil or harmless or misguided, but some of them manage to cross over into this. Notable examples include the Lich, Fight King, Flame King on his good days and Laser Wizard. Ice King is usually an Ineffectual Sympathetic Villain, but "Isla De Senorita" shows that he can manage surprising badassery when properly motivated.
  • Evil Is Sexy:
    • Ice King's female counterpart, Ice Queen. Presumably, this is to contrast with Ice King's undesirable appearance. Nonetheless, Natasha Allegri said that she made Ice Queen attractive because she thinks attractive villains are scarier. Justified, considering she's the Ice King's Author Avatar.
    • Many fangirls see Marshall Lee in this light. It's debatable whether he's genuinely evil or just mischievous, but he's much more threatening than Marceline is, and he's also more explicitly enticing and flirty.

     F-M 
  • Family-Unfriendly Aesop: Generally intentional:
    • "Tree Trunks" suggests that you shouldn't encourage people to "follow their dream" if they simply don't have the necessary characteristics for it, as it will probably lead to disappointment or something even worse.
    • The moral of "His Hero" is that sometimes violence can be more helpful than nonviolence. Considering the show's nature, this might be a joke, but it's not entirely wrong. Also a Spoof Aesop, since the actual lesson Finn and Jake took from it was "don't listen to old people".
    • The moral of "Freak City" seems to be that some people are just jerks and that sometimes you have to deal with them. Again, not entirely wrong. Again, doubles as a Spoof Aesop, since the stated moral of the episode is "Magic Man is a jerk".
    • The moral of "All Your Fault" is that having more children than you can feed will create hardship for your family and community.
    • The moral of "Conquest of Cuteness" is that using your cute looks and charm to manipulate others is better than using violence.
    • "Too Old": some people are too far gone to be redeemed, and progress made will sometimes be reversed.
    • "Lady and Peebles": if a guy is making sexual threats against you, you're well within your rights to say no violently.
    • "Ocarina" has Jake deliver a cynical monologue about how the wealthy and powerful change the laws to suit themselves.
  • Fandom Rivalry:
    • With Regular Show, though the creators are colleagues, both shows helped in reinvigorating Cartoon Network after its infamous Network Decay, and there are Adventure Time fans who also like Regular Show (and vice versa).
      • And then it got a crossover (granted in comic book form, but hey a fantastic one nonetheless).
    • And with My Little Pony: Friendship Is Magic, mostly for both being popular kid's shows that have a large adult fanbase.
    • With Steven Universe, Rebecca Sugar's own show. One camp believes the latter to be a more streamlined version with much faster plotting and character exploration. Others thought Rebecca Sugar's departure merely took her talent with her to pour her attention into. Doesn't mean there's not fans of both, and generally fans of the former tend to be of the latter, though the reverse isn't universal across the SU fandom.
    • A very tense one developed with Teen Titans Go!, because when it started airing it quickly became Adored by the Network while Adventure Time was given a more erratic broadcast schedule with no repeats of old episodes. The fact that Teen Titans Go got a theatrical movie, which Adventure Time was supposed to have, only adds fuel to the fire. The show prematurely ending against the production team's wishes doesn't help.
  • Fanon: Whenever you read fan fictions that centers on Princess Bubblegum, you will probably hear the word "Candy Council" where she always discuss with them regarding the current issues on the Candy Kingdom, or how they utterly detested her relationship with Marceline for various reasons and wanted Bubblegum to break up with her ala Naruto's village council. Not only do we have no proof regarding if she even have a council in her kingdom but she also stated that most of the Candy People are too idiotic to see the bigger picture along with her own tendencies to work alone with only Peppermint Butler to accompany her.
  • Fanon Discontinuity: "Water Park Prank" has to be the most unpopular episode of the whole show. Besides the off-putting art style thanks to the guest animator, the episode is two 6-minute plots pasted together, with Finn, Jake, and the Ice King all reverting to their Season 1 characterizations.
  • Faux Symbolism: Fans have been relating that scissors incident in "The Lich" to Finn and PB's general relationship. PB accidentally cutting Finn supposedly represents PB hurting Finn without intending to, something she's been doing frequently. Finn trying to gain PB's gem and her telling him to back off supposedly represents her rejecting Finn's love, and in the process, unintentionally hurting him.
    • The catcher's mitts from "You Made Me" inspired a load of theories on the nature of their existence and their symbolism. Thomas Herpich, the writer of the episode, refused to tell the fans what they meant, because A) he wanted it to be mysterious, and B) he found the fan theories to be fascinating. However, the lead character designer, Andy Ristaino, later revealed the symbolism of the mitts on his Formspring. As it turns out, the real symbolism was so complicated and strangely obvious that no one would have guessed what it actually was!
  • Fountain of Memes: Several of the characters. Finn, obviously, in seasons 1 and 2.
    • Jake still appears to be this.
    • Ice King and Lemongrab, for their tendency to say very strange and unsettling things.
  • "Funny Aneurysm" Moment:
    • After "Holly Jolly Secrets," anything the Ice King has ever done that was meant to be funny could be called this, as all of his antics are the product of a deteriorating mental state.
    • The scene of PB pushing Lemongrab onto the floor and making him cry becomes cringe-worthy when it's revealed later on that Lemongrab thinks of PB as his mom.
    • Marceline standing outside in the show, staring into the window in "Holly Jolly Secrets II" is a punch in the heart now that it's revealed that Marceline was once a daughter figure to the Ice King, and had to watch him lose his mind.
    • At the end of Too Young, Lemongrab leaves on his camel, looking miserable and sulky, muttering to himself as he returns to his home. Then we find out later that he has no friends, or anybody, back home.
    • Jake joking in "Jake the Dad" that his kids are grown up. But in "Puhoy," when BMO reminds him of this, we see him struggling not to cry.
  • Genius Bonus:
    • There is such a thing as an enchiridion. This also counts as Bilingual Bonus. Enchiridion is a Greek word (although spelled differently) meaning, among others, 'manual'. It is also Latin (spelled as written in the episode) for "handbook."
    • The cat that knows "where you might be" might be a reference to Schrödinger's Cat.
    • The White Mask of Doom Princess Bubblegum wears in "What Have You Done," is the mask the Beak Doctors wore during the times of the Black Plague.
    • PB's chalkboard in "Too Young" describes and demonstrates the Big Bang. Also counts as Freeze-Frame Bonus.
    • Princess Bubblegum instructs Marceline "begin playing triplet quavers in mixolydian mode," which is just full of advanced music lingo known only to those who have studied music at a college level.
    • During the video of the fight between Marceline and Finn in "Daddy's Little Monster," Jake gets hurt and shouts "Ow, my hippocampus!". The hippocampus is the part of the brain that contributes to forming long-term memories, so Jake was right when he said "That explains why we got amnesia."
    • A chalkboard in "Goliad" shows a molecular line diagram for the molecule carbon trioxide. Not much of a Genius Bonus if you paid attention in high school chemistry.
    • "Ignition Point" borrows heavily from "Hamlet". The voice Finn and Jake hear through the vents is reciting lines from the play.
    • In "Friends Forever", when Ice King says he wanted Drawer Dresser to be his improv coach, Drawer Dresser replies "Yes, and?"
  • Growing the Beard: The third season and beyond has better animation, more serious tones, more Character Development, more Story Arcs and emphasis on continuity (though comedy is still paramount) and less Idiot Ball. This could be also said to start with the second season's two-part finale. There's more episodes not focusing on Finn and Jake, and fleshing out other characters or the world itself.
  • Harsher in Hindsight:
    • Ricardio the Heart Guy, an obsessive stalker voiced by George Takei, now seems in incredibly poor taste after allegations of sexual harassment came out against Takei in 2017 following the blow up of the #MeToo movement.
    • So Marceline's dad just ate her fries. Doesn't seem like it's bad enough to refuse to talk to him ever again, right? But in "Memory of a Memory" we see the fries he was eating were in a broken-down abandoned diner after the apocalypse. Chances are food of any kind was scarce and teenage nonvampire Marceline probably needed them more than her deathless father...
    • Related to the above: In the Fionna and Cake episode, Cake wore the Ice Queen's tiara and Fionna knocked it off Cake's head, yelling, "No! You might catch her crazy!" As "Holly Jolly Secrets" revealed, the Ice King's crown caused him to go crazy. And the whole episode is a Fan Fic by the Ice King... so he knows to a certain extent that he is not the person he used to be. Similarly, at the end of "The Eyes," Ice King, after spending the entire episode spying on Finn and Jake to learn the secret to happiness, ends the episode with the line "I'm...still not happy". Sad enough in context, but after all the revelations concerning his past, it starts to seem like he is subconsciously aware of what he's lost, on some level, and cannot be happy because of it.
    • "Too Young," viewed as the creators of the show intended, is an episode that goes from funny to heartwarming to rather dark. However, when viewed from the failed experiment Lemongrab's point of view, it's depressing.
    • An upset Lemongrab left at the end of "Too Young," and came back a year later. He mentions that his castle has no citizens. According to Word of God, the only people in his castle are his servants, and he has no friends. When Lemongrab goes home in "Too Young," he's returning to a life of near-total isolation.
    • Even though Lemongrab is really unlikable in it, "Too Old" makes it painful to rewatch "You Made Me!" After the events of "You Made Me!," Lemongrab becomes a happy, adjusted person who has a wonderful friend, and a creator who worries about him and cares about his feelings. Watching "Too Old" after watching "You Made Me!" is going right back to square one, back to Lemongrab's angry, isolated, self-loathing, sad, friendless, lonely life- and Princess Bubblegum reprimanding him and bullying him when he ends up royally sucking at his job.
    • Ash selling Hambo to that witch. It was revealed in "I Remember You" that Simon Petrikov gave child Marceline Hambo when she was scared and alone in the post-apocalyptic wreckage. Just when you thought you couldn't think of Ash as more of a dick.
    • While Marceline's journal song is already pretty harsh, given that she's admitting to being lonely, hating being immortal and pushing people away so that she won't get hurt, but there's one line in particular that becomes unbelievably heartbreaking after watching "I Remember You":
      Marceline: (singing) They don't know what it's like to live forever and forget who they even are...
    • Similarly to the above, Marceline's line about not having friends was a Tear Jerker to begin with, and then it's revealed that she grew up in an irradiated, post-apocalyptic wasteland. She probably didn't have friends because she and Simon were the only survivors around.
    • Many of the strange events in "King Worm" become this after the end of season 4. Hint: Dreaming of Things to Come. Watching the episode again becomes downright disturbing.
    • In "All Your Fault," it is revealed that Lemongrab has suicidal thoughts. Remember the scene in "Too Young" where he walked out of a window? Or the scene in "You Made Me" when he purposefully fell out of one? Yeah.
    • All of the scenes of Lemongrab and his brother loving each other are really cringe-worthy to watch now that Lemongrab has partially eaten his clone, and is now abusing him verbally.
    • The Season 1 episode, "Donny" is about an obnoxious bully named "Donny" who keeps evil outsiders at bay by being a bully to the people in his town, and this is portrayed as a good thing in the long run. This can feel uncomfortably like xenophobic Alt-Right propaganda in the era of Donald Trump.
  • He Really Can Act:
    • Jeremy Shada had already proven himself to be quite the capable voice actor, especially considering his age, but his performance as Finn Mertens after he takes the crown and loses his mind in "Finn The Human" was absolutely chilling.
    • Tom Kenny, who is mostly known for Spongebob and other comedic and petty-type roles, got this reaction with Simon Petrikov's final tapes in "Holly Jolly Secrets" and the Ice King crying in "I Remember You."
    • Justin Roiland with Lemongrab running into the night wailing in sadness in "You Made Me", Lemonjon's sudden onset of compassion in "All Your Fault" and the brief speech given by Lemongrab 2 in "Too Old".
    • Andy Milonakis sounds youthful and likable whenever he appears as NEPTR.
    • Ron Perlman as The Lich. Seriously, his "Fall." speech in "Escape from the Citadel" is the prime example of how good Perlman's work is.
  • Heartwarming in Hindsight: "The More You Moe, the Moe You Know" was the last episode to feature BMO's creator Moe and ended with BMO reflecting on his right of passage after defeating AMO to avenge Moe. In light of the passing of Moe's voice actor Chuck McCann, the episode comes off as a touching send-off to Chuck McCann.
  • Hilarious in Hindsight:
    • Many people complained that "Incendium" felt short and should've been a two-parter. Turns out that the season 4 premiere continues directly from where "Incendium" left off, so the two episodes may as well be considered parts of the same episode!
    • Pen once lamented on the fact that he had to cut a high five from an episode. It turns out that the crew must really like high-fives since this clip from "Five Short Graybles" includes a sequence full of needlessly awesome high-fives.
    • This image becomes a lot more relevant after watching "Lady and Peebles".
    • Justin Roiland (Lemongrab's voice actor) apparently predicted the plot of "All Your Fault" (and parts of "You Made Me") two years before the episode aired, in a strange freestyle rap from his podcast. It's uncanny to say the least.
    • In the Japanese dub, Finn is voiced by Romi Park, who is Korean-Japanese and speaks both languages as well. And he can't understand Lady Rainicorn. Even more hilarious (and ironic) she also voiced by another Korean-Japanese actress, Bong Young-hi.
    • This is not the first time Romi Park voiced a short, blond kid hero who loses his right arm and replaces it with a mechanical prosthetic. Perhaps Finn should consider himself lucky that he didn't also lose his leg and Jake's body...
    • Lemongrab's very first line in the show was "This castle is in unacceptable condition!" In the episodes "All Your Fault" and "Too Old," his castle is in very unacceptable condition.
    • Some fan art reinterprets Me-Mow as either having a more humanoid figure and/or being much taller. Several seasons later, when she does finally appear again, she's taller than Finn and has a feminine shape clearly more like a young woman rather than a Funny Animal.
    • Cloris Leachman voices an elderly undead creature whose Famous Last Words while in her skeletal form was "I Warned You, you butt" right before she gets decapitated by the protagonist. Leachman would later on play another elderly undead creature in the form of a zombified Crazy Cat Lady whose scene involves toothlessly nibbling on a protagonist's butt also right before she gets decapitated by a protagonist in Scouts Guide to the Zombie Apocalypse.
    • In "The Cooler", Princess Bubblegum infiltrates the Flame Kingdom so she can disable their weapons of mass destruction before the Always Chaotic Evil country can use them against hers only to get caught by Flame Princess, nearly starting the very war she was trying to avoid. In Attack on Titan MAJOR SPOILERS it's revealed double-agents infiltrated the walled city so they could prevent the "evil" humans inside (defectors fleeing persecution and potential persons of mass destruction) from using their hidden weapons of mass destruction. The attack winds up exposing the weapons to the civilians who didn't know about them, the enemy country, or anyone existing outside their walls, panicking the only person in the whole city who knew how to use the weapons into passing his power to another, and giving that person many, many, many reasons to attack the agents' country. Additionally both PB and the double-agents should know their "enemy" isn't planning on attacking anyone but they think they're clever enough to risk provoking them anyway.
    • Finn's father Martin was jailed for years as a cosmic criminal, for about the same amount of time Finn's mother Minerva kept nearly all the remaining humans on Founders Island — essentially as a jailer.
    • In "Preboot," Dr. Gross says that the next logical step forward for human body modification is "scissor-hands and telescopic spider-legs." Fast-forward to 2018, and it seems that Mac Gargan took her advice to heart.
    • One of Cartoon Network's blocks in 2016 paired this show with Regular Show in a block titled "Regular Time Adventure Show" with a catchy rock song for the promos. In 2017, the two shows were given their own Crossover comic, Adventure Time X Regular Show.
    • In "Her Parents", Jake nervously greets Rainicorn's parents with a gratuitous "Annyeonghaseyo" (Korean for "Hi" or "Hello"). Years later, thanks to the surge of popularity towards South Korean culture due to K-Pop, "annyeonghaseyo" has become something of a meme among K-Pop fans.
  • Hollywood Pudgy: Fionna. She was designed to be "chubby cute" according to her designer, Natasha Allegri, and certainly appears to be thicker in the concept art, but she looks a lot slimmer in the show. In concept sketches by Natasha Allegri and Rebecca Sugar, she looks genuinely plump, but she looks very average in the show.
    • Also fits with Finn and Flame Princess.
  • Idiot Plot:
    • "Heat Signature" revolves around Finn and Jake being tricked far too easily into thinking they've become vampires.
    • "All Your Fault" was about the Lemongrabs (and all of their children) almost starving to death because the Lemongrabs made all of their food into children. Even when they were given help, they still messed it up. It took PB removing the Candy Life formula from their heads to make them stop.
  • Incest Yay Shipping: The Lemongrabs, fullstop. The revelation that the two are brothers surprisingly heightened the desires of Lemongay shippers.
  • Internet Backdraft: With Season 7 many fans are unhappy how Cartoon Network counted the episodes. Fans assumed that "Preboot/Reboot" was the Season 7 finale... until the DVD came out and only had 25 episodes on it, ending with "Thin Yellow Line". On that note many fans were disappointed how there was no Blu-Ray boxset only a DVD. Same goes for the Final Seasons compilation, which includes the second half of Season 7, Season 8 and the final season.
    • On April 30th, Cartoon Network released a Complete Series boxset containing all the episodes from the series. The problem: it was released on DVD, and all the episodes are on 480p resolution. Fans were not happy about this at all, especially since the first six seasons were released in Bluray, with every episode included in high resolution. Not only that, but most of the special features from the previous releases such as commentaries from Pendleton Ward and the production crew are missing alongside the "Frog Seasons", "Graybles Allsorts" and "The Wand" shorts.
      • The criticism also applies with the Complete Soundtrack, which was released at the same time. Excluding the finale which has its own soundtrack, most of the songs from the soundtrack are missing (such as Marceline's cover of Mitski's "Francis Forever") and for some unexplained reason, censored (examples including "BMO's Pregnant Song" and "Baby's Building a Tower Into Space")
  • It's Short, So It Sucks!: "Betty" is an episode that a lot of people feel really should have been a two parter. Given that it deals with Ice King's lost love making her way to present day Ooo, many feel that the episode goes by too fast considering what an important event it deals with.
  • It Was His Sled: It has become general knowledge that the Ice King used to be a human named Simon Petrikov, and that he raised Marceline for a time. Something that took time to build on in the show.
  • Jerkass Woobie:
    • The Ice King. He really does seem to just want a nice wife and make her happy. His modus operandi, on the other hand... Not the mention his hideously frightening and miserable backstory.
    • Lemongrab. As hateable as he is, you kinda feel sorry for him. Fortunately, he got a happy ending as Lemongrab 3.
    • Magic Man. It was heavily implied in "Sons of Mars" that he was a relatively decent person once, and loved his girlfriend dearly. But when she died, he turned into a near-sociopath, inflicting horrible chaos onto people for his own amusement. As much of a bastard as he is, the scene of him caressing her picture, saying her name softly shows there was humanity in him once.
    • Donny. Throughout his episode, he went from a jerk to a nice guy. Then, he was bullied back into jerkdom, and revealed at the very end that he still cares about Finn and Jake, even though his life requires him to be a jerk to everyone.
    • The Pup Gang from "You Made Me!". Even after all they've done, they didn't deserve getting electrocuted that many times.
    • The Door Lord. Yeah, he stole everyone's stuff, but did he really deserve to get the shit beaten out of him and get tied to a chair?
    • Clarence. He killed Ghost Princess, but like Achilles, he fell in love with her as she died and killed himself over it.
  • LGBT Fanbase:
    • Marceline/Bubblegum is highly favored within the LGBT community, as well as their genderswaps.
    • As of "You Made Me!," so is Lemongrab/Lemongrab clone, and again, with their genderswaps.
      • But not so much as of "Another Five Short Graybles" and "Too Old."
    • Princess Cookie to the transgender community.
    • A con panel confirmed that BMO is genderfluid.
  • Love to Hate:
    • The fanbase takes a real liking to the dreaded, unfunny, dark, murderous and with No Sense Of Humour terror that is the Lich, mainly because he took such a drastic turn from the show's usual silly tone. The base was intrigued with him long before he made his first full (non-cameo) appearance in season 2. The love got boosted when he cleverly outsmarted Finn in the season 4 finale by exploiting his heroic traits and using them against him.
    • Magic Man. Mainly because he's funny, despicable and scary at the same time.
    • Lemongrab. An awesomely creepy, nightmarish, weird character who moved all the season 5 into Darker and Edgier territory.
    • Big Destiny as well. Despite being a greedy bully, he's entertaining to watch and has some memorable lines.
    • Also, he fought a bear!
  • Memetic Molester:
    • Lemongrab is starting to appear like this, after the summary of "You Made Me!" revealed that Lemongrab peeps on Princess Bubblegum and the Candy People while they sleep. Lemongrab watches you while you sleep.
    • Lemongrab has got nothing on The Freak Deer. It's a bizarrely human-like deer that licks people. It doesn't talk or anything, it just licks people.
    • Ice King has been this since the pilot, thanks to his tendency to kidnap princesses and force them to marry him.
  • Memetic Mutation: See here.
  • Misblamed: While it doesn't justify the lack of timeslots in recent years, many have accused Cartoon Network of forcing the show to end early in favor of more Teen Titans Go!, when much of the production staff have indicated that it was ending on their terms, rather than the network's, with Cartoon Network even having given plenty of time to plot out the Grand Finale. note 
  • Moe: Flame Princess when she's being dere-dere. Most especially when she's happy.
    • Gunter and all those penguins are supremely adorable at all times. Too bad the cuteness doesn't last.
    • Prismo, all because of his Adorkable personality and his relaxing, laid-back South Asian accent, plus his [3] adorable reaction to Jake saying he loves him.
    • Finn, and for good reason.
    • BMO is certainly moe, and Flambo even more so. Helped by their cute accents.
  • Moral Event Horizon: See here.
  • More Popular Spinoff: Adventure Time began as a lesser known, if memetic, short from Random Cartoons, as mentioned on the main page.
  • My Real Daddy: Rebecca Sugar has this reputation among the fandom. During her time on the show she provided many episodes that were the first to delve into serious Character Development, brought more attention to the post-apocalyptic elements, and made many memorable songs that are fan favorites to this day. Some have expressed the sentiment that after she left to work on Steven Universe, the show's just not quite been the same without her. This criticism died down over the years after Season 7 premiered.
    • This also applies to Larry Leichliter, the episode director for the first four seasons. His departure early into Season 5 left the series without a consistent director, and more than a few fans have argued that it had an effect on the show's overall quality.
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  • Narm:
    • Lemongrab. Even when his situation and backstory are genuinely Played for Drama, Nightmare Fuel, or a Tear Jerker, he's still a screaming, Large Ham with the voice of an awkward teenager. The sad thing is that even when he's written to be serious, we can't take him seriously because of his rather unfortunate voice.
    • The same applies to the present-day Ice King to an extent in "I Remember You," but it's mitigated by hearing his past self speak in "Holly Jolly Secrets".
    • Finn's battle cries in earlier seasons, back when his voice actor was going through puberty.
    • Farmworld Lich's hand talking... with its fingers. It's bad enough that it is shown to both not need this to talk as well as having shapeshifting powers, meaning that it either has a twelve year's old's idea of being intimidating or that the Lich is a Daffy Duck level egomaniac. Such mystique and wonder for the show's most horrific villain.
    • "Skyhooks II" has a very intense moment where Finn, much like the other people in Ooo, is very close to transforming into an elemental being. As a candy person touches him, starting to put him in extreme agony, Finn lets out his common girlish scream stock sound effect. While it's obvious he'd be terrified out of his mind, considering what it did to those he knew, it still is the same effect he's used when he was snuck up on by Princess Bubblegum and had his nipples twisted by Jake.
  • Nausea Fuel:
    • Ice King's giant pile of boogers in "Holly Jolly Secrets". Just... eugh.
    • Projectile vomiting into people's faces. There were two instances - Jake puking in Finn's face in "Storytelling," and Lemongrab puking in Peppermint Butler's face in "Too Young".
    • Finn and Jake spitting food into each others' mouths in "Jake vs. Me-mow."
    • Barb the spider giving birth in "Web Weirdos".
    • Magic Man's house. The decaying rat in the corner, the mold on the ceiling, and the giant puddle of snot on the floor.
    • "Five More Short Graybles" has Finn and Jake sticking their thumbs into a Surinam toad that's giving birth. Eeuuugh.
    • "Mystery Dungeon" has Lemongrab contemplating eating the Ice King. The Ice King is an old, saggy man who probably smells bad. And Lemongrab wants to eat him. DISGUSTING. Later in the episode, Lemongrab eats a pie out of a giant rat's mouth.
    • Some of the Lemon Children in "All Your Fault" are rather grotesque. Special mention goes to the giant, fat, bush-looking thing that was drooling on the floor and saying "Blauh, blauh" repeatedly. Also the green, fat one who licked Jake's hand. Perhaps the grosses part of the episode was the scene in which newborn Seed-Wad vomits all over himself, and the vomit drips down his little chest and all over the table and floor.
    • The video Ice King sends Finn and Jake in "A Glitch is a Glitch" grossed out just about every viewer. What's worse is when Finn and Jake eat Finn's hair.
    • Morbidly obese Lemongrab in the episode "Too Old." Euuugh... No...
      • To say nothing of Lemongrab 2's state...
    • The intense drooling of bird Finn in "The Food Chain" and his death from malnourishment.
  • Never Live It Down: Even though Princess Bubblegum has committed up to ten questionable acts at the most out of her hundreds of non-extremist benevolent actions, most PB detractors remember her solely for those specific acts of atrocities instead of the overall kind and well-meaning princess that viewers know and love. The character's voice actress has come to view her as a sort of "selflessly evil" type of character, but Black and White Morality is a thing in every fandom.
    • "The Cooler", as well as several events throughout season 6 and 7 have had her undergo Character Development, which has somewhat redeemed her in the eyes of some of her haters.
  • Nightmare Retardant: The Lich's initial appearance in "Crossover". His face is still terrifying, but it does lose some impact when it's attached to the body of a chubby Bulldog.
  • No Problem with Licensed Games:
  • No Yay: In the middle of "I Remember You" Ice King trying to kiss Marceline when she accepts his hug, which she's squicked out by. After seeing "Simon & Marcy," it's clear from her point of view, she might see this as Wife Husbandry.
  • One-Scene Wonder: Many due to the Loads and Loads of Characters, such as Breakfast Princess in "Hitman" and Huntress Wizard in "Reign of Gunters".
  • Painful Rhyme: The song in "Evicted" tries to rhyme 'old' with 'code'.
    Marceline: I'm not mean, I'm 1000 years old/And I just lost track of my moral code.
  • Pandering to the Base: Fionna and Cake started off as a one-shot non-sequitur episode used to further establish the Ice King as a crazy loser, and to mock the concept of fan fiction, and the fanbase, in general. But after Fionna and Cake aired, the fans loved the genderbent characters seriously and unironically. Some fans feel like "Bad Little Boy" was unnecessary, and was only pandering to this part of the fanbase, though the audience-mocking subtext is the same.
  • Paranoia Fuel:
    • "I'M GOING TO TAKE IT FROM YOU WHILE YOU SLEEP."
    • This promo for "The Lich," which features the Lich's horrifying face zooming in on you. This could air during any commercial break between the first airing of "I Remember You" and the first airing of "The Lich," giving your screen a face full of Lich before you know it.
    • The Lich lying dormant in Sweet P. just waiting for an opportunity to come out is enough paranoia fuel, but now that a piece of the Lich has been dropped into every single alternate universe takes paranoia over the Lich Up to Eleven.
    • The Ice King's backstory.
  • Periphery Demographic: Little kids, older kids, teenagers, and adults all are attracted to this show.
    • For having a wide range of female characters with different body types, making fun of pick up artists, the morals of Fionna and Cake episodes, and a scene where Marceline and Finn beat down Ash (Marceline's abusive boyfriend) because of a Stay in the Kitchen comment (and selling Hambo), the show's got a huge feminist following. Impressive considering CN apparently didn't want the show to appeal to women at all.
      • The feminist following seems to be aided by the hints (perceived or real) of Bubbline.
  • The Problem with Licensed Games: Unfortunately this fits the bill with Adventure Time: Explore The Dungeon Because I DON'T KNOW as it is a repetitive, boring and very unimaginative Gauntlet clone, which is especially bad considering the series it's based on. The only thing that really keeps the game from outright Fanon Discontinuity is that it does have the distinction of being canon and the first time we are given Princess Bubblegum's origin story (later corroborated in "Bonnie and Neddy").
  • Replacement Scrappy: Both Gumbald and GOLB are seen as this to the show's former Big Bad, the Lich, in Season 9. Gumbald is considered an uninteresting antagonist that lacks the Lich's menace and coolness. Meanwhile, GOLB, despite being the Lich's superior and the show's Greater-Scope Villain, didn't get a chance to do much due to a lack of screen time and had no real character to speak of, to the point where he came off as a Generic Doomsday Villain. It doesn't help that the Lich often considered one of the best cartoon villains of the New 10's.
  • Rescued from the Scrappy Heap:
    • Flame Princess, after her Freudian Excuse was revealed, and she finally found suitable companionship and became a noticably nicer, sweeter person.
    • Lemongrab 2, Lemongrab's nicer, more empathetic twin. Especially since he dies sacrificing his life in order to save their kids from his brother's tyranny. Fortunately, he was merged with his brother.
    • The events of "The Mountain" have done this for Lemongrab himself. After being combined with Lemongrab 2 into Lemongrab 3, he has mellowed out (and thus yells a lot less), his kingdom is in good order, and he has become at peace with who he is - no longer letting it drive him crazy or blame other people and things for it, and even moving forward at sincere self-improvement. While he is still a Base-Breaking Character, it is a definite step up from the universally reviled monster that Lemongrab 1 had become, to the point where most fans are actually OK with him being a part of the heroic alliance in the Grand Finale.
    • For some, the "Elements" miniseries did this for Lumpy Space Princess, due to her acting less selfish, being generally more supportive of Finn, and ultimately being the one to save the day in the end.
  • Ron the Death Eater:
    • Princess Bubblegum has received a lot of flack from fans over some questionable acts, especially in the fifth and sixth seasons. She does occasionally lapse into morally ambiguous areas in her determination to protect her kingdom, but certain parts of the fandom unfairly view her as a sociopathic tyrant who must be destroyed by any means necessary.
    • Flame Princess sometimes gets this, especially from Fubblegum supporters. Although it's now been revealed that she isn't evil and doesn't want to be, and that she has a pretty good Freudian Excuse for her early behavior, there are still those who persist in portraying her as merely a destructive psycho.
    • Peppermint Butler also gets this to a lesser degree. He may be into the dark arts, but he is still clearly loyal to Princess Bubblegum (he was the only one who followed her when she was dethroned, and keeps weapons (like stakes) stockpiled to protect them) but some fans have gone so far as to accuse him of being pure evil and doing things like brainwashing and mind-controlling Bubblegum just For the Evulz.
  • Seasonal Rot:
    • Some fans had complaints about parts of season 5, particularly with Finn taking a level in jerkass and sabotaging his own relationship with Flame Princess, Lemongrab (who was already a divisive character) getting more involvement in plots, and Princess Bubblegum pushing the boundaries for the grey morality area.
    • Season 6 is arguably the point where the series lost some steam. While critics praised its newfound cosmic, Contemplate Our Navels direction, a lot of fans were put off by this kind of storytelling placing more emphasis on the philosophical and less on the humor. Not to mention that after the premiere (which was very well-received), the resolution with Finn's arm and the lack of focus on plotlines in the first half of the season also put off many people. And once the season's main comet plot got off the ground, it suffered an anti-climactic outcome. It doesn't help that this was after Pen stepped down as showrunner.
    • The final season became this for some fans, especially after seasons 7 and 8. While some of the episodes were praised, many fans considers episodes like "Ring of Fire", "Blenanas" and "Son of Rap Bear" unnecessary for the season. Others criticize Gumbald for not being an interesting and menacing final villain, the half-assed resolution to Jake's shapeshifter plot, some episodes feeling rushed and some questions being left unanswered. And then there's the finale, which ended disappointing some fans due to the lack of closure of Finn's romantic arc.
  • Self-Fanservice:
  • Shipmanteau:
    • "Fubblegum/Bubblefinn" (Finn/Princess Bubblegum) and "Farceline/Finnceline" (Finn/Marceline) show up often in forums. Lately we have "Bubbline/MarceBubble/Marcegum/etc." (Princess Bubblegum/Marceline), though it's usually shortened to Pb/M.
    • Bubblegum and Marceline is also known as Sugarless Gum.
      • This is usually used to denote Rule 34 depictions of their ship.
    • Lemongrab/Lemongrab clone is known as "Lemonzest" or "Lemongay," but without much surprise, it is not called "Lemonparty". In the comics, the name for the shipping of the genderswapped "Lady Lemongrabs" is "Lesbilemon."
    • "Finntress" or "Fintress" for Finn and Huntress Wizard.
  • Ship Mates: Some who were reluctant to ship Princess Bubblegum/Marceline because they didn't want Finn to be alone decided to welcome the Finn/Flame Princess ship with open arms.
    • Some fans also came up with the 'Fubbline' solution, a threesome between the trio. When Flame Princess came along, a few others evolved to 'Flumbaline'. The fanbase adapts, alright.
  • Ship-to-Ship Combat:
    • Finn/Princess Bubblegum vs. Finn/Marceline. This goes double for their gender-swapped counterparts.
    • A third party has risen in the ever-expanding and ultimately victorious Marceline/Bubblegum ship.
    • There may be a fourth candidate in the rising Finn/Flame Princess ship. And after Natasha Allegri designed Flame Princess's gender-swapped counterpart, Flame Prince... welp, The Great Mushroom War might as well be occurring in this fandom.
    • Finn/Flame Princess fans thought they were safe after some teases during Season 6. And then Season 7 introduced Finn/Huntress Wizard.
  • Slow-Paced Beginning: The show can be kind of a slog at first, throwing you into the deep end of completely random humor. It takes a while to build up any real sense of the characters and it isn't until the third season that any serious World Building and backstory was explained.
  • Squick:
    • In "Lady and Peebles," Ricardio clearly has a sexual interest in Princess Bubblegum, saying he wants the "full package" and to be "united as man and wife".
    • Tree Trunks has a crush on Finn. Tree Trunks, by the way, is a very old small elephant woman, while Finn is a young boy. Also 12 at the time of her confession and she's been married multiple times by this point.
      • In Universe (and to many fans) Tree Trunk's full on make-out sessions with Mr. Pig literally everywhere they go in "Dream of Love".
    • Also, the fact that that the Ice King ships Fionna, Finn's Distaff Counterpart, with himself. This is made even more troubling when it's revealed that Fionna is in fact a character in the Ice King's fanfiction about Finn and Jake.
    • Although this was in a platonic, comforting way, Princess Bubblegum leaning close to Finn and putting her hand on his leg in "Burning Low." Out of context, it's just uncomfortable.
    • The nature of the relationship of the two Lemongrabs. It's entirely possible that they're twin brothers, or a couple... or both.
      • The episode "Another Five Short Graybles" confirms that the Lemongrabs are brothers.
    • Bubblegum passionately making-out with her own hand in "A Glitch is a Glitch" to keep from having to date the Ice King.
  • Tainted by the Preview: "The Suitor" was a base breaker from the previews because many people were worried about the character this was not the case as A) PB had no interest whatsoever and B) the episode was a complete deconstruction of Dogged Nice Guy.
  • Take That, Scrappy!: Several examples pop up now and then:
    • For some, it was kind of cathartic seeing Lemongrab in "Mystery Dungeon" having all of his bodily fluids profusely squeezed out of his head as he screams for his mother and almost dies. Some thought he had this coming after what he did in "You Made Me."
    • Also, Tree Trunks doing something very simple: scolding Lemongrab for being an annoying, selfish asshole and telling him, "You'd better be nice!" He lowers his head and apologizes in a much quieter tone. You go, Tree Trunks.
    • Ash getting punched out by Simon in "Betty". He didn't even know who he was. He just wanted to take his flying carpet. If he had known, he'd probably have done worse.
  • They Wasted a Perfectly Good Character:
    • Martin, Finn's father, an effective Hate Sink and Shadow Archetype to Finn with a mysterious backstory. We first meet him when he was in the Citadel for some kind of "Cosmic Crime," the likes of which include killing a god. Clearly this guy is Big Bad material, right? Not so much; he appears on and off during the sixth season, mostly just as a Jerk with a Heart of Jerk conman, before being Put on a Bus without any real backstory revealed, including what he did to wind up in the Citadel. We find out a bit more about him during the "Islands" miniseries, but even then there's a huge gap and it just opens up more Alternate Character Interpretation. Also, given his Put on a Bus status at the end of season 6, you might think that someone like him would be much more suited to make the final sacrifice of fusion-dancing with Glob at the finale, if it meant saving his old world and family and achieving his new mode of existence as the catalyst comet promised.
    • Rattleballs is a badass sword-fighting robot who was made by Princess Bubblegum, and narrowly escaped death at her hands. This connection to PB's colder side would make for great episodes, as would the fact that his introductory episode ends with him deciding to protect the Candy Kingdom from the shadows. But since his introduction, he's only been seen in a small handful of minor cameo appearances.
    • Orgalorg is the true form of Gunther, an Eldritch Abominaton from outer space that has been around since before the Big Bang. The episode of his namesake sets him up as one of the most dangerous and powerful villains in the show, and his Affably Evil personality provides a humorous contrast to said power. He could've been an interesting new Big Bad, but as seen with the Anti-Climax Boss entry above, he is quickly dealt with and is back to Gunther by the end of the episode he appears in. There are a few scattered references to Gunther being Orgalorg every now and then, but it's never truly touched upon again.
    • Maja: her introduction episode left a very strong impression and many were looking forward to what she had planned in the future. Come next appearance most of her plan is already underway, she gets taken out halfway through the episode and a later episode pretty much states she's not coming out of her coma anytime soon. So it's fairly obvious the writers ran out of ideas with her. Doesn't help that said second episode was meant to be a movie meaning she would've had a larger role there.
    • Patience St. Pim for reasons similar to Maja. During her introduction, her backstory and motivations involving getting the other elementals to use their powers was an interesting setup that could have been spun into a more involving plot about her history with the other elementals and trying to rebuild her "friendships" with one another, probably leading to a conflict with the other elementals later on in the series. Instead, she just freezes herself at the end of the elements arc, never to be brought up again, while the supposed conflict role is instead filled by Gumbald, essentially wasting any prior development on the former character for another character that literally pops up just as quickly as Patience vanishes, leaving any potential background and resolution for her elemental sub-plot to be desired...
  • They Wasted a Perfectly Good Plot:
    • Princess Bubblegum being turned into a 13-year old at the end of season 2 would have been a great opportunity to show how a relationship between her and Finn would have worked out, but it was undone after she was in only one episode, before it could be explored in more depth.
    • Maja and her plan to take over Candy Kingdom. They could've built it up, made her an Arc Villain for a season leading to her invasion. Instead her plot is a one and done episode and that's pretty much it for her.
    • The follow-up episode to the elementals arc, Ketchup, recounts Marceline's attempt to save Princess Bubblegum and the rest of the land of Ooo from the influence of the elements, basically ending up with Marceline surrendering to it's effects at the end of her story. This seems to forgo a different potential story arc in which she attempts to find Finn and Jake and warn them of the catastrophe while still fighting off the effects on herself. Had she reached them just as they had found Finn's mother, it could have lead to a potential story arc transition that may have involved a robot of Minerva going along with Finn and Jake to help resolve the potentially world-threatening elemental disaster, along with Susan and Frieda for assistance.
    • From there, Numerous story-writing possibilities exist including:
  • Too Cool to Live: Grob Gob Glob Grod is taken out halfway through season 6 so that they can't prevent Orgalorg's impending return.
  • Ugly Cute:
    • Princess Bubblegum becomes this in "The Duke."
    • The Ice King. He's old, he's got a shaggy beard, a gravelly voice, and a skeletal body. But many fans want to hug him anyway. Some even think he looks cuddly.
    • Some of Marceline's demon forms, for similar reasons to the Ice King.
    • Goliad. A strange "candy sphinx" with a round baby face and the voice of a young girl. Especially fits when she becomes a Creepy Child and extends her third eye.
    • Some fans see Tree Trunks as this at times.
    • The children of the Lemongrabs. Most of them are extremely ugly and horrid-looking, yet there's something strangely endearing about them.
    • The Lemongrabs themselves are seen as cute by more than a few fans. Mostly in an awkward sort of manner.
    • Sparkle the giant deformed baby from "BMO Lost".
    • Martin 2 and the other koala bear people from "On the Lam."
  • Uncanny Valley:
    • Lemongrab's expressionless eyes. If they were more cartoonish and less human, he would be a lot less unsettling to look at.
    • Goliad. She sounds like a little girl, has the head of a baby, and is hell-bent on Mind Raping everyone.
    • The Freak Deer. The combination of intense stare, completely regular deer appearance with tiny grabby hands makes him unsettling.
    • Old Lady Princess when possessed by the Ice King.
      • Old Lady Princess in general.
    • In "BMO Noire," BMO briefly gains a human-looking face that ends up looking Gonkish. Note that BMO has Lemongrab eyes. Those damn eyes are creepy.
    • Despite bringing joy and happiness wherever he goes In-Universe, James Baxter's unnatural bounciness and big horse teeth, combined with how utterly unexplained he is, can kind of weird out viewers.
    • Ricardio, whose face is much more detailed and realistic than the other characters. It's unsettling to say the least.
  • Unintentionally Unsympathetic: Kim Kil Wan in "Ocarina." He's supposed to come across as a Well-Intentioned Extremist who is understandably upset at his father's immaturity and wants him to learn some desperately needed lessons in responsibility. He doesn't by merit of the fact that Jake did try to be a responsible father and most of the disconnect between them is on the children since they aged so fast that they didn't really need a father, he grossly mishandles his plot by not informing Finn and Jake about details they are clearly unaware about but need to know, and that he makes Finn Aesop Collateral Damage when his problem is strictly with Jake.
  • Unpopular Popular Character: Ice King and Magic Man. Also Lemongrab to one side of the base.
  • Viewer Gender Confusion: BMO. Word of God states BMO, being a robot, has No Biological Sex, and is called a "he" more out of convenience.
  • Visual Effects of Awesome:
    • The 3D animation in "Guardians of Sunshine" (all animated by one CalArts graduate) and the fourth-dimensional bubble animation in "The Real You."
    • The portal from "The Lich."
    • The perspective drawings of Lemonjon looking down and walking to the Candy Kingdom, and the incredible animation of Lemonjon exploding and dissolving into thousands of little lemon candies.
    • In-universe, Princess Bubblegum's wax dummy melting in "The Creeps." It's even on the Nightmare Fuel page here for that reason.
    • All of "A Glitch is a Glitch."
    • The wonderful Stop Motion animation in "Bad Jubies". There is even a "making of" video for it.
  • Wangst: Marceline and Lemongrab sometimes lapse into this. When Marceline is upset, she writes angsty songs and plays her bass guitar. When Lemongrab is upset, he screams, cries, and blames everyone around him for his distress.
  • What an Idiot!:
    • Finn and Jake, frequently. "Heat Signature" comes to mind. This has dwindled as time has passed.
    • Ice King in "Hitman."
    • Lumpy Space Princess in "The Monster," when she abysmally attempts to apologize to the villagers, and ends up insulting them instead.
    • Finn completely in "Frost and Fire". To quote The Cosmic Owl: "You blew it."
  • What Do You Mean, It's for Kids?: Despite the PG content and rather mature overtones once in a while, Adventure Time is still very much meant for kids. The writers do a very good job of leaving in enough to imply, but never any literal words to be inappropriate.
  • What Do You Mean, It Wasn't Made on Drugs?: According to the creator: "I'm not stoned; I'm just a naturally stupid person."
    • "A Glitch Is A Glitch" is a particularly egregious example of this. And not necessarily in a positive way. The video Ice King sends to Finn and Jake is like some sort of bad trip.
      • It should be noted that this was done by a guest animator (David OReilly) and was intentionally aired on April Fool's Day.
  • Win Back the Crowd: After CNReal bombed and Adventure Time turned out to be a smash success, Cartoon Network gained a renewed interest in animated series.
    • After Seasons 5 and 6 divided the fanbase with questionable writing decisions and a turn towards philosophical storytelling, the show returned to its goofy roots with Season 7.
    • Thanks to "Islands" and "Elements", Season 8 managed to bring back many viewers who abandoned Adventure Time after the series' Seasonal Rot, as well as bring new viewers to the series.
  • Writer-Induced Fanon:
    • The relationship between Princess Bubblegum and Marceline. Whether intentional or not, the relationship can be interpreted as a friendship that went sour, or a romantic relationship that went sour. Olivia Olsen confirmed that it's the latter. The series finale moves it from fanon to fully canon.
    • It's strongly implied that the Lemongrabs are a gay couple, because they love each other, live together, have no problem with hugging or nuzzling while they're naked, and have children together. But it's never been explicitly confirmed by anyone working on the show, or any of the characters. Then confirmed to be brothers which really sank that ship... and then Lemongrab eats Lemongrab 2.
  • The Woobie:
    • The goblins in "The Silent King" most definitely count as this, particularly Gummy.
    • The Royal Tart Toter. That poor, poor man. Although he's actually pretty damn happy and upbeat, he's completely insane, blind, and deaf. He's still completely dedicated to his job of delivering the royal tarts, even though he's in no condition to, and he's in a mental hospital.
    • Baby-Snaps. As a child, he was in an orphanage. When Princess Bubblegum showed up to cheer up the kids, she asked Baby-Snaps what he wanted to be. He said cheerfully, "I want to be a princess like you!" Princess Bubblegum giggled, thus starting Baby-Snaps's Start of Darkness and Sanity Slippage. Baby-Snaps went crazy and started taking hostages in the kingdom in order to get Princess Bubblegum's crown. He was later chased by guards, and he blissfully fell off a cliff to avoid being captured. He survived, and ended up in a mental hospital, where he was crowned "Princess of the Grass Kingdom."
    • Princess Monster Wife. She was created by the Ice King from the stolen body parts of his favorite princess. The princess was hideously deformed, but a genuinely sweet, damaged character who needed a hug. Although the Ice King constantly told her she was beautiful and wonderful, Finn and Jake and the penguins were continuously repulsed by her appearance. She spent most of the episode crying and questioning her own existence, and she eventually killed herself for the good of the other princesses, by returning their body parts to the rightful owners. It is implied her spirit lives on, though.
    • Prince Huge. He had been transformed into a giant, hideous frog, and the only way to break the spell was with a kiss. So he went around kissing everyone, trying to break the curse. Everyone he encountered assumed he was trying to eat them, and he garnered a reputation for being an evil monster. After learning of his backstory, it's impossible to NOT feel for the guy. His story had a happy ending, though- Finn turned him back into his normal form, and all is well.
    • To a lesser extent, the squirrel from "Up A Tree" qualifies. He admits that the other animals who live in the tree pick on him for wanting to be a flying squirrel. During his conversation with Finn in the jail cell, it's hard not to feel sorry for him.
    • Lemonjon from "All Your Fault" is a HUGE (literally and figuratively) Woobie. When he suddenly gained empathy- he exploded in order to save everyone, including his family.
    • The Magi creature from "Little Dude" qualifies. He hid himself underground so he wouldn't accidentally curse anyone. It's revealed the poor guy had an abusive father who kept calling him a bad wizard.
    • The Lemon Children. They all almost starved to death. One of their brothers is dead. Their dads are the Lemongrabs, and the one who actually loves them is tortured by the other one. Poor little things.
    • Lemongrab 2 is seen by a large portion of the fanbase as a woobie, especially after "Too Old" where he was horribly disfigured and in very bad shape, as well as being horribly abused by his older brother before finally being eaten whole by him while making a passionate speech to his children.
    • Johnnie from "Bad Timing". He was picked on by Lumpy Space Princess when he was in high school (she called him "Ugly Johnnie") despite this he still goes out with her and it seems like they would be a really good match until she goes bat-shit crazy and accidentally traps him in an alternate dimension out of jealousy.
    • Flame Princess in "Earth And Water". Especially after we learn that part of the reason she was locked up for most of her life was because Flame King thought she would usurp his throne. He was so afraid of this happening that shortly after she was born, he had her thrown out into the woods to die.
      • She is also betrayed and one point and her father promises to marry her off in exchange for helping to overthrow her, because (as they acknowledge) the Flame Kingdom is super Shakespearean.
    • Shoko from "The Vault". If her past is to believed, her parents sold one of her arms for a computer, and then abandoned her at a dojo. Then, she's forced to steal from Princess Bubblegum, who is probably her one and only friend, and ends up falling into a radioactive river, mutating into a horrible monster before curling up under a tree to die. And to top it off, her spirit remains restless for possibly thousands of years until she's able to return the amulet she stole from PB by acting through Finn's subconscious.
    • Marceline has gone through some crazy tragic times. First she survives the Mushroom War, and presumably lost her mother as she had to be cared for by Simon in the "wreckage of the world" who is going insane right before her eyes. She also gets turned into a vampire against her will, which kind of forced to remain (as she puts it) "a messed up kid". Then she clearly has a strained relationship with her father, a terrible relationship with her Jerkass boyfriend Ash, a strained relationship with Princess Bubblegum (that they are overcoming), and has to know that many of the people she loves like Finn and Jake will grow old and die before her eyes.
    • Even Finn, considering all the things that happen to him, from getting beaten up all the time, to losing romances, and of course possibly the only human remaining, yet he still keeps an unbreakable happiness. Up until season five anyway, and season six's Breezy is a PG-rated version of depression.
    • Fern, by all account. He's basically Finn, and he's a version of Finn that succumbed to his depression. As a paradox clone of Finn, he's got every single memory Finn had until the point he was created, but he has to live as a self-deprecating grass clone that no one will ever recognize as the original. He can't eat, he can't enjoy anything he did enjoy as Finn, and he has to see Princess Bubblegum, Jake and everyone he knew rooting for Finn, a better version of him who gets to live "his" life. Eventually he snaps, and he tries to get back "his" life by getting Finn's place, just to end up as a bucket of still living freshly cut grass. Gumbald offers him a new lease at life, and he ends up as the Green Knight, a deformed warrior, little more than hired muscle for the new Big Bad. Eventually, he makes amend with Finn and frees himself from the grass demon just to known he's going to die soon because the Grass Demon provided him with a body. He dies, with his last breath asking to be brought to the Tree Fort...that was just destroyed. He barely gets his final wish, as his body turns into a seed, and the seed into a Sacred Tree holding the now restored Finn Sword for Shermy to safekeep.


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