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[[foldercontrol]]

[[folder: A-E]]
* AbandonShipping:
** Some "Fubblegum" shippers sorrowfully tied up their ships and left them at the dock after "Too Young" reveals 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 [[spoiler: canon-in-the-past]] Princess Bubblegum and Marceline ship.
** After the premiere of "Incendium", various shippers (but "Fubblegum" in particular) are leaving 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".
** In-Universe, in the episode "All The Little People" Finn ships and abandons several pairings.
** Most "Lemonzest" shippers stopped shipping the Lemongrabs after "Another Five More Short Graybles" reveals that they are actually [[spoiler: brothers]]. Even more left after the eating and "Too Old".
* AcceptableTargets: Abusive boyfriends or just abusers in general (like Ash, the Party God and Ricardio) always get either killed or have the crap beaten out of them. [[AssholeVictim Nobody's really complaining]].
* AccidentalInnuendo:
** 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..
* AccidentalAesop:
** "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.
* AlasPoorScrappy: If you viewed [[spoiler: Lemongrab 2]] as an example of this, then this trope would definitely hit you when [[spoiler: Lemongrab devours him.]]
* AlternativeCharacterInterpretation:
** [[LackOfEmpathy Based on]] [[EvilLaugh the ending]] of ''BMO Lost'', Jake's indifference towards BMO might be [[{{Jerkass}} deliberate]].
** Ice King:
*** A loser and {{jerkass}} who always tries to force princesses marry him, a tragic {{Woobie}} who just needs a hug and a reason to be happy, [[TakeAThirdOption or]] is [[ChaoticStupid his mind just too muddled]] by [[ArtifactOfDoom 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:
*** Selfish {{Jerkass}} tyrant in need of a good kick in the butt, or a genuinely psychologically [[TheWoobie unstable person]] in dire need of help and kindness, or [[JerkassWoobie both]]? After "You Made Me!," it seems that last one is the most likely.
*** Is Lemongrab a [[RoyalBrat spoiled]], [[EntitledBastard entitled]], UngratefulBastard who received a KarmaHoudini happy ending he didn't even deserve and frequently uses his DisabilityAsAnExcuseForJerkassery, or is he a genuinely [[TheWoobie pitiful]], affection-starved lunatic who ''desperately'' '''needed''' a friend and a legitimate reason to be happy about life? Is Lemongrab a stupid, psychotic (but still inherently neutral) oaf with good intentions?
*** Safe to say he's quite a bit smarter than he would let on, but to what extent? WordOfGod 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 GeniusDitz, as it has been demonstrated in RealLife that autistic people can be incredibly skilled in some specialized areas.
*** Was Lemongrab 2 an insensitive UngratefulBastard for not caring about [[spoiler: Lemonjon]]'s death? Or was he simply stunned and unable to completely process what had just happened? His increase in empathy toward his children afterward (as opposed to his brother) hints at the latter.
*** 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, [[TearJerker 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 [[spoiler: abuse his children and possibly kill 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.
** Magic Man: A complete {{jerkass}} {{Troll}}, a massive hypocrite, a ruthless sadistic bastard, or an insane man mourning the loss of his girlfriend?
** 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 [[spoiler: Simon]] made her out to be, since [[spoiler: 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 [[spoiler: Betty never truly left Simon, [[StableTimeLoop 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 [[spoiler: Has Magic Man's powers]] that we now know is linked to "madness" and "sadness". Is it better for her to [[spoiler: 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 [[spoiler: 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 [[EntitledToHaveYou entitled]] [[StalkerWithACrush stalker]], and was ''way'' too willing to settle down with the [[SexBot 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?
* AndYouThoughtItWouldFail: Many people did. Due to how MS Paint-style-looking and admittedly silly and nonsensical the original short was, it was thought that [[ItWillNeverCatchOn the show would not be that popular]]; but lo and behold, the first episodes got over 2 million views and the viewership is steadily growing.
* AngstWhatAngst: 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 [[spoiler: 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.
*** To be fair, he is plagued by nightmares.
* AntiClimaxBoss: [[spoiler: 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.]]
* {{Applicability}}: "All the Little People" has been interpreted as being one big, long TakeThat to obsessive shippers [[http://www.tv.com/news/animation-round-up-gwen-and-kevin-return-to-ben-10-droid-rage-on-the-clone-wars-and-adventure-time-takes-down-shippers-30199/]] and/or symbolic of Finnís "pubescent sexual awakening," the start of his manipulative side, and/or symbolic of the crew's creative process. [[http://www.avclub.com/articles/all-the-little-people,89314/]]
* AssPull: 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.
** And the fact that he seems to go back to being dumb whenever he's out of the Fire Kingdom. Baking doesn't work that way.
* AwardSnub: Some fans felt that the Adventure Time episode "Too Young" was robbed of the 2012 Emmy by ''WesternAnimation/RegularShow'''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''!
* SugarWiki/AwesomeArt: The title cards are [[http://www.flickr.com/photos/84568447@N00/sets/72157623600706180/ all]] [[http://www.flickr.com/photos/84568447@N00/sets/72157625123405692/ really]] [[http://www.flickr.com/photos/84568447@N00/sets/72157627093517812/ freaking]] [[http://www.flickr.com/photos/84568447@N00/sets/72157629704056521/with/6973621552/ pretty]], and also many of the backgrounds.
* BaseBreaker:
** 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.
** Cinnamon Bun. Some find him to be endeeringly naive as a foil to PB, others just find him obnoxious. This was furthered after he hooked up with Flame Princess.After "Frost and Fire," some people felt [[TheWoobie genuinely sorry for him]] and still like him, while others have come to really be annoyed with his clingy attitude and idiotic moments. Others think he's being an ass, but are glad he's getting called out and is developing more flaws.
** 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 tyrannic monster. The show, on the other hand, 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 other people's immediate needs or feelings.
** Lemongrab: To put it simply, he's either TheWoobie, a JerkassWoobie, or a straight up {{Jerkass}} who needs a swift kick up the butt.
** 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 [[spoiler: causes fellow base breaker Lemongrab to explode]] causes fans to be even more divided by him.
** Neptr. Is he a [[TheWoobie 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 [[TheScrappy annoying useless character]] people would rather soon forget?
* BigLippedAlligatorMoment: [[SurrealHumor Given the]] [[MindScrew nature]] [[WidgetSeries of the show]], there are ''a lot'' of these, be it subtle and small {{Noodle Incident}}s or {{Orphaned Punchline}}s or in-your-face, full blown [=BLAMs=]. Some of the stand-outs are:
** The UsefulNotes/AbrahamLincoln 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."
** In "What Have You Done" when PB flips a table and starts shouting in German before fainting from exhaustion. The table flipping is understandable, but it's never mentioned why she is exclaiming in German.
** Jake's DreamSequence 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...
* BizarroEpisode: "BMO Noire" makes no sense, even by this show's standards.
** "King Worm". Which bizarrely acts like something of a MindScrewdriver for the GainaxEnding 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 ArtShift 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 RealityWarper 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 [[BrokenBase base breakers]] among fans.
* BrokenBase:
** Some people were psyched with the announcement of the GenderFlip episode. Others... not so much.
** Fans who only want [[{{Adventure}} adventurous episodes]] (because the show has "Adventure" in its name) versus fans who want more episodes [[LoveTropes focusing on shipping potential]] and/or just general weirdness. [[http://oi44.tinypic.com/34fxk54.jpg 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 as 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 [[PanderingToTheBase pandering to the fans]], chiefly regarding the existence of [[GenderFlip Fionna and Cake.]]
** "A Glitch is a Glitch" as a lot of people really enjoyed its [[AllCGICartoon unique art style]] and [[AIIsACrapshoot unusually bizarre premise]] while others despise it for the very same reasons claiming [[TheyChangedItNowItSucks 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 the FridgeHorror of [[InsaneEqualsViolent Lemongrab's actions]] [[spoiler: 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 MoralEventHorizon depends on who you talk to.
** The Stakes mini-series for a lot of reasons; such as the perceived [[LesYay Bubbline]] leaning, the feeling the villains didn't get enough screen time, or even that Finn was mostly useless throughout. The biggest point of contention though is easily the StatusQuoIsGod ending, it doesn't help that "Everything Stays" is basically "Status Quo: The Song".
* CompleteMonster: [[BigBad The Lich]] is an EvilSorcerer who desires nothing less than the [[OmnicidalManiac extinction of all life]]. While most of the series' antagonists have sympathetic moments or funny quirks that add levity to their crimes, the Lich is the only villain to always be played [[KnightOfCerebus absolutely seriously]]. His attempts at wiping out all life has included possessing Princess Bubblegum, going OneWingedAngel, and rampaging through the Candy Kingdom; killing and possessing the body of [[spoiler:Billy]] as part of a complex gambit to get a RealityWarper named Prismo to grant his wish for the extinction of all life across TheMultiverse; murdering [[spoiler:dream Prismo]] as well as [[spoiler:Prismo's physical body]], the latter solely ForTheEvulz, then breaking the universe's worst criminals out of their cosmic jail, all in order to create an unstoppable army for himself to lead in wiping out all life, one planet at a time. The Lich is also heavily implied to have been involved with the destruction of mankind and one of the reasons why the show takes place in a world AfterTheEnd.
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* ContinuityLockOut: Susan Strong refers to her people as "Hyoo-man" in her second episode, which sounds exactly like "Human." The term "Hyoo-man" was clarified to mean FishPeople only in [[AllThereInTheManual supplementary materials]]. Anyone who hadn't seen them would be confused, since the difference between Human and Hyoo-man happened to be a plot point that was brought up and discussed.
* CounterpartComparison: Since "Holly Jolly Secrets," viewers have been comparing Ice King to [[spoiler: [[Franchise/{{Batman}} Mr. Freeze]], though the circumstances in which they were separated with their lovers are fairly different.]]
** He is also frequently compared to Lee from VideoGame/TheWalkingDead, since they both [[spoiler: survive the apocalypse, become a ParentalSubstitute to a little girl, and are inflicted with (and ultimately succumb to) some form of TheCorruption.]]
* CrackPairing:
** [[ScrewYourself Finn and Fionna]]. Yes, it exists. 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 [[http://31.media.tumblr.com/5e37291b516522ac5462a97bb4f5dba2/tumblr_mrl8o4nZOv1rnfakbo2_500.jpg fans]] have [[http://31.media.tumblr.com/d1fcf1102bea3db331104ff4809a1ec7/tumblr_mrl76d0ryl1rnfakbo1_500.jpg decided]] to [[http://media.tumblr.com/26957963191cf48d6fa072e4900945c3/tumblr_inline_mrl72c3Q7B1r4lq9g.png ship]] Morbidly Obese Lemongrab with [[http://magusthepropagation.tumblr.com/tagged/YES-I-TAGGED-THIS-SUBMISSION-SO-FUCKING-WHAT-ITS-GR9 his pudding]]. Also counts as a CargoShip.
* CrazyAwesome: 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.
* CreepyAwesome:
** 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.
** [[VileVillainSaccharineShow The Lich.]] He's the BigBad of the show, and is so scary that he's somehow amazing.
** [[CreepyChild Goliad]]! A cute candy sphinx with a baby face and the voice of a little girl, who mind-controls people using her psychic powers.
** [[RealityWarper MAGIC MAAAN]]!!! He's funny ''and'' scary, at the same time. 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 [[BodyHorror turned inside out]], and flops away.
** [[BeatStillMyHeart 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.
* CriticalDissonance: Season 6 received praise for its newfound [[GoingCosmic cosmic]], ContemplateOurNavels nature, citing it as an example of the show's growing maturation. However, Season 6 is considered to be LoveItOrHateIt by fans for the same reasons. Many were put off by the show's newfound philosophizing and considered the new direction pretentious, ridiculous and [[AntiClimax Anti-climactic]], complete with the stereotype that after Pen stepped down, the writing was taken over by [[{{Hipster}} Hipsters]] with too much ProtectionFromEditors.
* CrossesTheLineTwice: 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...
* CryForTheDevil: It's easy to feel sorry for the Ice King at times, especially after we learn [[spoiler:[[FreudianExcuse his past life as Simon Petrikov and losing his beloved fiancée]]]].
** Surprisingly The Lich can get this at times. Firstly, because it is implied (and all but proven) that he is formed by simply being unfortunate enough to have been nearest to the detonation of the Mushroom Bomb, implying that he was probably a normal being not [[OmnicidalManiac horribly bent on destruction]] before he was hit. This is taken even further when he is transformed into a baby (Sweet P.) after being "healed" in Season 5's finale, suggesting he may have actually been a baby when it happened. Sweet P. himself gets this after it's shown [[spoiler: The Lich still lies dormant in him]] just waiting to come back out.
* DesignatedHero: Jake, arguably. He's pretty lazy sometimes and he has stolen on more than one occasion, and outrightly discouraged some altruistic actions a few times.
* DieForOurShip:
** Flame Princess got initially just for being a ThirdOptionLoveInterest 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 [[spoiler: 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 [[LauncherOfAThousandShips 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 [[EnsembleDarkhorse Marceline]] gets hit occasionally.
** After "Too Young," a LOT of fanart depicting Lemongrab's demise sprung up on the internet.
* DracoInLeatherPants:
** 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 NotSoHarmlessVillain (like "Princess Monster Wife" followed "Holly Jolly Secrets")
** Lemongrab.
*** Although, considering his AxCrazy behavior and his extreme change in physical appearance in "Too Old," this is very divisible now.
** Ash, too, for the [[AllGirlsWantBadBoys same reason]] Marceline ignored his bad traits: He's a punk rocker bad boy.
** Hunson Abadeer is the closest thing to Satan, [[DystopiaJustifiesTheMeans rules the Nightosphere in a state of chaos and disarray]], and [[EvenEvilHasStandards his love for his daughter Marceline]] is his sole redeeming trait. Fandom tends to portray him as a BumblingDad, probably because he's a light parody of one.
** In Universe example in "Nemesis" where the members of the Veritas Brigade refuse to believe Peace Master when he says Peppermint Butler is the real evil one (over Princess Bubblegum) and defend him even after witnessing Pep But trying to stab him. Why? Because he's adorable and their "bro", he can't really be evil and if he is it doesn't matter.
* DryDockedShip: 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 ''WesternAnimation/StevenUniverse'', ''Clarence'', and ''TheAmazingWorldOfGumball'' have shown that it can be done with little to no controversy[[note]]besides being edited/altered on international airings in countries that aren't as tolerant of homosexuality as North America is[[/note]]).
* EarWorm: Jake's bacon pancakes jingle is extremely catchy, especially [[https://www.youtube.com/watch?v=4v4b6zc_yG4 set to the tune of]] "Empire State of Mind".
** Balloon Music
* EnsembleDarkhorse:
** Marceline became equally as popular as the lead characters despite only appearing a couple of times in the first season.
** The Lich got a ''lot'' of attention from fans before he even appeared in the show, mostly for a really, really cool design.
** The ENTIRE {{Gender Flip}}ped 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 [[TheVoiceless silent]] [[TheCameo cameo]]. The episode dedicated to him exceeded his popularity a billion fold, especially because he's genuinely much more of a mischievous, traditional [[TheTrickster 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 [[RuleThirtyFour Rule 34]].
** Jake's dad, Joshua, seems to be rather popular.
** Magic [=MaaaaAAAAN=]!
** Prismo is widely cherished by the entire fanbase, mainly due to his ridiculously endearing personality and charming pink color, his ''YumeNikki''-esque look AND the fact that he's voiced by a Pakistani-American guy.
** Before "Jake the Dad" aired, [[spoiler: of Jake and Lady Rainicorn's kids, Jake Jr. seemed to be getting the most attention and concern, because the kid lacks a face.]]
** Betty is depicted in a lot of fanart, even before [[spoiler: her arrival in Ooo and she turned out to be a ''{{Badass}}''.]]
** Shoko got plenty of fanart after her debut. Probably because of her [[TheWoobie sad life]] and being voiced by IsabelleFuhrman.
** 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 [[WesternAnimation/SpaceGhostCoastToCoast Brak]].
* EpilepticTrees: 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 GratuitousGerman ("In deinem Kopf."), references to being unable to interfere in Castle Lemongrab's policy due to treaties and TechnoBabble. 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.
* EvilIsCool: Most of the villains are LaughablyEvil or [[HarmlessVillain 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, Magic Man, and Laser Wizard. Ice King is usually an IneffectualSympatheticVillain, but "Isla De Senorita" shows that [[CrouchingMoronHiddenBadass he can manage surprising badassery]] when properly motivated.
* EvilIsSexy:
** Ice King's female counterpart, [[http://www.flickr.com/photos/84568447@N00/5818798956/in/photostream/lightbox 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 [[LampshadeHanging attractive villains are scarier.]] Justified considering [[spoiler:she's the Ice King's AuthorAvatar.]]
** 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, and he's also more explicitly enticing and flirty.
** Marceline, as well. While their wickedness is a debatable in recent episodes, still counts. Now, she is more of an AntiHero.
[[/folder]]

[[folder: F-M]]
* FamilyUnfriendlyAesop: 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 (see BrokenAesop), this might be [[SpoofAesop a joke]], but it's not entirely wrong. Also a SpoofAesop, 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 SpoofAesop, 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.
* FandomBerserkButton: Especially with the show getting darker and taking more advantage of the post-apocalyptic setting, fans get really angry with claims that "...only stoners could like/create this show".
* FandomRivalry:
** With ''WesternAnimation/RegularShow,'' though the creators are colleagues, both shows helped in reinvigorating CartoonNetwork after its infamous NetworkDecay, and there are ''Adventure Time'' fans who also like ''Regular Show'' (and vice versa).
** And with ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', mostly for both being popular kid's shows that have a large adult fanbase.
** With ''WesternAnimation/StevenUniverse'', 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.
* FandomSpecificPlot:
** Most Flinn ([=Finn/Flame Princess=]) shipping fan fictions will have Finn either genuinely visiting her as friends or return to her after years of separation mostly by PB entrusting the reluctant human on a visit on to the kingdom, inevitably reconciling their differences and hooking up again in the process.
** Anytime Flame Princess's [[BrutalHonesty honesty policy]] is brought up, fandoms will often point out the downsides of such policies such as how it indirectly caused the separations of families as a result of giving their own honest comments regarding the other people around a couple, or how most people are unable to earn their money as a result of being unable to bargain or hide from the authority. The final result depends what fanfic you would be reading; Flinn shipping fic or supporters of FP will have her realize the problems and subsequently drop such policies without further complications. [[RevengeFic Anti FP]] or DarkFic on the other hand, will have her Fire Kingdom cause a rebellion against their own queen and subsequently overthrows her whole kingdom, with most people declaring her father as a better ruler than Flame Princess ever did.
* {{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 [[LesYay relationship]] with Marceline for various reasons and wanted Bubblegum to break up with her ala Manga/{{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.
* FauxSymbolism: 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 [[EpilepticTrees 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 [[IJustWantToBeNormal what it actually was]]!
* FountainOfMemes: 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.
* FunnyAneurysmMoment:
** 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.
* GameBreaker: Flame Princess invokes this trope in Vault of Bones. Where Finn was going through the motion of searching for the correct way, Flame Princess could simply destroy or burn anything in her way.
* GeniusBonus:
** There is such a thing as an [[http://en.wikipedia.org/wiki/Enchiridion enchiridion]]. This also counts as BilingualBonus. 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 [[http://en.wikipedia.org/wiki/Schrodenger%27s_cat Schrödinger's Cat.]]
** The WhiteMaskOfDoom Princess Bubblegum wears in "What Have You Done," is the mask the [[http://en.wikipedia.org/wiki/Beak_doctor_costume 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 FreezeFrameBonus.
** 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 "[[OwMyBodyPart 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 GeniusBonus 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 [[https://en.wikipedia.org/wiki/%22Yes,_And%22_rule "Yes, and?"]]
* GrowingTheBeard: The third season and beyond has [[AnimationBump better animation]], more [[CerebusSyndrome serious tones]], more CharacterDevelopment, more [[StoryArc Story Arcs]] and emphasis on [[ContinuityNod continuity]] (though comedy is still paramount) and less IdiotBall. 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.
* HarsherInHindsight:
** 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 [[spoiler: 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 [[spoiler: [[SanitySlippage caused him to go crazy]]]]. Now the whole episode is a FanFic by the Ice King... so he knows to a certain extent that [[spoiler: he is not the person he used to be]]. Similarly, at the end of "The Eyes,"[[spoiler: Ice King, after spending the entire episode spying on Finn and Jake to learn the secret to happiness, ends the episode with the line [[YankTheDogsChain "I'm...still not happy".]]]] Sad enough in context, but after all the revelations concerning his past, it starts to seem like [[spoiler: 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 WordOfGod, the only people in his castle are his servants, and he [[FriendlessBackground has no friends]]. When Lemongrab goes home in "Too Young," he's returning to a life of [[GildedCage near-total isolation]].
** Even though Lemongrab is really hateable 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 ''[[TyrantTakesTheHelm royally sucking]]'' at his job.
** Ash selling Hambo to that witch. [[spoiler: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 [[TearJerker/AdventureTime 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 TearJerker to begin with, and then it's revealed that she [[spoiler: 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 [[MindScrew strange]] events in "King Worm" become this after [[GainaxEnding the end of season 4.]] [[spoiler:Hint: DreamingOfThingsToCome. Watching the episode [[ReWatchBonus again]] becomes [[NightmareFuel/AdventureTime 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? [[FridgeHorror Yeah]].
** All of the scenes of Lemongrab and his brother loving each other are really cringe-worthy to watch now that Lemongrab has [[spoiler: partially eaten his clone, and is now abusing him verbally]].
* SugarWiki/HeReallyCanAct:
** Jeremy Shada had already proven himself to be quite the capable voice actor, especially considering his age, but [[GrowingTheBeard his performance]] as Finn [[spoiler:[[AlternateUniverse Mertens after he takes the crown and loses his mind]]]] in "Finn The Human" [[SugarWiki/MomentOfAwesome was]] [[NightmareFuel/AdventureTime absolutely]] [[TearJerker/AdventureTime 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 [[spoiler: Lemongrab 2]] in "Too Old".
** Andy Milonakis sounds youthful and likable whenever he appears as NEPTR.
* HilariousInHindsight: 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 [[TwoPartEpisode parts of the same episode]]!
** Pen once lamented on the fact that he had to [[http://twitter.com/#!/buenothebear/status/28267009250689025 cut a high five from an episode.]] It turns out that the crew must really like high-fives since [[http://www.youtube.com/watch?v=P_GNy2kIa68 this clip from "Five Short Graybles"]] includes a sequence full of [[MundaneMadeAwesome needlessly awesome high-fives]].
** [[http://media.tumblr.com/tumblr_m9398qbuaH1rqdl22.png 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 [[http://www.youtube.com/watch?v=C-eOw6W7Vxc a strange freestyle rap from his podcast]]. It's uncanny to say the least.
** In the Japanese dub, Finn is voiced by RomiPark, who is Korean-Japanese and speak both languages as well. And he can't understand Lady Rainicorn. Even more hilarious (and ironic) she also voiced by another Korean-Japanese actress, [[CelebrityVoiceActor Bong Young-hi]].
** 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 FunnyAnimal.
** [[spoiler:Cloris Leachman voices an elderly undead creature whose FamousLastWords while in her skeletal form was "IWarnedYou, 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 CrazyCatLady whose scene involves toothlessly nibbling on a protagonist's butt also right before she gets decapitated by a protagonist in ''Film/ScoutsGuideToTheZombieApocalypse''.]]
* HollywoodPudgy: 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 [[http://adventuretime.wikia.com/wiki/File:342352424523523523.png in the show]]. In concept sketches by [[http://adventuretime.wikia.com/wiki/File:Tumblr_mbp61aK0cO1qzlgkno1_500.jpg Natasha Allegri]] and [[http://adventuretime.wikia.com/wiki/File:New_Ep_Artwork.jpg Rebecca Sugar]], she looks genuinely plump, but she looks very average in the show.
** Also fits with Finn and Flame Princess.
* IdiotPlot:
** "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.
* IncestYayShipping: The Lemongrabs, fullstop. The revelation that the two are brothers surprisingly heightened the desires of Lemongay shippers.
* ItsShortSoItSucks: "Betty" is an episode that a lot of people feel really should have been a two parter. Given that it deals with [[spoiler: 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.
* ItWasHisSled: It has become general knowledge that [[spoiler: 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.
* JerkassWoobie:
** 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 [[BackstoryHorror hideously frightening and miserable backstory.]]
** Lemongrab. As [[TheScrappy hateable as he is]], you kinda feel sorry for him. Now, in "Too Old," he is in complete WoobieDestroyerOfWorlds territory when taking everything, including what was revealed in the second video game, into account.
** 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. [[spoiler:He killed Ghost Princess, but like [[TheIliad Achilles]], he fell in love with her as she died and killed himself over it.]]
* LGBTFanbase:
** Marceline/Bubblegum is highly favored within the LGBT community, as well as their genderswaps.
** As of "You Made Me!," so is Lemongrab/[[spoiler: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.
* LoveToHate: The fanbase takes a real liking to [[TheDreaded the dreaded]], [[KnightOfCerebus unfunny]], [[VileVillainSaccharineShow dark]], [[OmnicidalManiac murderous]] and with NoSenseOfHumour terror that is [[OurLichesAreDifferent 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.
* MagnificentBastard:
** Possibly Marceline in "Marceline's Closet." [[spoiler:Up until she tried calling Finn's house to see if he was there, she had no idea the duo were in her closet. They started laughing at their taped message and she realized right away they were there, and started doing things like recording an awkwardly emotional song, using the bathroom, and taking a shower. The ending cements this to make Finn and Jake paranoid as retribution for breaking in her home in the first place.]] She is very much a {{Troll}}.
** "In Your Footsteps": [[DoubleSubversion Doubly subverted]] with the bear. [[spoiler: At first it seemed that the bear was getting close to Finn so that he could steal his identity. Then it's revealed that no one actually thought the bear was Finn, and the bear just wanted to be more heroic by emulating Finn. Finn gives the bear the Enchiridion so that the bear can get along on the way to becoming a hero. HOWEVER... it turns out that the bear is a henchman for the Lich, and he was after the Enchiridion all along... so that he could give it ''to'' the Lich.]]
** The Lich in, well, "The Lich": [[spoiler: Having spent the last two years watching Finn and learning how he thinks, he manipulates Finn by possessing Billy and getting Finn, who idolizes Billy, to steal the jewels from the Crowns of Ooo. After Finn puts the jewels into the Enchiridion and the Lich's presence is revealed, he knows that there is one of two options: Finn will either submit and give him the book, or try to destroy it, forming the very portal the Lich wants. Either way, ''the Lich wins''.]]
* MemeticBadass: Billy!
** Also, he fought a bear!
* MemeticMolester:
** 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 [[UncannyValley 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.
* MemeticMutation:
** The original short itself, of course, but most of all:
--->'''Finn:''' MY HAT! IS AAAWESOOOME!!!
** Also from the short, and in earlier seasons: "Algebraic!" "Rhombus!"
** The title, and the show's frequent utilization of the TitleDrop trope, have made it memetic to say "ADVENTURE TIME!" to any unsuspecting person who innocently asks for the time.
** Don't forget, MARCELINE LOVES YOU GAIZ! (Bred on a fan-forum and appears to have spread.)
** "I'm a RADICAL boy on a mission for the Crystal Eye!!!"
** "'''UNACCEPTABLE!!!'''"
** "[X] years dungeon!!"
** Pictures of Lemongrab are often captioned by the memetic ''WesternAnimation/SpongeBobSquarePants'' acronym "'''E'''very '''V'''illain '''I'''s '''L'''emons."
** UNACCEPTABLE, Lemongrab's punk rock band from the Adventure Time comics and licensed games, has spawned a [[https://www.facebook.com/pages/UNACCEPTABLE/116597181866199?ref=tn_tnmn Facebook fan page]].
** "'''SO. VERY. LAAARGE!!!'''"
** "Shut yo' face! I came back for the ''[[ThePowerOfRock music]]''!"
** "'''My new prison is shaaaaame!'''"
** A buff, heavily bearded Finn [[{{Cosplay}} cosplayer]] dubbed "[[http://yfrog.com/h66fdaqj Beard Finn]]." [[http://twitter.com/#!/buenothebear/status/97500640456097793 Called "amazing" by Pen Ward.]] An AscendedMeme as of season 5.
** Cartoon Network seems to be trying to turn Manfred the Pinata's "[[BigWhat WHAAAAAT?!]]" into this.
** Various users on Adam Muto's formspring kept asking "Who would win, The Lich or Marceline's Dad?". He got tired of the questioning and responded with something involving "The Lich's dad". This was likely caused by someone on the wiki posting that Marceline's Dad may be able to defeat The Lich.
** "Werewolf Queen, It's always Werewolf Queen!"
** "[[CollectibleCardGame I floop the pig!]]"
** "Hey everybody look! Look at this book I found about eating babies, they just sit there while you eat them". "I don't know, but I'm going to go eat one right now". [[note]] based on the rather casual response of the fox in Jake the Dad after finding a book about a fox who eats babies. [[/note]]
** "Dad, the manual is a bunch of junk".
* {{Moe}}: Flame Princess when [[{{Tsundere}} she's being dere-dere]]. Most especially [[http://images.wikia.com/adventuretimewithfinnandjake/images/a/a2/Flameprincess2.gif when she's happy.]]
** Gunter and all those penguins are supremely adorable at all times. [[spoiler: [[OhCrap Too bad]] [[EldritchAbomination the cuteness]] [[PhysicalGod doesn't last.]]]]
** Prismo, all because of his {{Adorkable}} personality and his relaxing, laid-back South Asian accent, plus his [[https://33.media.tumblr.com/57de5cb416819f3c30e7a776954f8576/tumblr_inline_o5mw96Ts6n1tvcu1q_500.gif/]] adorable reaction to Jake saying he loves him.
** Finn, [[KidHero and]] [[TheCutie for]] [[{{Adorkable}} good]] [[CuteBruiser reason]].
** BMO is certainly moe, and Flambo even more so. Helped by their cute accents.
* MoralEventHorizon:
** Me-Mow crosses it when she poisons Jake and won't give him the antidote unless he kills Wildberry Princess and then, while talking in her sleep, she lets it slip that once Jake kills Wildberry Princess, she plans on double-crossing him and letting him die of the poison anyway.
** Ricardio crosses it when he tries to cut out Princess Bubblegum's heart with broken bottles of glass after spending most of the episode earning her trust. And if he didn't cross it there, he certainly did so [[spoiler:when he tied Lady Rainicorn in a knot]]. At least he had a goal to accomplish with cutting out Bubblegum's heart; [[spoiler:hurting Rainicorn]] [[ForTheEvulz was just to show off his new body.]]
** Even for being a JerkassWoobie character as Lemongrab with very mental problems, some fans think that he definitely crossed it in "Too Old".[[spoiler: Even though Lemongrab still left his clone alive and kept him alive on a machine, Lemongrab constantly abuses him physically and verbally. Not only that, he attaches shock collars to all of their 'sons' and forces them to entertain him after he became a FatBastard]]. [[spoiler: Then it gets even worse that when Lemongrab 2 thinks his twin has finally came to his senses when he heard Lemonhope's song, Lemongrab mercilessly eats his twin (again) and orders their boys to kill Princess Bubblegum, Finn (who is too distracted by the relationship blues to care), and Lemonhope.]]
** If the Lich hadn't crossed it before, he definitely crossed it when [[spoiler: he murdered Billy and possessed his body to manipulate Finn and Jake. Shortly after that he then tries to wish for the extinction of all life in the universe which just as monstrous, if not more.]]
** In "Earth And Water" we learn that [[spoiler: Flame King crossed it shortly after Flame Princess was born when he had her thrown in the forest to die just because he was somewhat worried she would usurp his thrown when she got older.]]
* MorePopularSpinoff: ''Adventure Time'' began as a lesser known, if memetic, short from ''Random Cartoons'', as mentioned on the main page.
* MostAnnoyingSound:
** Finn's battle screeches, especially in the early seasons, can be especially grating on the ears.
** Any line said by Lemongrab. His voice is either ridiculously hilarious, or like nails on a chalkboard, cringe-worthy, and a migraine waiting to happen.
* SugarWiki/MostWonderfulSound:
** Anything BMO says can cause large amounts of {{Squee}}:
-->'''BMO:''' ''Who wants to play video games?''
** The humming noises that the Lemongrabs made when they nuzzled their faces together in "You Made Me."
** Plop-Top's little "song." So cute!
** "James Baxter the Horse" has James' catchphrase as an in-universe example, being instantly able to cheer up anyone who hears it. The episode revolves around Finn and Jake trying to create their own version so that they can do the same thing.
** "DINNER TIME!"
* MyRealDaddy: ''Creator/RebeccaSugar'' has this reputation among the fandom. During her time on the show she provided many episodes that were the first to delve into serious CharacterDevelopment, 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 [[StartMyOwn created Steven Universe]], the show's just not quite been the same without her.
[[/folder]]

[[folder: N-Z]]
* {{Narm}}:
** Lemongrab. Even when his situation and backstory are genuinely PlayedForDrama, NightmareFuel, or a TearJerker, he's still a screaming, LargeHam 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 [[spoiler:present-day]] Ice King to an extent in "I Remember You," but it's mitigated by [[spoiler: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.
* NauseaFuel:
** Ice King's giant pile of boogers in "Holly Jolly Secrets". Just... '''''[[{{Squick}} 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 [[http://en.wikipedia.org/wiki/Surinam_toad 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 [[RodentsOfUnusualSize 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 [[TorturedMonster 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" made just about every viewer throw up. 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 [[spoiler: Lemongrab 2's state]]...
** The intense drooling of bird Finn in "The Food Chain" and his death from malnourishment.
* NeverLiveItDown: Even though Princess Bubblegum has committed up to 10 questionable acts at highest out of her hundreds of non-extremist benevolent actions, most PB haters remember her for this specific acts of atrocities instead of the kind and scientific princess that viewers know and love.
** Many of them are also shown to be justifiable later on (such as her disdain for the King of Ooo).
* NoProblemWithLicensedGames: Adventure Time: Hey Ice King! Why'd You Steal our Garbage?! is a fun ''[[VideoGame/ZeldaIITheAdventureOfLink Zelda II]]'' clone/MetroidVania, with an [[SugarWiki/AwesomeMusic superb soundtrack]] composed by ''Creator/JakeKaufman'', even featuring [[TheCameo a guest vocal song]] by ''Creator/CristinaVee''. It's only criticism being [[ItsShortSoItSucks its short length]] as the game can be finished in about four to five hours, not counting the NewGamePlus.
* NoYay: In the middle of "I Remember You" [[spoiler:Ice King trying to kiss Marceline when she accepts his hug, which she's squicked out by.]] After seeing "[[spoiler:Simon & Marcy]]," it's clear [[spoiler: from her point of view, she might see this as WifeHusbandry]].
* OneSceneWonder: Many due to the LoadsAndLoadsOfCharacters, such as Breakfast Princess in "Hitman" and Huntress Wizard in "Reign of Gunters".
*
* PainfulRhyme: 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.
* PanderingToTheBase: Fionna and Cake started off as a one-shot non-sequitur episode used to further establish the Ice King as a crazy loser, and [[TakeThatAudience 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.
** Although it can be argued that they show a lot about the way the author of each episode perceives the world around them.
* ParanoiaFuel:
** '''"I'M GOING TO TAKE IT FROM YOU WHILE YOU SLEEP."'''
** [[https://www.youtube.com/watch?v=8j-97_SgcCQ This promo]] for "The Lich," which features the Lich's horrifying face [[JumpScare 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 UpToEleven.
** [[spoiler: The Ice King's backstory.]]
* PeripheryDemographic: 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 StayInTheKitchen comment (and selling Hambo), the show's got a huge feminist following. Impressive considering [[http://99u.com/articles/30561/fred-seibert-never-compete-in-the-scrum 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 [[LesYay Bubbline]].
* PerverseSexualLust: A lot of this is diverted towards [[FetishFuelStationAttendant Marceline]]. Arguably, even ''more'' of this is directed towards her GenderFlip counterpart [[{{Bishonen}} Marshall]] [[TallDarkAndHandsome Lee]].
* TheProblemWithLicensedGames: 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 FanonDiscontinuity 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").
* RescuedFromTheScrappyHeap:
** Flame Princess, after her FreudianExcuse was revealed, and she finally found suitable companionship and became a noticably nicer, sweeter person.
** Lemongrab 2, Lemongrab's nicer, more empathetic twin. [[spoiler: Especially since he is possibly killed off by his own brother after saving their kids from his brother's tyranny.]]
** The events of "The Mountain" have done this for [[spoiler: Lemongrab himself. After being combined with Lemongrab 2 into Lemongrab 3, he has mellowed out, his kingdom is in good order, and he has become at peace with who he is.]]
*** Although he's still very much a BaseBreaker even after this episode.
* RewatchBonus:
** In "From Bad to Worse" when the group starts making their formulas, they observe the rat [[spoiler:(Science)]] "dancing." [[spoiler:She was actually pointing to her nametag.]]
** All of the "clues" in "Mystery Train."
** Many things from "Lady & Peebles," but especially the [[spoiler:five small dots on PB's monitor before she fixed it. These dots represented the hearts of Lady's babies.]] Things become HarsherInHindsight when you realize [[spoiler:that Lady got seriously injured throughout the episode. Worst of all, Ricardio ''twisted'' her!
*** Any episode with Lady and the kids that involves Korean being spoken (for those that don't speak Korean) as Lady especially is definitely getting CrapPastTheRadar.
** "A Glitch Is a Glitch" has a few. For example, at the beginning of the episode, Finn and Jake are using a computer paint tool to draw a drawing of Ice King covered in snakes and spiders. [[spoiler:Guess what attacks Ice King at the end of the episode?]] Huh? Erm, no, [[MixAndMatchCritters but you were close.]] There's also the fact that the Glitch eats the code for Princess Bubblegum's chair, which disappears in the very next scene. Also, Jake's arm claiming that PB's hand is cheating on him makes sense once you realize that PB ''made out'' with her hand ([[MindScrew though you might not want to dwell on this too long]]).
** [[spoiler: Ice King and Marceline's]] pasts and their connection to each other ''seems'' like a ShockingSwerve the first time through, until you rewatch old episodes and start noticing the loads of hints and foreshadowing dropped.
** TheReveal in "Earth And Water" certainly puts a lot of scenes involving [[spoiler: Flame King]] in a whole new light.
** Seeing all of the grape soda cans pop up throughout the series after the episode "Dark Purple".
** A couple of subtle background pieces are this at the end of the mini-series "Stakes".
*** After Peppermint Butler dropped the bucket releasing the essence of the Vampire King and exploding Peeble's Uncle Gumbald's cabin, in the next episode a [[http://imgur.com/HRn1SGm "#1 Butler"]] mug can be seen in the wreckage as Finn tries to collect all of Pep But's pieces.
*** The [[http://imgur.com/enoWDgb life preserver]] that says "Life" and "Safe" on it. First, it has a bird's nest with eggs on it furthering the message of the song "Everything Stays" that life goes on and the cycle continues. Second, it is next to the de-vampired Vampire King showing that both his life is safe now that he is free from his vampirism and that life is safe once again now that the essence of the king is gone (and in Marceline).
* RonTheDeathEater: Princess Bubblegum has received a lot of flack from fans over some questionable acts. She ''does'' occasionally lapse into some morally ambiguous areas, but certain parts of the fandom unfairly make PB put to be a monster who apparently eats her own subjects ForTheEvulz.
** [[{{Tsundere}} Flame]] [[FieryRedhead Princess]] sometimes gets this, [[DieForOurShip 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 FreudianExcuse 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 [[spoiler: 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 ForTheEvulz.
* SeasonalRot:
** Season Five is considered a weaker season than previous ones, which mostly has to do with some extremely controversial characterization regarding Finn, Princess Bubblegum and Lemongrab.
** Season Six is considered this by some fans due to the stories not having much focus on its plotlines and the anti-climatic outcome of the whole meteor plot and the resolution with Finn's father.
* SelfFanservice:
** Most fanartists who draw Finn in a realistic or {{Animesque}} style ignore the WordOfGod that his [[TheNoseless lack of a nose]] is a [[FacialHorror genetic mutation]], he has bad teeth and his [[NiceHat hat]] is made from a [[BearsAreBadNews bear's head]]; instead drawing him as a {{Bishonen}} with normal features, perfect teeth and a fluffy fabric hat (or none at all).
* TheScrappy:
** While he's more of a base breaker, even fans Lemongrab's despised him in during the events of "[[Recap/AdventureTimeS5E3FiveMoreShortGraybles Five More Short Graybles]]" and especially "[[Recap/AdventureTimeS5E3FiveMoreShortGraybles Too Old]]", where he first ate his clone alive [[AbusiveParent and then started to abuse both his clone and their children.]] However, his characterization in Lemonhope and The Mountain has started to ease him out of Scrappy territory and back into his position as a base breaker.
** Ash, Marceline's boyfriend, also gets a lot of hate due to his selfish attitude and his [[DomesticAbuse abusive and manipulative behaviour towards his girlfriend]]. Naturally, this is the most pronounced among fans of Marceline.
** Lumpy Space Princess also gets a lot of hate due to some of her terrible actions, and refusal to go through CharacterDevelopment. For example she blames everyone else (especially her parents and Bubblegum) for her problems, stalks and attacks boys (the pizza boy and [[spoiler: many in the fandom believe she raped Finn. Whether it was rape or just making-out, it's clear her advances were unwanted and haunted Finn]]), terrorizes villagers ("The Monster"), abandoning Sweet P. and destroying Tree Trunks's house ("Be Sweet"), committing an act of terror against the Candy Kingdom ("Bad Timing"), and for all intents and purposes- killing her boyfriend (also "Bad Timing"). And that isn't even all of it. A bit of a BaseBreaker because some fans find this funny.
* {{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."
* ShipMates: 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, [[OneTrueThreesome a threesome between the trio]]. When Flame Princess came along, a few others evolved to 'Flumbaline'. The fanbase adapts, alright.
* ShipToShipCombat:
** [=FinnxPrincessBubblegum=] vs. [=FinnxMarceline=]. This goes double for their gender-swapped counterparts.
** [[TakeAThirdOption A third party]] has risen in the ever-expanding [[HoYay Marceline/Bubblegum ship.]]
** There may be a fourth candidate in the rising [=Finn/FlamePrincess=] ship. And now that Nat has designed ''Flame Princess's'' gender-swapped counterpart, [[http://natazilla.tumblr.com/post/17742682309 Flame Prince]]... welp, The Great Mushroom War might as well be occurring in this fandom.
* SlowPacedBeginning: 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 WorldBuilding 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 DistaffCounterpart, with himself. This is made even more troubling when it's revealed that [[spoiler: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 [[spoiler: brother]]s.
** Bubblegum passionately making-out with her own hand in "A Glitch is a Glitch" to keep from having to date the Ice King.
* SugarWiki/SweetDreamsFuel:
** [[http://www.youtube.com/watch?v=7G1T8fh_xXU The show's ending theme.]]
** [[http://nastysonix.com/post/5237604633/adventuretime-storyboard-revisionist-david-c BMO's song in "Videomakers"]].
** Prince Gumball's [[spoiler:(Ice Queen's)]] [[http://www.youtube.com/watch?v=7xsSEbWNnIA song in "Fionna and Cake"]], and really any song that was written by Rebecca Sugar on the show (except the Fry Song and "I'm Just Your Problem," of course, which can be real downers).
** And that's still nothing to speak of the background music. [[http://www.youtube.com/watch?v=El5IFLZ0SD0 Check this out, for example.]]
* TaintedByThePreview: "The Suitor" was a base breaker from the previews cause many people were worried about some sort of RelationshipSue development [[spoiler: this was not the case as A) PB had no interest whatsoever and B) the episode was a complete deconstruction of DoggedNiceGuy.]]
* TakeThatScrappy: To Lemongrab, multiple times.
** 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 [[WouldHurtAChild 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. [[BadassGrandma You go, Tree Trunks.]]
** Ash getting punched out by [[spoiler: Simon]] in "Betty". He didn't even know who he was. He just wanted to take his flying carpet.
* TheyWastedAPerfectlyGoodCharacter: Probably the most common criticism as a result of its episodic structure and ever-growing cast of reoccurring and one-off characters.
** So Betty Grof comes to the future with the help of [[spoiler: Simon's time portal]]. You'd think that as the second current human in Ooo that Finn will try to get to know who she was, why was she engaged with the [[spoiler: Ice King]], what was earth like before the Mushroom War, or even share their knowledge of being human. Nope, partly due to its short episodic format, we didn't get to know her that much aside from being the determined fiancee of Simon Petrikov.
** ''Orgalorg!'' [[spoiler: His origin episode was very intense and set him up as something to be feared. When he finally shows himself in the finale, he is dealt with swiftly (see AntiClimaxBoss above). He could've made an interesting new BigBad since the Lich is currently Sweet P. Its very likely that he will make a return, but probably not in the near future.]]
** [[spoiler:13-year old Princess Bubblegum]] in "Too Young". She has only a little over an episode before [[spoiler:being changed back to normal (the original intention was for her to remain young for a few more episodes, but this was nixed when the team found it hard to write for her)]], and that aspect of her is never brought up or mentioned ever again.
** Marceline sometimes goes half a season without appearing at all, and even in her ADayInTheLimelight episodes she ''still'' gets shafted for screentime. The worst example is definitely "They Went to the Nightosphere"/"Daddy's Little Monster", a two-part episode set in Marceline's original home and appears to focus on the issues between Marceline and her father... only for the vast majority of the episode being Finn and Jake's wacky adventures with demons and her father getting more screentime than her, with Marceline spending most of the time possessed by her father's amulet.
** [[spoiler:Lady and Jake's children]]. Five characters with varying combinations of their parents magical abilities, but only three of them have gotten any lines (in English, at least), and only one of those received any actual development. Despite their significance, they've all been relegated to background or one-episode characters.
** Flame Princess has a lot of potential as a character, especially as her continual wavering between good and evil meant she could work equally well as a hero ''or'' a villain, but was mostly relegated to just "Finn's girlfriend" and most of her development revolved around him. "Frost & Fire" gave her more agency and "Earth & Water" had her usurp her father as Flame King, hopefully signifying her rise to prominence. But she has been DemotedToExtra ever since that event, with only ''two'' episodes after this incident[[note]]"The Red Throne" and "The Cooler"[[/note]] that features her as a major character. Finn doesn't even keep his promise to her about visiting as after becoming the new ruler of the Fire Kingdom, FP is essentially PutOnABus with Finn never visiting or even speaking to her after his irresponsible actions in "The Red Throne".
** Martin, [[spoiler: Finn's father]], an effective HateSink and foil to Finn with a mysterious backstory. Eventually he was PutOnABus at the end of the sixth season (in which he only appears in six episodes) with little revealed about him.
* UglyCute:
** 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 CreepyChild 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".
* UncannyValley:
** Lemongrab's expressionless eyes. If they were more cartoonish and less resemblant of actual human eyes, 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.
** [[http://static.tumblr.com/nxveby3/K7nluq5f7/tumblr_luonoxu9hq1qeyb9ho1_500.gif 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 [[https://s3.amazonaws.com/data.tumblr.com/tumblr_m8ddenBhQZ1rzn2oko1_500.gif human-looking face]] that ends up looking {{Gonk}}ish. Note that BMO has Lemongrab eyes. Those damn eyes are creepy.
** Despite bringing joy and happiness wherever he goes InUniverse, 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.
* UnpopularPopularCharacter: Ice King and Magic Man. Also Lemongrab to [[BaseBreaker one side of the base.]]
* ViewerGenderConfusion: BMO. WordOfGod states BMO, being a robot, has NoBiologicalSex, and is called a "he" more out of convenience.
** BMO has referred to her/his self using both pronouns, and seems to have decided his/her alternate personality/imaginary friend Football is a girl.
* SugarWiki/VisualEffectsOfAwesome:
** 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 StopMotion animation in "Bad Jubies". There is even a [[https://youtu.be/0OndNqmi-Pg "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.
* WhatAnIdiot:
** 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 [[spoiler: The Cosmic Owl]]: "You blew it."
* WhatDoYouMeanItsForKids: 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.
* WhatDoYouMeanItWasntMadeOnDrugs: 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.
* WinBackTheCrowd: After [=CNReal=] bombed and ''Adventure Time'' turned out to be a break away success, Cartoon Network gained a renewed interest in animated series.
* WriterInducedFanon:
** 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 [[UnresolvedSexualTension sour]]. Olivia Olsen confirmed that it's the latter.
** 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. [[spoiler: Then confirmed to be brothers really sank that ship... and then Lemongrab eats Lemongrab 2.]]
* TheWoobie:
** 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 [[TheMentallyDisturbed 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 [[OhCrap giggled]], thus starting Baby-Snaps's StartOfDarkness and SanitySlippage. 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 [[DrivenToSuicide 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 [[HeroicSacrifice 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 [[spoiler: 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 [[spoiler: 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 [[spoiler: 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 [[spoiler: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.
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