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- All There in the Manual: The TV Show rarely focuses on them and most of the time it's generally A Day in the Spotlight (At the current there are only four episodes: The first focusing on Fiona and Cake, the second Marshall Lee, the third on Lumpy Space Prince and the fourth spreading attention across some of the supporting cast). Leaving it to the comics to generally explain more about the characters (which are canon as Natasha Allegri was the one who came up with a good chunk of concepts for the characters and wrote the comics herself).
- Alternate Universe: A rather strange case of this as they're creations of a fanfiction the Ice King made. Yet the show treats them like this anyway.
- Distaff Counterpart: Played pretty straight here with a good majority of the characters being a flip of their genders. Though backstories and motivations are different from their prime counterparts.
Voiced by: Madeleine MartinFinn's Gender Flip counterpart who is considerably more level-headed than he is. She still manages to have a thirst for adventure, however. Appears in "Adventure Time with Fionna and Cake" and "Bad Little Boy".
- Action Dress Rip: When she has to fight Ice Queen while wearing a ball gown. Cake hilariously mistakes this for something else.
- Action Girl: She's shown to be a good fighter like her male counterpart, especially when battling Ice Queen.
- Adorkable: Awkward around guys.
- Badass Adorable: She's cute as a button, but she knows how to put up a fight.
- Badass Normal: She has no powers of her own and yet she regularly beats up stronger, more powerful people with nothing but her fists and sword.
- Compressed Hair: Somehow manages to fit all that hair into her hat.
- Cute Bruiser: She makes good use of Good Old Fisticuffs whenever she's not using her sword.
- Distaff Counterpart: To Finn.
- Expy: According to Word of God, she is partially based on Sailor Moon. Highlighted by the dress she wears to the ball, which is very similar to one of Serenity's. Also her bunny hat. (Sailor Moon's real name, Usagi, means rabbit.) It gets another Shout-Out in this alternate cover◊ from the third issue of her comic series.
- Flat Character: Her supporting cast is a lot more fleshed out than she is. The only thing that really stands out about her is that she's a female Finn.
- Gendered Outfit: Fionna's skirt and bunny ears are a feminized version of Finn's pants and hat.
- Genki Girl: Like Finn, she's hyperactive and energetic, when she's not beating her enemies to a pulp.
- Hair of Gold, Heart of Gold: She's heroic and innocent like her male counterpart.
- Idiot Hero: Not as bad as Finn, though she's more impulsive than stupid.
- Interspecies Romance: She's a human who has Ship Tease with Gumball and Marshall Lee, who are a candy person and a vampire respectively..
- Little Miss Badass: She's the youngest of the cast, but she still kicks copious amount of ass.
- Magic Skirt: Her skirt reveals nothing despite all the action she gets into. Justified as it's really a skort.
- Morality Pet: To Marshall Lee. Fionna's crying is enough for him to stop messing with the poor girl's head after faking his death just to make her confess that she has feelings for him. This doesn't stop her from beating him up after he reveals his real plan, though.
- Nice Hat: Her bunny hat.
- One of the Boys: Seems to consider herself this; in the comics Marshall Lee mentions having a "boy's night" and she asks why they had boy's night without her.
- Pint-Sized Powerhouse: Fionna is strong enough to lift and hold Prince Gumball, similar to how Finn could lift up Princess Bubblegum.
- Rapunzel Hair: When her hair's down, it reaches all the way to her feet.
- Tomboy: Ice Queen used it as an insult, but with her Zettai Ryouiki and love for a pink crystal sword she's closer to Tomboy with a Girly Streak.
- Tomboy and Girly Girl: The Tomboy to Cake's Girly Girl.
- Women Are Wiser: She's much less of an Idiot Hero than Finn.
- Zettai Ryouiki: Her design indicates Type B.
Jake's Gender Flip counterpart (who is a cat) and Fionna's adoptive sister. Has the same stretching powers Jake does. Appears in "Adventure Time with Fionna and Cake" and "Bad Little Boy".
Voiced by: Roz Ryan
- Big Beautiful Woman: When she shapeshifts into a more humanoid form and dances on stage in "Bad Little Boy".
- Big Brother Mentor: She's usually the one giving Fionna advice like how to get Gumball's attention.
- The Confidant: Fionna makes a bee line to her when she wants to talk about relationship issues.
- Cool Big Sis: Cake is a big sister figure to Fionna, much like Jake is like a big brother to Finn. She's also very protective of Fionna, highlighted when she thinks Prince Gumball tried to mess with Fionna.
- Defiant Captive: Marshall Lee kidnapped her in "Bad Little Boy", but she still fought back.
- Deuteragonist: It's "Adventure Time with Fionna and Cake" after all.
- Distaff Counterpart: To Jake.
- Female Feline, Male Mutt: She's a cat despite being a female counterpart of Jake, who's a dog.
- Interspecies Romance: Has a crush on Lord Monochromicorn.
- Loyal Animal Companion: To Fionna.
- Rubber Man: Like Jake, she has stretching powers that could possibly rival Mr. Fantastic.
- Sassy Black Woman: Hilariously. Even if she is a cat, and a mostly white one, at that.
- Shaking the Rump: Does this in "Bad Little Boy" after shape-shifting herself into a curvy figure during Marshal Lee's song.
- Shapeshifter Weapon: She's seen being used as a weapon by Fionna during the first fight with Ice Queen.
- Sizeshifter: Like Jake, Cake is capable of making herself bigger or smaller depending on the situation.
- Shipper on Deck: Even more so for Fionna/Gumball than Jake is for Finn/Bubblegum.
- Spider-Sense: When she is agitated or senses danger, her tail frizzes out.
- Tomboy and Girly Girl: The Girly Girl to Fionna's Tomboy.
- Trademark Favorite Food: Catnip, because she's a cat.
Princess Bubblegum's Gender Flip counterpart. Appears in "Adventure Time with Fionna and Cake" and "Bad Little Boy".
- Voiced by: Neil Patrick Harris
- Amazon Chaser: Attracted to Fionna both for her strength and beauty. However this was actually Ice Queen in disguise and simply flattering Fionna into a trap, but the real deal also thinks she is 'incredible' when fighting.
- Betty and Veronica: Unlike in the main timeline, where this isn't really a thing, the Fionna and Cake universe seems to be centered entirely around shipping, with both men more clearly attracted to Fionna. Prince Gumball is the clean-cut, chivalrous Nice Guy Betty to Marshall Lee's edgy, flirty bad boy Veronica.
- Big Ol' Eyebrows: In comparison to other males, like Marshall Lee.
- Camp Straight: Given that he outwardly voices attraction to Fionna at the end of "Adventure Time with Fionna and Cake," he seems to be this. Or at least Camp Bi; we don't know his life, but if it's anything like his female counterpart's, he may have had something with Marshall Lee.
- Distressed Dude: From what we've seen, he's usually kidnapped by the Ice Queen and rescued by Fionna.
- Giant Poofy Sleeves: It's his go-to look and they're even poofier than Bubblegum's!
- Human Popsicle: Ice Queen froze him in a giant ice spike and hung him from the ceiling of his bedroom.
- Interspecies Romance: With Fionna.
- Large Ham: "SO VERY LARGE."
- Masculine Girl, Feminine Boy: Fionna is just as badass as her male counterpart while Prince Gumball is an absolute non-combatant. Interestingly, he also seems to be this to Princess Bubblegum, preferring baking over science and seemingly completely devoid of PB's hidden badass side.
- Master of the Mixed Message: We can never really tell whether he likes Fionna in the romantic sense or not. It's somewhat confirmed in "Fionna and Cake", but it goes back to being ambiguous in "Bad Little Boy".
- Nice Guy: So far it doesn't look like he has a hidden side like his counterpart. Although such a hidden side is hinted at when he allows Fionna and Cake to toss the little Jelly Kinders around and kick them onto the ceiling, claiming that they're not alive (they are).
- Necromancer: Like his real female counterpart, he can sort of raise the dead.
- Noble Male, Roguish Male: The noble male to Marshal Lee's roguish male for Fionna's affections.
- Non-Action Guy: From what we've seen.
- Pretty Boy: To be expected, what with him being a prince, based on the lovely Princess Bubblegum and voiced by Neil Patrick Harris.
- Punny Name: His full name is Bubba Gumball. According to Word of God, his first name was supposed to be "Blowpop," but that didn't push through due to copyright reasons.
- Purple Eyes: When his eyes enlarge.
- Real Men Cook: Artwork by Natasha Allegri shows that he enjoys baking. Confirmed in "Bad Little Boy."
- Real Men Wear Pink: Or in this case, are pink. And enjoy baking.
- Sitcom Archnemesis: To Marshall Lee.
- Spear Counterpart: To Princess Bubblegum.
- Supreme Chef: Unlike his female counterpart, he trades science skills for being a master baker.
Spear Counterpart to Marceline, the Vampire Queen. First appears in "Adventure Time with Fionna and Cake" in a nonspeaking cameo. Later has an episode dedicated to him called "Bad Little Boy".
Voiced by: Donald Glover ("Bad Little Boy")
- Affably Evil: He plays the "Bad Boy" persona well, makes no secret of his heritage, and will summon the forces of the undead on you if he has to, but is overall a Jerk with a Heart of Gold.
- All Girls Want Bad Boys: He believes that Fionna likes him because of this.
- Author Avatar: Just like Ice Queen with Marceline herself narrating the fanfic in "Bad Little Boy". Almost an Evil Counterpart since he's nastier than Marceline is currently, pre-Character Development.
- Bat Out of Hell: He can turn into a bat like his counterpart Marceline as seen in "Bad Little Boy".
- Betty and Veronica: Unlike in the main timeline, where this isn't really a thing, the Fionna and Cake universe seems to be centered entirely around shipping, with both men more clearly attracted to Fionna. Marshal Lee is the edgy, flirty bad boy Veronica to the clean-cut, chivalrous Prince Gumball's Betty.
- The Cameo: In the first Fionna and Cake episode.
- Card-Carrying Villain: As he says in his rap "I'm evil without even trying."
- Cute Little Fangs: Though it's fairly clear that his entire mouth is full of sharp teeth.
- Cute Monster Guy: Similar to Marceline.
- A Day in the Limelight: The Fionna and Cake episode "Bad Little Boy" focuses mainly on him.
- Eerie Pale-Skinned Brunette: Because he's a vampire and he can't stand the sun.
- Full-Name Basis: He's always referred to by his full name.
- Evil Counterpart: Possibly to Marceline, given that he's more antagonistic than she is.
- Evil Sounds Deep: He speaks in a deep, baritone voice.
- Half-Human Hybrid: It's revealed that he's the son of a demon and the Vampire King in "Bad Little Boy".
- Jerk with a Heart of Gold: Pushes Cake out of the way and even kidnaps her, just as an elaborate ploy to fake death and get Fionna to admit her feelings for him. And yet, all it took was Fionna crying and calling him out on it to get him to realize how bad he was being. He also has this personality in the comics, and in "Five Short Tables" he's shown to be genuinely concerned about Lumpy Space Prince and tried to cure him of his uncontrollable coughing.
- Noble Male, Roguish Male: The roguish male to Prince Gumball's noble male for Fionna's affections.
- Older Than They Look: Like Marceline, he's a thousand years old, but he barely looks any older than Gumball.
- Pretty Boy: Oh boy, is he ever! His first appearance in "Bad Little Boy" is him hovering over Fionna and Cake's house with his hair all tousled by the rain and him flashing his best bedroom eyes at Fionna.
- Pet the Dog: Marshall openly boasts about how evil and villainous he is, but will stop acting mean in a second to stop Fionna from crying.
- Punny Name: His full name sounds just like Marceline.
- Sitcom Archnemesis: To Gumball; they relate with insults and pastry stealing.
- Spear Counterpart: To Marceline.
- Tall, Dark, and Handsome: According to the fangirls and he does fit the description of being tall, dark haired, and good-looking.
- The Trickster: See Troll below.
- Troll: Pastry stealing, kidnapping, and faking his death all for his own amusement.
- Vampire Monarch: He is the Vampire King, after all.
- Vegetarian Vampire: Like Marceline, he's mostly seen draining the red from red or pink objects like Gumball's cream puffs.
- Villain Song: Though he gets two songs in the episode, his second song (the rap complete with beatboxing skeleton Mooks) definitely qualifies.
- Would Hit a Girl: First kicks Fionna through the other side of the stage in a playful fight, later pushes Cake into a tree, then engages in some shapeshifter brawling with Cake.
Lumpy Space Prince
Lumpy Space Prince
See Lumpy Space Princess' entry Adventure Time MainThe handsome, charmingly suave, and generous prince of Lumpy Space.
Voiced by: Pendleton Ward, Peter Serafinowicz ("The Prince Who Wanted Everything")
- Alternate Character Interpretation: Invoked. In Marceline's rendition of the Ice King's fanfic, LSPrince is (unsurprisingly) the exact same character as LSPrincess, only with a peach-fuzz mustache. Odd thing is: this is LSP's first appearance. It wouldn't be until his 2nd appearance that gave him character development and turned him into what is essentially the exact opposite of LSP's personality.
- The actual episode reveals that Ice King also views him as virtually identical to LSP and the suave, sophisticated portrayal he gets in the episode is only because LSP forced him to alter the character.
- Bishōnen: A hilarious parody. His face frequently shifts from LSP with some peach fuzz to a classic Animesque bishonen, while retaining his lumpy purple body.
- Char Clone: He receives such an outfit from the forest animals in "The Prince Who Wanted Everything", although he ends up discarding it.
- Cool Helmet: And one that looks oddly familiar.
- Cool Mask: Again one that looks oddly familiar.
- Large Ham: If possible, he's an even bigger ham than his female counterpart!
- Vocal Dissonance: Somehow manages to have this for the exact opposite reasons as his female counterpart. His suave British accent fits his appearance even less than LSP's husky Valley Girl one.
Lady Rainicorn's Gender Flip counterpart and Prince Gumball's loyal companion. Speaks only in Morse Code. In a relationship with Cake.
- Affectionate Nickname: Prince Gumball sometimes calls him "Mo-Chro."
- "Awesome McCool" Name: His name sounds like it could be used for a supervillain.
- Bilingual Bonus: Only talks in Morse Code. He does this by stomping and pawing at the ground.
- Cool Horse: Both him and his female and rainbow counterpart.
- Dark Is Not Evil: He looks like the mount of a Black Knight, but he's a great guy.
- Everyone Knows Morse: This is his main form of communication.
- Nice Guy: He's never shown to be anything but kind and placid.
- Non-Human Sidekick: To Prince Gumball.
- Spear Counterpart: To Lady Rainicorn.
- Unicorn: Half, anyway.
Ice King's Gender Flip, who also manages to look thirty years younger than him. Instead of the trademark crown, she wears a tiara instead. Appears in "Adventure Time with Fionna and Cake."
- Voiced by: Grey DeLisle
- Abhorrent Admirer: To Gumball.
- Amulet of Concentrated Awesome: If she loses her tiara, she loses all her powers.
- Attractive Bent-Gender: Best example out of all the genderbent characters, as she appears taller and much younger than the actual Ice King and wears a beautiful blue gown. Justified, as she exists in a fanfiction of his creation. It's also because Natasha Allegri, who designed her, has said that she finds attractive villains far more unsettling than ugly ones.
- Author Avatar: To the Ice King.
- Dirty Old Woman: She goes after the much younger Prince Gumball, mirroring the way her male counterpart goes after young princesses.
Fionna: Ice Queen, why you always predatoring on dudes!?
- Although she appears to be much younger than the Ice King, so maybe she's only slightly older than Gumball.
- Lampshaded hilariously by Fionna:
- Distaff Counterpart: To Ice King.
- Dying as Yourself: In the comics, once she gets ahold of the soft fire the Flame Prince was holding. It negates the evil within the jewels on her tiara and brings her back to her senses before she melts away. Course as it's Gunther telling the story this time, it's unknown if this'll stick or not.
- Evil Is Deathly Cold: She has ice magic and uses it for destructive purposes when battling Fionna or trying to kidnap Prince Gumball.
- Evil Old Folks: Also like Ice King.
- God Save Us from the Queen!: Like Ice King but female.
- For the Evulz: Unlike Ice King, she doesn't seem to have any redeeming values and doesn't care who has to get hurt to get what she wants.
- Grandma, What Massive Hotness You Have!: She's definitely much more attractive than the Ice King.
- Her Codename Was Mary Sue: She's a more attractive, more competent version of the Ice King, the story's author.
- An Ice Person: She has the ability to control ice much like her male counterpart, but her powers are much more offensive.
- Lady of Black Magic: More serious than Ice King and has much more powerful magic. She also wears a feminine and elegant blue dress.
- Making a Splash: This is an extension of her true magic as a water nymph.
- Master of Disguise/Latex Perfection: Her disguise as Prince Gumball was pretty much spot-on, unlike the Ice King's Bubblegum disguise.
- More Deadly Than the Male: Much more competent than the Ice King. Justified, as it's a fanfiction of Ice King, so he probably made her competent regardless of her gender.
- Most Fanfic Writers Are Girls: Just like how Ice King wrote the fanfiction she lives in, in "Five Short Tables" it's revealed she writes her own fanfiction with Spear Counterparts of herself, Fionna and Cake in the form of Ice President, Flynn the Human Being, and Jacques the Raccoon.
- Never Mess with Granny: She may be old, but that doesn't make her any less formidable in combat.
- The Noseless: In contrast to Ice King's long, sword-like schnoz. Early concept art shows that she was going to have one, though.
- Reality Warper: At the climax, she somehow manages to turn Fionna's sword into a useless block of ice just by staring at it. This should probably be the first sign that she's actually a Mary Sue created by the Ice King.
- The Reveal: The comic based on the characters goes into her backstory. Unlike Ice King, she wasn't human but rather a kindly water nymph. She saved a cat from danger and it sought to repay her by entering a dangerous labyrinth to claim a jewel. She followed it and saved it from another hazard but was injured in the process. So the cat used the jewel to save her, but in the process it made her crazy. Eventually taking on the moniker as the Ice Queen and fashioning a tiara with the jewel embedded in it.
- Rapunzel Hair: Like the Ice King's beard, although hers is in significantly better condition.
- Shout-Out: According to Word of God, her dress is supposed to resemble the dresses of the stepsisters from Cinderella.
- Silver Fox: Presumably as old as the Ice King and sports the voice of an old witch, but is absolutely gorgeous.
- True Blue Femininity: Inverted: she's cruel, deceptive and everything but 'fair and gentle'.
- Unusual Eyebrows: The counterpart to Ice King's beard.
- Villain Sue: Turns out to be an in-universe example. The wake up call to this would probably be the fact that she somehow managed to turn Fionna's sword into a useless block of ice by just looking at it.
- With Great Power Comes Great Insanity: Since she's the gender swapped Ice King, it's safe to say her tiara also drove her insane.Fionna (after knocking the tiara off Cake*: No! You might catch her crazy.
- The comics implied that this was indeed the case. However it wasn't so much the tiara but the jewels within it that did it.
- Winter Royal Lady: She has the title of Ice Queen, is always seen wearing blue, and is most definitely dangerous. Turns out she was born like this since she was originally a water nymph.
Ice Kingwrites himself as a major Marty Stu in his latest Fionna and Cake story.
Gunterfifty feet tall and shoots Frickin' Laser Beams.
The genderbent counterparts to the Lemongrabs. They are quite similar to the originals, but are noticeably sexier... Well, slightly. The two debuted in the third issue of the Fionna and Cake comics, in the 2-page ministory "Sour Candy" by Kate Leth.
- Abusive Parents: While not outright abusive, Lady Lemongrab isn't the most... competent mother. She frequently yells harshly at her children when making simple requests or statements, and even tied up one of them in ribbon, even as the little thing wiggles in protest. Throughout their debut comic, the lemon children seem very unhappy, and their moms are oblivious to this.
- Alliterative Name: Rather than referring to themselves as countesses, they call themselves "Lady Lemongrabs."
- All Lesbians Want Kids: Being psycho lesbians certainly didn't stop the Lady Lemongrabs from wanting to have children - or succeeding in their reproductive efforts!
- Ambiguous Disorder: Similar to the Lemongrabs. Always yelling, overly-harsh when speaking to their children, unable to notice when their daughters are unhappy, overly-demanding.
- Ambiguously Gay: Averted. The author confirmed on her Tumblr that the characters are homosexuals.
- Attractive Bent-Gender: Kinda subtle. The Lady Lemongrabs don't look much different from the originals aside from the obligatory and silly tertiary sexual characteristics. But they do appear to each have two butt cheeks (visible because they wear very tight pants,) unlike the original one-cheeked Lemongrabs.
- Author Appeal: Possibly the reason that the Lady Lemongrabs wear eyeshadow, mascara, blush, and lipstick. The author of their first comic loves makeup, and frequently posts makeup tutorials on her Kate Or Die website and Tumblr.
- Bald of Awesome: Both Lady Lemongrabs.
- Big, Screwed-Up Family: Moreso than their male counterparts. Their kids don't seem as happy with their strange endeavors.
- But Not Too Gay: To promote "Sour Candy," Kate Leth made a drawing that she described as "homoerotic." She then followed this up by explitily stating that the comic itself was not that homoerotic. Also overlap with Hide Your Lesbians, because the lesbian aspects of these characters is significantly toned down in "Sour Candy."
- Color-Coded Characters: The color schemes of their outfits are black, grey, and white, and reversed for them. Lady Lemongrab 1 seems to be the one wearing the white shirt.
- Cute Mute: Their lemon children. The little ones seem to communicate through simple gestures, and facial expressions- in addition to speech bubbles containing vague symbols. This could be due to their very young age, though.
- Dysfunctional Family: They have one. Just look at how sad their kids look throughout "Sour Candy."
- Everything's Sparkly with Jewelry: They have jewels on the front of their blouses, and sometimes on their belts.
- The Fashionista: Unlike their male counterparts, who wear very simple jumpsuits, the Lady Lemongrabs wear puffy-sleeved blouses with yellow jewels on the front, long gloves, stylish belts, and taller boots, in addition to makeup. They also appear to have a variety of costumes.
- Feminine Women Can Cook: Hilariously averted- the cake that Lady Lemongrab makes is horrible.
- Fictional Holiday: "Happiest Lemon Day" is a holiday created by the Lady Lemongrabs to celebrate... something?
- Flipping the Table: Lady Lemongrab does this to a couch, while shrieking "NYAH!"
- Gag Nose: Kate Leth didn't shy away from giving the Lady Lemongrabs the same long, pointy noses for which the original Lemongrabs are so well-known.
- Giant Poofy Sleeves: Both Lady Lemongrabs have these.
- Has Two Mommies: The Lady Lemongrabs are parents to several odd-looking lemon children, like their male counterparts.
- Holding Hands: In this print by "Sour Candy" creator Kate Leth.
- Homosexual Reproduction: Like their male counterparts, the Lady Lemongrabs found a way to make themselves children. Unlike the males, we're not sure how they managed to do this.
- Hulk Speak: Sometimes does this when she gets very emotional.
- Hysterical Woman: Like the counterparts they are given to drama and shouting.
- Large Ham: Of course. Just watch Lady Lemongrab frantically/psychotically making a cake and decorating the castle.
- Lethal Chef:
- The cake that Lady Lemongrab makes contains mold, slime, dead bugs, possibly a rat, and a sharpened pencil.
- This aspect may have been included to make her a foil to Prince Gumball, a skilled baker, as Earl of Lemongrab is a foil to the genius scientist Princess Bubblegum by being an irresponsible scientist and a ditz.
- Lipstick Lesbian: Kate Leth wrote the two Lady Lemongrabs to be a couple. They are also extremely feminine and even wear lipstick. As seen in the hand-holding illustration above, however, they don't always wear lipstick.
- Mad Scientist's Beautiful Daughter: Partial aversion. Prince Gumball seems to fairly mild-mannered and sane- it's his daughters who are the crazy ones. They're still quite attractive, though.
- Male Gaze: (Not just for the male readers, though.) This is pretty much the only reason why Kate Leth gave the Lady Lemongrabs skin-tight pants that show off their butt cheeks, and making them turn around to give the reader a nice look.
- Modest Royalty: Downplayed. Like the Lemongrabs, they don't wear any visual indicators of their royal titles. However, they are noticeably fancier than the Lemongrabs, and more flamboyant in their dress.
- Nightmare Fetishist: They appear to have buckets of slime and dead animals, among other things, in their basement. Which Lady Lemongrab eventually bakes into a cake.
- No Indoor Voice: Of course, just like the original Lemongrabs. "LEMON CHILD! WHERE DO WE KEEP THE FUN SUPPLIES?!"
- Painted-On Pants: Both wear extremely tight pants that give the viewer a good look at their butt cheeks.
- Psycho Lesbian: Literally. It's been confirmed that lemon people, by nature, are prone to clinical insanity.
- Serious Business: For them, everything is serious business.
- Super Strength: Lady LG flipped a couch without much effort.
- Tertiary Sexual Characteristics: The Lady Lemongrabs are nearly identical to the original Lemongrabs. Aside from breasts, the only major differences are their outfits and makeup.
- Woman in White: Lady Lemongrab 1 wears a white blouse.
Dr. PrinceDr. Princess' Gender Flip counterpart. A villain in one of Ice King's stories.
- Voiced by: Tom Kenny
- Voiced by: Hannibal Buress
- Ambiguously Bi: Although some artwork depict him as potential new interest for Fionna, but in "Five Short Tables", he seems to have a crush or has feeling towards Turtle Prince.
- Elemental Hair: Red and spiked-up.
- Involuntary Shapeshifter: Turns into a little ball of flame when his temperature decreases too much. He can be touched in this form without injury.
- Mirror Self: Unlike Flame Princess, he's totally good and innocent from the start, thanks to being raised by animals instead of being kept as a prisoner in a Deadly Decadent Court.
- Mr. Fanservice: The first time we see him, he's only wearing a loincloth.
- Raised by Wolves: Flame Prince was raised by his fire lion pride.
- Ship Tease: Fionna and Turtle Prince.
- Wild Child: Although he is not socially maladjusted, just unable to speak the common language. Since he was raised by fire lions, he can speak cat. Cake says he has a really heavy accent.
Mr. StumpsThe Gender Flip of Tree Trunks, as seen in the story "A Penny Burned" from the comic one-shot Adventure Time 2013 Summer Spectacular.
Butterscotch ButlerA Scottish butterscotch butler. The gender-swapped version of Peppermint Butler.
- Voiced by: Crispin Freeman
Not only does Fionna and Cake take place in a gender-swapped fanfic universe, but they also write about a gender-swapped fanfic universe of themselves. Who write a gender-swapped fanfic universe of themselves.
Flynn The Human Being
- Foil: He is this to Fionna. They are both heroic adventurers and fight off an evil wizard that has plans for their land. But while Fionna is an energetic Determinator who isnt afraid to speak her mind, Flynn is a stoic and extremely fancy Flat Character who has yet to get a speaking role or even a Day in the Limelight.
- Spear Counterpart: He serves as this to Fionna.
Jacques The Raccoon
- Foil: He is this to Cake. They are both animal sidekicks to their human compatriot and help them with anything they come across. But while Cake is a sassy cat who isn't afraid to speak her mind as much as Fionna does if not more so, Jacques is a stoic and extremely fancy Flat Character who has yet to get a speaking role or even a Day in the Limelight and doesn't even show off his shapeshifting powers.
- Spear Counterpart: He serves as this to Cake.
- Foil: He is this to the Ice Queen. They are both power-hungry Big Bad Big Bads who are even more cunning than the ice King ever will. But while the Ice Queen is The Sociopath, the Ice President is more of an Anti-Villain and appears to be like a third to Flynn and Jacques' partnership.
- Spear Counterpart: He serves as this to the Ice Queen.
Lynn the Person
- Flat Character: She gets no characterization aside from being in a Show Within a Show alongside Janet.