Name Fionna
Gender Female
Age 14
Species Human
Occupation Heroine,


Relatives Cake (adoptive sister)

Finn (twin brother)

Introduced In "Fionna and Cake"
Latest Appearance "Adventure Time: The Crossover"
Voiced by Madeleine Martin (Adventure Time (TV Series))

Anne Hathaway (Adventure Time: The Movie)

Fionna (previously spelled Fiona, and also known as Fionna the Human) is a fictional character and the gender-swapped version of Finn and created by the Ice King in his fan fiction. She was created by series character designer Natasha Allegri in a series of web comics and drawings. She and the other gender-swapped characters appeared in the season three episode "Fionna and Cake." She is usually seen in the company of Cake, her own stretchy companion also adoptive sister. Fionna's nemesis is the Ice Queen. Fionna is a main character in The Lich's Revenge and the true tritagonist of "The Crossover". She was in one of Finns visions along with Cake.When Finn and Jake found the two girls Fionna was unconscious, but then woke up. Fionna got help Marshall Lee and Ice Queen. She helped in defeating The Witch.


While usually appearing as black dots, her eyes are seen as blue when enlarged. She wears a rabbit-themed hat (similar to Finn's bear-themed hat) with exposed locks of blonde hair. Unlike Finn, her neck and blonde hair are shown. Her outfit includes a teal blue shirt with elbow-length sleeves, a dark blue skort, and high-knee socks with two thin, light blue horizontal stripes at the top. Fionna is a heavier set than Finn (which Natasha referred to as "chubby cute"). She has a green backpack (similar to Finn's) and Mary Jane shoes.


Much like Finn, Fionna is an adventurous fun girl who is always up for an adventure. She is energetic and will never back down from a fight. She is a fun and fearless young girl who lives without limits. She is also very tough and doesn't cry unless it's about something major like death or heartbreaks. 


Cake the Cat

As housemates, adopted sisters, and best friends; Fionna and Cake share a very deep and strong bond. Having been raised together by Cake's parents, the duo share a relationship similar to that of siblings, with Cake watching over Fionna and giving her advice constantly as her older sister. Though they have an unconditional love for each other, Fionna can get frustrated with Cake because of her pushiness, shown especially in "Fionna and Cake." Though she sometimes leads Fionna down the wrong path, Cake genuinely means well for her companion and is usually an encouraging and protecting figure.

Lord Monochromicorn

Being the trusted steed of her crush Prince Gumball and the boyfriend of her best friend Cake, Fionna and Lord Monochromicorn are on good terms and well acquainted with each other.

Ice Queen

Fionna hates the Ice Queen because she is always capturing princes.

Prince Gumball

Fionna used to be in love with Gumball but now she is over him and they are just friends. She has now moved on to Flame Prince.

Flame Prince

Flame Prince is Fionna's boyfriend. She loves him and tries to get used to touching him even when he can hurt her.


Finn is Fionna's long-lost twin brother. Fionna was kidnapped at birth by thugs who had it out for Martin shortly after she and Finn were born, and Martin and Minerva's memory of her was erased by the thugs, leading them to believe Finn was an only child. After being reunited, the twins are inseparable.

Episode Appearances

  • Fionna & Cake
  • Bad Little Boy
  • Fionna and the Flames
  • Marshall vs Gumball
  • Brawl for the Bend
  • King Worm (Mentioned)
  • Your'e Fired
  • Mystery Dungeon
  • OOO and AAA collide Part 1
  • OOO and AAA collide Part 2
  • Finn-ona
  • Ice AAA baby
  • Gender Grab
  • Love Boat
  • When we grow old (As a teenager)
  • Adventure Time: The Crossover

The Ghost of Christmas Present

In "The Adventure Time Christmas Carol," Fionna is the Ghost of Christmas Present. She wears a white robe with
Fionna as the Ghost of Christmas Present
a wreath with candles on top her bunny-themed hat. She takes the Lumpy Space Princess to see scenes of holiday joy.


  • Her real name is Finley but she hates that name so she has everyone call her Fionna. First it was that she had everyone call her Penny which was only seen in the Fionna and Cake Pilot episode.
  • Her name was officially changed from "Fiona" to "Fionna," the pronunciation, however, was unchanged.
  • Similar to how Finn had a crush on Princess Bubblegum, it is revealed in many portraits posted that Fionna had a crush on Prince Gumball.
  • Fionna was wearing her casual clothes underneath her dress, as seen when her dress rips.
  • A skull wearing her hat is shown in "Beautopia" shown above the decaying corpse of a cat.
  • Fionna is strong enough to lift and hold Prince Gumball, similar to how Finn can lift up Princess Bubblegum.
  • In Fionna's description on the Cartoon Network website, she is referred to as an alternate version of Finn, rather than a fanfiction character.
  • In the Fionna and Cake comic, Fionna has one of Finn's swords, although, Fionna has only been seen using the Crystal sword and Kitty litter Sword.
  • She was briefly mentioned in "King Worm" when the Ice King was in trouble and mistakenly used the gender-swapped names when asking Finn and Jake for help.
  • In the Norwegian Dub, Fionna's name was changed to Linn.
  • When Natasha Allegri draws Fionna, she leaves the button on her backpack white. Although, on Finn's backpack, it is green.
  • When Natasha Allegri draws Fionna in the comic, she, sometimes, doesn't draw the lines on her socks.
  • In the French dub of Adventure Time, Fionna is voiced by the same actress who voices her male counterpart, Finn.
  • Fionna's Crystal Sword is very similar to the Starfury from Terraria.
  • Fionna's friendship with Marsha is similar to Finn's relationship with Marsha genderswap, Marsh.
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