Fionna (previously named Fiona or Fionna the Human Girl) is a fictional character 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" and will appear again in the season five episode "Bad Little Boy." She is usually seen in the company of her own stretchy companion: Cake. Fionna's enemy is the Ice Queen.

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