Fionna 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 the series designer Natsha 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 her own stretchy companion, Cake. Also, Fionna's enemy is the Ice Queen.