Cake the Cat

Cake the Cat is the gender- (and species-) swapped version of Jake the dog in the Ice King's self-written fan-fictions, created by Adventure Time character designer Natasha Allegri. She features in the episodes "Fionna and Cake," "Bad Little Boy," "The Prince Who Wanted Everything,""Five Short Tables," and briefly in "Fionna and Cake and Fionna." She is also mentioned by the Ice King in "King Worm" and "Mystery Dungeon."

Cake travels with Fionna, and Lord Monochromicorn is her boyfriend. She has Stretchy Powers and can morph her body just like Jake. As a cat, she also possesses the ability to see in the dark. The fur on her tail stands on the end (or "frizzes out") when there is danger around or when she gets excited (e.g., when Lord Monochromicorn speaks to her).

Adventure Time: Ice King Issue #3
Fionna and Cake are working out in a gym (in Ice King's fantasy), showing off their muscles after their work out.