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Cake the cat is the gender (and species) swapped version of Jake the dog, created by Adventure Time character designer Natasha Allegri and featured in the episode "Fionna and Cake." She has Stretchy Powers and can morph her body just like Jake. Cake travels with Fionna, and Lord Monochromicorn is her boyfriend. 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).
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.

from adventuretime.wika.com