|The following information is from the Adventure Time comic book series.|
It may not be part of the same canon or continuity as the animated series.
Adventure Time with Fionna and Cake: Card Wars Issue 1 is the first issue of a six part miniseries by BOOM! Studios starring the gender-swapped characters.
Cake is a Card Wars champ who can’t be beat, and Fionna...is really tired of getting beaten! They set off in search of a challenger who can really test Cake’s mettle. When they stumble across some gamer slugs, they think they’ve hit the jackpot, but these guys have never heard of Cake and refuse to even play with her!
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