For those who doesn't know, this is official. Finn and Jake (and some other characters) has gender-swapped versions.[link][link]
I guess it's no surprise that fans are clamoring over the gender-swapped characters even before their episode came out yet. Hell, I can't blame them.
anywho, they're riding the Balloons [link]
which I should have thought over since they're capable of stealing wallets...
Fionna and Cake (c) Natasha Allegri and Pendleton Ward