You might wonder, who is fionna and cake?
Fionna, Cake and others are basically Finn and Jake; just different genders. Ice King made them up. Some people like Fionna and Cake more than Finn and Jake!
FINN, FIONNA, CAKE, JAKE, PRINCESS BUBBLEGUM, PRINCE GUMBALL, MARCELINE, MARSHALL LEE, ICE KING, ICE QUEEN.
Ice Queen is sooo creepy.....
Some people loved it so much, they made a fan fiction!