Fionna Age 14 Species Human Occupation Heroine, Adventurer Relatives Cake (adoptive sister) Finn (twin brother) Click to see full answer. Also question is, how old is Finn the human? 17 years old Furthermore, how many episodes does Fionna and Cake have? TheDVD features 16 episodes from all four seasons selected by the creatorand more. Likewise, people ask, does Fionna and Cake exist? Fionna is a playable character in Adventure Time Battle Party. A robot ice version of Fionna created by Ice King appears as a boss, along with Cake and the Ice King in Adventure Time: Explore the Dungeon Because I DON’T KNOW!Does Finn meet Fionna?Finn and Jake come back from a battle at the crystal dimension that they happen to be bragging about. Then they happen to spot two girls (Fionna and Cake) fighting a monster. They want to help these two but before they do they jump into action.