Finn (also known as Finn the Human and formerly Pen in the original short) is the main protagonist of the series Adventure Time.
As shown in "Memories of Boom Boom Mountain," Finn appears to have been abandoned in a woodland during infancy. He reveals that he made "boom boom" (a reference to poo) on a large leaf, fell on it, and lay there crying until Joshua and Margaret (Jake's parents) rescued him from the wilderness to raise him alongside Jake, who becomes like a brother to him (as such, Jermaine is also Finn's adoptive brother). In "Memory of a Memory" a baby Finn is seen singing his Baby Finn Song in the bathroom of what appears to be Joshua and Margaret's house. In "Henchman," when Finn is asked about his parents, he says Jake told him that he came from a cabbage, in jest. In "Susan Strong," Finn states that he knows nothing of his human parents or any other humans.
Status as the last humanEdit
Finn may be the last true human in the Land of Ooo, or possibly the world. In the episode "Her Parents," Lady Rainicorn's dad says he thought humans were extinct. This lends new significance to his title "Finn the Human," as his humanity may be unique in Ooo. Up until "Susan Strong," Finn believes he has never met another human. Finn becomes morose and "soul-searchy" when he thinks about it. In the same episode, Finn encounters Susan Strong. Even though the other members of Susan's tribe of Hyoomens were revealed to be mutants, Susan's identity as a human or mutant is left ambiguous . In "Beautopia," it may be true that Susan is also a human, but it was not confirmed. The businessmen are also likely humans, but their minds have been damaged by being frozen for so long, so they talk like zombies. They also have boils all over their face, which may also be a result of being frozen.
Other "human" characters (such as Penny or the Old Man Henchman) have been confirmed by the show's creator, Pendleton Ward, to be mutants or humanoids.
Fionna is also a human, although she was just a character in Ice King's fan fiction. Ice King was formerly a human, as shown in "Holly Jolly Secrets Part II."