Finn the human
Finn debuted at 12, but over the course of the show he has aged, and is now 16. Finn sets off on magical random quests around the Land of Ooo killing anything evil as shown in the Enchiridion episode and would not harm any non evil, not even an innocent ant. Having a strong moral code, Finn swore that he would help anyone in need and often performs heroic feats to save the day; however,[2] starting after season 3, Finn's enthusiastic nature becomes more toned down as the series progresses, suggesting he is both maturing and developing as a character as he ages.
Jake the dog
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According to the series, Jake was conceived when his father, Joshua, was bit by an extra-dimensional creature during an investigation with his wife Margaret. Jake was later born from a pustule on his father's head originated from the creature's bite and was taken by Joshua and Margaret to live with them as if he was their natural son. It is inferred that the characters's stretchy powers that he has had since he was a puppy are a result of his biological relationship with the shape-shifting creature. Little has been shown in the series about Jake's past with his family, but for a while he was known to be a successful criminal until he retired to take part in a more respectable life as an adventurer with Finn, later settling down with Lady Rainicorn to become a father.