Likewise, in " The Chamber of Frozen Blades," Finn and Jake gain ice-ninja skills, but it is unlikely they will use them again because, according to Adam Muto, "They didn't have enough time to commit the incantations and hand positions to memory.

It is revealed in " Susan Strong," that Finn knows nothing of his human parents or any other humans. Jake then says that he wants sausages, he then gets his Sassage Flare, (which Lady Rainicorn told him to only use in emergencies) hoping BMO will see his message.He has some origami skills, as shown in " Ricardio the Heart Guy," in which he makes Princess Bubblegum a paper crane, as well as in " Marceline's Closet," in which he makes a paper airplane. With the help of Jake, Princess Bubblegum, and his other friends in Ooo, Finn is able to keep his world safe – and have a lot of fun at the same time. Even though the candy person the hat possessed was not under its control anymore, he remained muscular, he did too when the Magi brought his shorts to life using his mommy magic, and later when the Magi took back his life forces, the candy person was still muscular; which is probably why he said "Yes! In " Dark Purple," Susan removes her hat and reveals she is a human with a device on her head, making her possibly some sort of cyborg. Instead, he prefers to deal with his emotions by relying on adventuring and violence, which has led him to become emotionally stunted and causes him to make some morally dubious decisions.

Lastly, in " Dad's Dungeon," when Finn stabs the Evil Monster in the eye, he is able to lift it up slightly off the ground and flip it into the pit. About this aspect of Finn's character, Ward said that he chose to "add a little wrath" to add depth to the character. He is also very good at beatboxing as seen in " It Came from the Nightosphere" and " What Was Missing.The reviews rave about how simple and enjoyable the pattern is, making it a great choice for anyone wanting to create a unique and personalized hat. When Finn is wearing his doctor suit in " His Hero," he has three Scientific Parasites in his pockets.

When the glass on the Finn Sword was broken by the Grass Sword, Finn stops using it and instead uses the Root Sword.

Finn also wears white briefs that make their first appearance in " City of Thieves" when Penny steals his shorts at the end of the episode. It is revealed in " Min and Marty" that Finn was born on Hub Island (one of the human-inhabited islands outside of The Land of Ooo) to his father Martin Mertens and his mother, Minerva Campbell. Finn being referred to by others as "Finn the Human" parodies how characters in fictional works with only one name are often referred to fully by both their name and their species (e. In " Obsidian" an adult version of Finn is seen from a few years after the end of the series and he is seen without any prosthesis.