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Little Dude is the name given to Finn's hat when it comes to life in the episode "Little Dude." It was given life when Finn dropped it near a flower at the swimming hole in the Cotton Candy Forest, which was growing on top of the head of the Ancient Sleeping Magi of Life Giving. The Magi had buried himself to keep things from touching him, because when they do they're brought to life, but are infused with an evil spirit.
Finn and Jake bring Little Dude home with them, where he attempts to climb on BMO's head and turns all the food on their table into poo. Afterwards, the Magi comes to the Tree Fort, allowing Little Dude to escape to the Candy Kingdom. Finn, Jake, and the Magi follow him, where they find him possessing a Candy Person, who has been warped into a muscular figure by Little Dude. The Magi explains this by saying, "Whomever the hat possesses gains the proportional strength of a hat!"
After a brief fight, in which Finn and Jake were overpowered, Little Dude throws a horse at them, which they dodge. The horse travels through multiple buildings and hits a Gumball Guardian in the back of the head, prompting it to stand up and join the fight, saying, "Evil presence detected!" The Gumball Guardian nearly steps on the possessed Candy Person, gaining Little Dude's attention. Little Dude sees the Gumball Guardian as better than the Candy Person, and proceeds to hop onto his leg and climb up to his head. The Gumball Guardian attempts to brush off Little Dude, repeating the word, "Evil!" multiple times. Little Dude finally makes it to the top of the Gumball Guardian's ice cream cone, where he possess the Gumball Guardian.
Little Dude then starts rampaging through the Candy Kingdom, breathing fire and using runic lasers that cause large explosions. He is stopped when the Magi infuses objects, including a building and Finn's pajamas, with a good spirit by thinking of his mommy, who then climb onto the Gumball Guardian and pull Little Dude off. The Magi returns all of their life forces to himself, but Finn feels sorry for Little Dude, so he asks the Magi to bring him back good. The Magi does so, and Little Dude says, "Whoa, what is this magical place?" Jake replies by stretching into a random form and saying, "Life, man!" Finn tells the Magi to keep good care of him, and the Magi promises to take better care of Little Dude then his father did him.
In "Thanks for the Crabapples, Giueppe," Little Dude is part of Abracadaniel's bus trip to Big Butt Rock with the Magi, Ice King, and other wizards. He mostly provides exposition as to what is happening outside the bus, or what is happening with Giuseppe, the mysterious old man the wizards picked up. He also provides the Magi with encouragement when he has to steer the bus, though the Magi is very tense and swats Little Dude away. In addition, he writes a "spell" (really a short poem) about rejecting the work force. Presumably, Little Dude is now part of the secret society the wizards on the trip were shown to have established at the end of the episode.
Little Dude is Finn's hat which has been animated by the Ancient Sleeping Magi of Life Giving, so he looks just like Finn's hat, except it has four legs and a face. His mouth is where Finn's face is normally shown. It can only say "Nyang" when evil, but can talk normally when he was brought back good.
Little Dude has the ability to possess anyone by climbing onto their head and making them wear him. Who ever he possess gains the proportional strength of a hat, stated by the Magi. Little Dude also has the ability to eat any food and poo it out looking exactly the same as before he ate it. These powers were displayed when Little Dude was evil, so we don't know if he still has these powers when he was re-animated good. He is also a skilled poet, and is implied to be a good swimmer, as he was able to paddle around when the wizards' bus went into a swamp, while the other wizards mostly panicked.