Finn

Finn, also known as Pen in the original short, is a twelve-year-old boy who goes on adventures with his best friend, Jake. He wears his self-proclaimed "awesome" white hat everywhere. He often shouts random mathematical terms, such as "Algebraic!" despite the fact that in Slumber Party Panic, Princess Bubblegum revealed that Finn is terrible at mathematics. In the Animated Short, it was shown that Finn has feelings for Princess Bubblegum. According to the episode Ocean of Fear, he can't swim.

Appearence
Finn wears a white hat that covers his entire head, but leaves an opening for his face. He wears dark blue shorts and a plain blue shirt. He carries a green backpack on his back, and wears black shoes. When going to the Ice Kingdom he wears a brown turtleneck. It has also been noticed that Finn has messed up teeth. He may be 5 feet tall or taller.

Abilities
Finn is proficent in Kung-Fu, as seen in the animated short. It should also be noted that he cannot swim. He is able to do the science dance which was introduced in Ricardio The Heart Guy.

History
As mentioned in Memories of Boom Boom Mountain, the reason Finn is a hero is because one day when he was a baby he took a "boom boom" on a leaf and fell in it. Ever since then, he cries when he takes one. It is unknown who gave birth to him, just as Flapjack's parents are unknowin in The Marvelous Misadventures Of Flapjack. How he met Jake is also unknown.

Quotes
"Yeah, there's a big sleeping lava man in our front yard... and he is SO hot. Wait, wait, no, I take that back. I mean, not like sexy hot..."

"Algebraic!"

"He's not my dog... he's my friend!"

"My hat... is... AAAWESOOOME!"

"I'll slay anything that's evil, that's my deal!"

"Get ready for an uppercut, you dog!"

"I feel radder, faster... more adequate!"

"Jake this party is sooo crazy!"

" Baby, I know what you crave. "

" Slamacow "

" Science Dance "

"Mathmatical"

"She smells like old hot dog water."

Trivia

 * In the pilot episode/short Finn was named Pen, a name he got from the show's director and producer, Pendleton Ward.
 * In the pilot, Finn is voiced by Zack Shada. However, in the series, he is voiced by Zack's little brother, Jeremy Shada.
 * Even though Finn can't swim in the episode Ocean of Fear, he was seen swimming in a lake in the episode Business Time.
 * Jake says Finn cries when he takes a Number 2.