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. Many princesses seem to like him or have a crush on him.

Appearance
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 several teeth missing. In a few episodes, Finn is seen carrying a sword, with many dents and scratches. It is made with a yellowish metal, possibly bronze. He may be 5 feet tall or taller. He is rarely seen without his green bag.

Personality
Finn is a brave adventurer, even though he only fights creatures that are evil. In the episode The Enchiridion, he slays Heart Beast, but could not kill the neutral, harmless Ant. He blushes at a compliment Jake makes during the same episode. His face gets red when he is ashamed at himself or really furious. He often loses his temper when other people makes things harder for him and get in his way, such as Lumpy Space Princess and Tree Trunks. However, he apologizes to them during the same episode that he gets angry at them, which shows that he can be caring. Several girls flirt with him or try to kiss him, including Tree Trunks, Marceline, Slime Princess, Hot Dog Princess, and even a couple more. The only one that he harbors a deep crush on though is Princess Bubblegum. Every time a female comes along on adventures, he questions their adventure skill. This was shown in Tree Trunks (episode) and My Two Favorite People. He loves to dance and to have fun. He is very popular in the Candy Kingdom.

Abilities
Finn is proficient in Kung-Fu, as seen in the animated short. He is unable to swim, as shown in Ocean of Fear. He is able to do the science dance, which was introduced in Ricardio the Heart Guy. In the episode The Jiggler, it was revealed that he swallowed a small computer which gave him the ability to sing in auto-tune. He may also be good at origami, which is also shown in Ricardio the Heart Guy, when he makes a paper crane for Princess Bubblegum. He also can make a airplane, which was seen in The Enchiridion. He can snowboard on penguins, and has the fortitude to eat a broom, as seen in Wizard (episode). He keeps everything he needs for adventuring in his backpack. Things kept in it include: a sword, a flute, grapes, a brown turtleneck, and a goblet. He broke his flute picking a lock to a sad ogre's heart, and broke it again in the episode Prisoners of Love. He can spit on a target over a long distance.

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. He also vowed that on that day, he would help anyone in need. It is unknown who gave birth to him. Some of Finn's enemies are:
 * Ice King
 * Ricardio
 * Ogre
 * Dark Magician
 * Shark and Science Cat
 * Marceline, although occasionally friends
 * Tiffany

Jake
Finn and Jake are best friends and will go out of each other's way to protect each other, no matter what. Finn becomes visibly angry whenever Jake is hurt or presumably dead. This relationship existed from the start of the series.

Lady Rainicorn
Finn became friends with Lady Rainicorn after Jake wanted to hang out with both of them at once. This backfired on Jake initially, but seems to have worked out in the end.

Princess Bubblegum
Finn has a rather obvious crush on Princess Bubblegum, often having fantasies about her saying things like, "You're so cute, Finn!" The best proof of this is in Business Time, when Finn does an imitation of Princess Bubblegum in a high-pitched voice, accidentally revealing that he thinks her voice is attractive. He often blushes at things she says to him, as in the episode Ricardio the Heart Guy when, as a joke, Princess Bubblegum asked Finn to kiss her. Finn also got extremely jealous of Ricardio, who was hanging out with Princess Bubblegum more than he was comfortable with. He got so envious that he came up to Princess Bubblegum and Ricardio and interrupted a scientific conversation between the two to ask if Princess Bubblegum wanted to hang out with him, all the while doing the Science Dance to impress her. Finn denies that he was ever jealous, however, constantly making excuses and even shouting, "I'm not jealous! I'm WEIRD!" There was also a chapter in the Enchiridion dedicated to kissing princesses, and Finn blushed as he read it.



Quotes
See Finn/Quotes

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 younger 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 and My Two Favorite People.
 * Jake says Finn cries whenever he poops.
 * Finn's hat has a small resemblance of Bueno the Bear from "Barrista" (a short from Pendleton Ward).
 * Finn is left-handed.
 * His hat somewhat resembles that of the boy's hat from 'Where the Wild Things Are'. Also, the two 'ears' on his hat are portrayed as a cat's ears in Fusionfall.