Finn

Finn the Human
Fiinn Mertens is the main character of the cartoon adventure time

Personality:
Although at times impulsive and aggressive, Finn is a kind, brave, selfless, and righteous boy. His aspirations to become a great hero makes him somewhat of a moral sheriff in the Land of Ooo, as he is willing to help and protect any innocent person or creature. Finn has a very strong sense of responsibility and becomes upset when he is unable to help others. Due to this and being somewhat simple-minded, Finn often feels conflicted when it is unclear whether something is good or evil as exemplified by his dealings with Marceline in the episode "Henchman."

Despite his heroic nature, Finn also takes a liking to "normal life" without any recognition or praise for being a hero and demonstrates this in "Davey."

Finn is also almost incapable of doing anything evil or unjust, and will struggle greatly against doing such things, as seen in several episodes such as taking part in thievery in "City of Thieves" or killing a neutrally aligned ant in "The Enchiridion!." However, Finn undergoes a slight change in "Wake Up" after he realizes that his father, whom he had high hopes of being a great hero, is nothing more than a selfish criminal. This, coupled with the loss of his favorite arm and sword due to his father's selfishness, pushes Finn to the point of wanting revenge. This is shown in "The Tower," where he attempts to go into space by building up a tower so that he could find his father, punch him, and take his arm. However, in the end, Finn learns to control his feelings of revenge with the help of Princess Bubblegum.

While he portrays himself as a rough and tough hero, Finn has a tender side that is capable of love and compassion, as shown by his boyhood crush on Princess Bubblegum and his brotherly relationship with Jake. Finn is also able to act like a gentleman when it comes to ladies. However, Finn seems to hate romantic scenes to the point of vomiting as seen in "Go With Me." However, Finn demonstrates growth in accepting romance and physical love as he willingly kisses Princess Bubblegum in "Too Young" and his latest ex-girlfriend, Flame Princess, in "Burning Low." His tolerance is seen again near the end of "Dream of Love," as he is no longer disgusted by Tree Trunks and Mr. Pigs' passionate kissing. Finn's care for his friends makes him very protective of them as demonstrated when Tree Trunks almost gets killed in the episode "Tree Trunks" and Jake in "The New Frontier." Overall, Finn is a very kind and selfless person who is always putting the safety of others above his own. Jake comments on his adopted brother by saying that "he is a good kid with a kind heart."

In the episode "Rainy Day Daydream," it is shown that Finn believes that "imagination is for turbonerds who can't handle how kick-butt reality is" and that he finds real-life to be better than anything imaginary. Finn then refuses to use his imagination until he has to reactivate Jake's "bombastic personality" in his imagination land, (which was just a basic gray and white empty plane hinting that Finn is not very imaginative). However, this is disputable when the gnomes harness the energy from Finn's imagination in the episode "Power Animal" despite it being inhabited with a few dainty creatures such as Bellamy Bug. The gnomes state that Finn's imagination is powerful enough to affect the real world (like Jake's but to a lower degree) and turn on Jake's imagination.

Finn can also be very stubborn; such as in "Memories of Boom Boom Mountain," "Wizard," "Dungeon," "Rainy Day Daydream," and especially in "Another Way." This is likely a reason why Finn is often determined to work without taking the easy way out as seen in "Business Time" and "The Real You." Finn can also be easily tricked, as in "The Eyes" when Jake convinces him that the giant hawks would take the horse to a land of sunshine and love stuff and take care of him. He can get overly angry and yell as in "Trouble in Lumpy Space" and "Tree Trunks," but immediately feels guilt and remorse and apologizes when he can. Finn is also quick to try and resolve problems that he may have caused, such as when he caused Flame Princess to get hurt by the Ice King. Finn is also empathetic and this was developed when he was an infant since no one (except Jake's parents Joshua and Margaret) helped him.

As a courageous warrior and a fearless thrill-seeker, Finn enjoys putting himself in the midst of danger simply because he enjoys a challenge as shown in "Jake Suit." However, he is also shown to have several fears. In "Another Way" and "King Worm," he demonstrates a fear of clowns. Also, in "King Worm," he shows a fear of Bubblegum calling him too young. In both "King Worm" and "Ocean of Fear," Finn has an unexplained phobia of the ocean, or thalassophobia, despite the fact that he can effortlessly come into contact with any other body of water. Other fears that Finn has are the Ghost Lady, King Worm, and the Lich. Finn's fears change in "Billy's Bucket List," after he destroys Fear Feaster, a manifestation of his fears, with his grass sword while attempting to go into the ocean to fulfill Billy's wish. The Fear Feaster's death seems to have eliminated all of Finn's fears, or at least his fear of the ocean.

Despite being mischievous from time to time, Finn is a very kind-hearted person. It's shown multiple times that he shows clear concern for others, even for those who have willingly hurt him, such as in "The Enchiridion," he returned the dollar to the giant (note that this was the very same giant who ate his beloved brother Jake and even kept insisting that he was dead). Furthermore, he shows clear contempt for anything that is done out of immoral reasons and a consistent drive for righteousness—to "do the right thing."

Finn, like his brother Jake, is also afraid of unknown vampires, as shown in "The Empress Eyes" when he hears Ice King breaking twigs. Thinking that it was a vampire, he starts throwing vampire hunting sticks into thin air.

Finn is also shown as willing to sacrifice himself in order to save others, as seen in the episode "James." With all other plans of escaping the Oozers showing no promise, Finn offered himself as a sacrifice without hesitation, so the others may escape. Though, He was knocked out and Princess Bubblegum convinced James to be the sacrifice instead.

Weapons:
Here are the swords finn fightet with:

Scarlet:
he golden sword of battle (also known as Scarlet) is Finn's weapon of choice throughout most of seasons one and two. The blade is dented, chipped, and dirty. Its hilt is black with some worn leather grip-straps and a red gemstone in the pommel. In "Business Time", the Business Men polish and sharpen the sword, making this episode the only one in which the golden sword appears to be in excellent condition.

In "The Real You," the golden sword passes through the Bubble creator and becomes four-dimensional. When Finn uses the 4-D golden sword to attack the black hole he created, Finn's golden sword is sent into the Cotton Candy Forest by the explosion. Finn is without a sword until "Mystery Train", which could mean he lost it after the explosion.

In the video game ''Adventure Time: Hey Ice King! Why'd you steal our garbage?!!'' this sword has a name, Scarlet and Jake refers to it as "she."

In real life, there is a toy version of the golden sword.

Root Sword:
n "Mystery Train," Finn obtained the root sword (the name is non-canonical), which became his primary weapon. He finds the sword on the caboose of the train and uses it to attack The conductor. He next uses it against the Monster in the beginning of "Belly of the Beast". It is seen briefly in "Mortal Recoil," when Finn throws it at Ice King, "Conquest of Cuteness," and in "Jake vs. Me-Mow." After breaking the Finn Sword, he can be seen using it in "Normal Man" and "Elemental". It can be seen again in the Issue 1 (although the comics are non-canonical).

Finn keeps it in a makeshift pocket on the side of his backpack. The sword gets its name from its root like handle, that seems to be comprised of 2 main "roots" spiraled around one another. The actual blade is a slightly pinkish tone of silver, double sided, and in good condition with the exception of a small chip on one of the blade's sides.

Grass Sword:
The grass sword first appears in the episode "Blade of Grass," where it comes to replace the broken demon sword. Finn buys the grass sword for three dollars from the Grassy Wizard. Finn discovers that the sword is cursed when it begins following him around and tries to bind to his body. When he accepts the sword's curse, he gains greater control over its abilities. Finn wore it around his arm and could extend it into a sword at his will. It ultimately ripped off Finn's right arm when it tried to save him from the Citadel in pursuit of his father Martin and some of the multiverse's worst criminals. When Finn's arm grew back in "Breezy," his new arm was actually one made of grass hidden under his skin. His grass arm has the ability to burst through his skin and control itself like the grass sword. The Grass Sword can no longer be used as it took control over and manipulated the Finn Sword to make the character Fern. A reaction to when Finn tried to regain control over it so it would not kill a beloved character.

Finn Sword:
The Finn Sword is a sword that Finn obtains in "Is That You?" It replaces the grass sword. The sword is created when Finn prevents himself from waking up Jake to save Prismo. However, it is first seen in "Breezy" when Finn imagines Princess Bubblegum holding it. This sword appears to have the spirit of the version of himself that he stopped in "Is That You?" inside, and while Finn uses this sword, his physical attributes (strength, agility, etc.) are doubled. In "Dentist," it is seen cutting through giant worms with ease, suggesting it is quite sharp and durable. The Finn Sword can no longer be used as it combined with the Grass Sword to make Fern. After Fern's destruction in Come Along With Me, his remains take the form of a seed shaped like the Finn Sword. That night, Finn and Jake plant the seedling together, which causes a massive new tree to sprout with a remade Finn Sword lodged in the top. Many years later into the distant future, Shermy and Beth find the sword on the top of the tree.

Shark Sword:
In "King Worm," Finn imagined a sword that he planned to use to blast a hole in the wall. However, Finn never got to use it because he thought about a shark trying to bite off his face and unintentionally changed the sword's blade into one. This sword appears to have a hilt similar to the one in the logo.

Demon Blood Sword:
The demon blood sword (or simply demon sword) first appears in the episode "Dad's Dungeon," replacing the root sword as his main weapon from thereon. In the episode, Finn and Jake go to Joshua's dungeon to retrieve their family sword. At the end of the dungeon Finn finds it encased in locks and stone. He breaks it loose and uses it to fight the final monster of the dungeon. The sword is infused with demon blood, which causes Kee-Oth to sporadically appear and plead to Joshua (and later, Jake, thinking he's Joshua) for the return of his blood. The sword seems to be in great condition. Kee-Oth is easily banished away using the spell "Kee Oth Rama Pancake." This message is written behind the handle's wrapper. In "Return to the Nightosphere," Finn spins it in front of the blood mist cloud, and hits Marceline with it, thinking she is Hunson Abadeer. The sword also shows immunity to Marceline's blood mist cloud blasts. In "Daddy's Little Monster," Finn can be seen holding it throughout the video files on Jake's phone. In "Beyond this Earthly Realm," Finn uses it to slash one of the heads from The Dead One. In "Gotcha!" he uses it to save Lumpy Space Princess from the Mirror Finns. It also appeared in "All the Little People" and "Puhoy." In "Vault of Bones" it is shown to be fire-immune. Finn reluctantly broke it in the episode "Play Date" and released the blood inside. In "The Pit" Finn has a duplicate of the demon blood sword made from frozen grape juice, blessed by Shelby. It is used to trick Kee-Oth into killing himself.

Small Sword:
The Small sword is a rapier-like blade that Finn is first seen using in "Do No Harm", when, using it, he tried to wake Susan up from her coma. The small sword Finn uses looks very similar to Rattleballs's sword. The blade is very thin and is meant to be a weapon used to stab, although it is capable of slashing if needed. After the formation of Fern, Finn can no longer use his Grass Sword or Finn Sword, however why Finn chose to discontinue his usage of the Root Sword is unknown. This sword makes further appearances in Elements suggesting that the Small sword may be Finn's preferred weapon, currently. The sword is then used by Sweet P to destroy the Farmworld Lich's hand. Shortly after, the sword was irreparably damaged during Finn's fight with the Grumbo.

Night Sword:
The Night sword was created by Peppermint Butler in "Marcy & Hunson." He gave it to Finn to protect himself from, Princess Bubblegum's family. It is said to be very powerful, as it contains dark magic from the Nightosphere. It has a demonic eyeball and a compass in the middle of it. A thousand years into the future, it is in the possession of a giant, bearded Sweet P. A grey version of this sword is foreshadowed a few episodes earlier in the background cameo of the treehouse.

Pink Jewel Sword:
In "Slow Love", there is a pink jewel sword, with a hilt that is pointed on both sides and a pink gem on the bottom. The sword is seen slicing Finn's bed in half, but Finn has not been seen using it himself.

Sword of the Dead:
Finn wields the Sword of the Dead to defeat Marceline's father in "It Came from the Nightosphere." Finn draws the sword from the Grass Lands before his battle and slits open the pods in Hunson Abadeer's gullet, which he is using to imprison the souls of Ooo. Finn drops the sword while reciting the incantation to open a portal to the Nightosphere.

Steel Sword:
In the episode "Morituri Te Salutamus," Finn picks up a steel sword during his first battle in the Fight King's arena; it is similar to his original gold sword. The hilt has a leather grip and the pommel has a purple gemstone with a tiny pink gemstone slit in the center. The sword itself is in very good condition. It is later seen again in the episode "Still." In "Something Big," Finn uses this sword to defeat Darren.

Being the last Human:
Finn was, for a long time, the only confirmed human in the Land of Ooo. The reason for this is revealed in the episode "Her Parents," as Lady Rainicorn's dad believed that humans were extinct.

Up until "Susan Strong," Finn believes he has never met another human and becomes morose and "soul-searchy" when he thinks about it. However, Finn encounters Susan Strong, a member of a tribe of mutants called Hyoomans. However, in "Beautopia," it is hinted that Susan Strong is unlike the rest of her tribe and may potentially be another human. 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. However, it is unknown if Finn knew about this.

As of "Betty" Finn is no longer the last confirmed human because Betty Grof traveled through time from before the Mushroom War.

In "Billy's Bucket List," Finn is told by a deceased Billy that his father, Martin, is still alive and is trapped in the Crystal Citadel. This prompts Finn to travel to free his father in the episode "Escape from the Citadel," making him one of four known humans in existence at the time.

In "Preboot" it is revealed by a "human plus" Dr. Gross that are more humans outside of Ooo. This is further explained in the miniseries Islands, where it is revealed that roughly a thousand years prior to the main events of the series, a group of surviving humans from the Mushroom War fled Ooo on a container ship (as seen in Stakes) to escape from the vampires, oozers, and a comet. They eventually settled on a secluded island chain far from the mainland. Over the next thousand years, their community thrived and developed into an advanced technological society. While it was a veritable utopia, there were those few who occasionally grew dissatisfied with their rigidly structured lives and attempted to flee the island; these "hiders" were, in turn, hunted down and returned by specially trained "seekers." Finn, Jake, Susan Strong, and BMO went to the islands so that Finn could find out about his past and his species.

Finn for the first time saw large amounts of humans. Finn met his mother, Minerva while on the island. His mother is no longer a human and is now a virtual consciousness (A.I.) due to sacrificing her body in order to treat the human race from a virus. Finn was offered to live on the island but Finn decided to go home to Ooo rather than live with the rest of his species. So after the miniseries Islands, Finn being "the last human" was completely dispelled. Though in the Islands CN Side, Adam Muto stated that Finn being the last human in the world was never the most important thing about him.

Although various other humanoids exist in the Land of Ooo, most have been confirmed by the show's creator, Pendleton Ward, to be mutants, such as Penny, Phil or the Old Man Henchman. According to Pendleton Ward's FAQ page, even Finn is mutated in some way.

Hair:
Finn has blonde hair which is first seen in "To Cut a Woman's Hair," where Finn removes his hat, and long, golden locks of hair flow out. His hair has a glowing sheen and extended his body length until he cuts it off and gives it to the Tree Witch. His hair slowly begins to regrow throughout several episodes until "Another Way" where it has grown to his shoulders. By "The Lich," Finn has grown his hair slightly longer than in its appearance in previous episodes. However, in the episode "Davey," Finn shaved off almost all of his hair for the second time so he can disguise himself as 'Davey', but begins to regrow it in "Little Dude," and the episodes after it. In "Puhoy," an adult Finn is shown to have grown facial hair and his hair becomes curly although since that part of the episode was a daydream it may not be 100% accurate. In "May I Come In?" Finn's long hair is shown to have grown back to around the length it was in "To Cut a Woman's Hair," when Finn takes off his hat while acting as bait to lure out The Hierophant. Finn has once again shaved off most of his hair as revealed in "Temple of Mars" as a result of catching lice from Marceline. Finn's hair became mostly stubble after shaving it. Finn takes his hat off again in "Come Along With Me" unveiling that he has grown back some of his hair since the episode, "Temple of Mars."

Finn appears to not care for his hair much whatsoever, showed in how he frequently cuts it completely bald when asked (such as in "To Cut a Woman's Hair"), and in "Davey" when he shaves and slathers his hair in molasses, while BMO cries and claims Finn's "beauty is destroyed" and then says he looks like "the devil!"

Outfit:
Finn typically wears a Munsell blue ("color #0093AF") T-shirt, denim shorts, a two-colored lime green circular backpack, rolled-down white socks, and a pair of black shoes. Finn's most prominent attire is a white hat with two "ears" (which Joshua calls "nubs") sticking out on top that covers his entire head minus his face. The hat is inspired by a character called Bueno, a bear from a Pendleton Ward comics. Finn can occasionally be seen in variations of his standard outfit. In "Ocean of Fear," his footwear appears to be black booties with white cuffs. In "It Came from the Nightosphere," Finn has a small pocket sewn onto his shirt that he carries Jake in. This appears again in "Davey" where he uses it to hide Jake while Finn steals the keys from the guards as he breaks the former out of jail. During "In Your Footsteps," the Bear wears Finn's clothes, which suggests that Finn has multiple sets of the same outfit, including his hat. However, in "Little Dude," when Finn's hat comes to life and is set free, Jake tells Finn, "Okay, let's go skin an evil bear," which may imply that Finn only had one hat.

Aside from his normal outfit, Finn can be seen wearing a cream-yellow sweater in colder areas such as the Ice Kingdom but would wear his pink sweater made by Princess Bubblegum occasionally. In "Holly Jolly Secrets Part II," he wears a dark blue sweater with Christmas decorations on it and a green scarf. 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. In "Who Would Win," he was shown to wear a different pair with red elastic. Finn sleeps in red footie pajamas that appear in many episodes, but in the animated short, he sleeps in a red sleeping bag in his regular clothes. In the series, the sleeping bag is beige.

Fighting Style:
Finn is proficient in several forms of combat, including hand-to-hand, magic, and swordsmanship. When using hand-to-hand combat, he is an aggressive fighter, combining some forms of martial arts or his amazing swordsmanship skills. Finn prefers overpowering his opponents, but he is also quick enough to understand an opponent's weakness or using his environment to win a fight. He also received training from the old gumball robot Rattleballs which dramatically improved his sword skills and his reflexes to greater levels.

Age:
Finn is twelve years old at the start of the series and progressively grows older relative to the passing of time in real life. As of "Mystery Train" (March 14, 2011), he is thirteen years old. Finn is shown going through puberty throughout the series. This is seen whenever when he screams as his voice cracks. Finn's voice is noticeably deeper at fourteen than it was at age thirteen as a result of his voice actor aging. Episodes with early production codes have Finn with a very childlike voice such as "The Enchiridion!," "Prisoners of Love," " Evicted!" and "Ricardio the Heart Guy."

In an interview in early 2012 (at the end of season three), Pendleton Ward stated that Finn was fourteen.

Finn was later confirmed to be fifteen years old in the second half of Season Five, according to Adam Muto.

In "The Comet," he is revealed to be sixteen years old.

Finally, in "Seventeen," he turns seventeen years old.

Trivia:

 * Finn is technically still the King of the Goblins; the goblins believe his scapegoat, Whisper Dan, to be him.
 * Fionna is finn's genderswap
 * In "Dad's Dungeon," it is revealed that Finn cries rarely; only in devastating situations, such as death or heartbreak (or when he poops as revealed by Jake in Memories of Boom Boom Mountain).
 * Finn and Jake frequently use math terms as catch-phrases and at times censors for curse words. However, they are shown to be terrible at math, as confirmed in the episode "Slumber Party Panic." (Examples of these words include: mathematical, rhombus, algebraic and math). This has seemingly been abandoned as the show progresses.
 * Finn's favorites have been stated throughout the series.
 * Finn's favorite color is baby blue "boy style," as revealed in "The Silent King."
 * Finn's favorite food is meatloaf, as stated in "Still" and later confirmed in "Jake Suit."
 * Finn's favorite song sounds like an alternative version of "Itsy Bitsy Spider."
 * Finn is, to at least some extent, red-green colorblind, as revealed in "Red Starved."
 * When Finn is wearing his doctor suit in "His Hero," he has three Scientific Parasites in his pockets.
 * In "Jake vs. Me-Mow," Finn carries his adoptive mother's music box in his pack and knows her lullaby by heart.
 * "Bad Little Boy," "The Prince Who Wanted Everything," "Princess Day," "Evergreen," "The Diary," "Friends Forever," "Be Sweet," "Orgalorg," "Varmints," "Cherry Cream Soda," "Broke His Crown," "Lady Rainicorn of the Crystal Dimension," "Five Short Tables," "Daddy-Daughter Card Wars," and "Ring of Fire" are the only episodes where Finn did not make an appearance.
 * In the early version of "Daddy-Daughter Card Wars," he was initially going to appear at the beginning of the episode, but this was likely cut for time in the final version.
 * Stormo is a creation partially made from Finn's DNA from the episode "Goliad."
 * Flame Princess is Finn's first and former girlfriend. Jake referred to Princess Bubblegum as Finn's ex-girlfriend in "In Your Footsteps," but Finn replied that they "never went steady."
 * Despite this, Finn refers to Flame Princess as his girlfriend for the first time in "Puhoy."
 * It appears that Finn is the only character so far who ages consistently.
 * At the beginning of the series, Finn's voice is more high pitched, but later near the latest episodes, Finn's voice is a bit deeper from puberty.
 * Finn, along with Jake, are the only two characters shown to die and come back to life.
 * Finn is implied to have died and been revived in the episode, "Something Big," and Jake is killed and revived by Abraham Lincoln in the episode, "Sons of Mars."
 * Despite being the main protagonists, they still have experienced death at one point.
 * There is a secret GPS implanted on Finn's ear by Princess Bubblegum, as stated in "Lady & Peebles."
 * Besides Tree Trunks' pies, Finn also likes Wildberry Princess's meat pies.
 * Finn likes to make lists to remember things, like in "The Real You" and "Five Short Graybles."
 * In "Dungeon Train," Jake says Finn is about 5' tall.
 * Finn may have some driving experience. In "Candy Streets," Finn drives Jake after he turns into a car. (This may only be true if Jake wasn't controlling himself.)
 * According to The Adventure Time Encyclopædia, Finn got his name from Joshua and Margaret as they initially believed that he was a Mudfish as they knew very little about humans.
 * This contradicts with "Min and Marty," where he is revealed to already have the name 'Finn' before being separated from his parents. In the same episode, it is shown that when Finn drifts alone in the raft, there is also a stuffed bear having his name tag on it along with him.
 * In "The Red Throne," Finn says that he has been learning a bit of piano.
 * In "Lemonhope Part 1," it is shown that Finn has been taking classes at a school run by Princess Bubblegum, one of his classes being geometry.
 * In "Dentist," it is revealed that he actually knows his full name given at birth, which is "Finn Mertens," not counting his alternate universe self in "Finn the Human."
 * His Demonic Form is most likely a reference to Slenderman.
 * In the episode "The Vault," it's revealed that one of Finn's past lives was a comet. This could have some connection to the Catalyst Comet. This was confirmed in "The Comet," as the Catalyst Comet was, in fact, one of Finn's past lives.
 * In all of Finn's alternate variants, he eventually gets his right arm removed.
 * Finn has begun to grow facial hair, but BMO plucks it out every morning as shown in "All's Well That Rats Swell."
 * In an Adventure Time comic, Jake questioned how Finn puts random things in his backpack, one thing is a pack of pens. This may be a reference to Finn's original name.
 * Finn's last name is a Dutch variant of the name Martin, which means 'warrior'.
 * Finn's hat has a similarity to the hats Helpers wear, as seen on his mother Minerva's head.
 * Finn's birthmark looks like a flaming sideways teardrop located in a really weird part of his body, as described by Finn in "Crossover."
 * Finn can do the splits as shown in "Imaginary Resources."
 * In "Beautopia" and "Sad Face," he drinks coffee.