Jake

Jake (full title: Jake the Dog), the deuteragonist of Adventure Time, is a magical dog and Finn's constant companion, best friend, and brother by adoption. Jake has Stretchy Powers, which allow him to stretch and manipulate his body, coming in handy on innumerable occasions throughout his and Finn's adventures. He is the son of Joshua and Margaret. Jake is 28 in magical dog years but rarely acts maturely. He and his girlfriend, Lady Rainicorn, share a passion for playing the viola.

Appearance
Although Jake's normal form is a gold-colored English bulldog with large, characteristic eyes, he can morph into all sorts of fantastic shapes, thanks to his Stretchy Powers. He also wears invisible pants made of spider webs spun by pixies.

Abilities
Jake's Stretchy Powers enable him to modify the size, shape, and dimensions of every part of his body. Not only can he stretch and contort himself into highly specific forms, but he can also rearrange his internal organs. In "Evicted!" he was able to shrink and move his internal organs and blood into his left thumb. One frequent use of his powers is Key Hand, which he uses to pick locks. As shown in "Mystery Train," he is also able to stretch himself to "create" an entirely new person, as long as they remain connected to him. Jake can be stretched by force as seen in "Ocean of Fear," when Finn stretched Jake's ears to avoid making contact with the ocean. Pen Ward has said in an interview that Jake uses his powers lazily and doesn't know their full extent. In "The Witch's Garden," Jake claims to have obtained his powers by rolling around in a magical mud puddle as a puppy, although it's uncertain whether this is actually true.

In the episode "The Limit," Jake's Stretchy Powers are put to the test. It is revealed that while Jake can stretch his body to incredible lengths, he does have a limit. As he approaches this limit, his body becomes dangerously thin. Once his mass is distributed along a certain length of his body, it becomes difficult for him to support himself; at one point, Jake was forced to walk along the ground. If he were to stretch beyond his absolute limit, it is presumed that he would completely thin out and die.

Being a magical dog, Jake, perhaps unsurprisingly, also has an acute sense of smell, as he can apparently smell the precise location of an object miles away. He also owns a sword and an axe but seldom uses them in combat. In "Mystery Train," when disguised as the Conductor, he briefly uses a sword to fight Finn, who effortlessly defeats him. This demonstrates that Jake is not proficient in swordplay, at least relative to Finn. Jake also has a supernaturally powerful imagination (on the verge of having psychic powers) as seen in "Rainy Day Daydream." Anything he imagines becomes reality; however, only he can see his own creations.

Jake is also a skilled musician, particularly with the viola, which can have peculiar effects when playing certain pieces; he is able to summon snakes when he plays the first movement of "Eine Kleine﻿ Nachtmuzika" by Mozart. Jake also plays the acoustic guitar, as seen when he plays the titular song in "Susan Strong." In "Death in Bloom," Finn describes Jake as "the musical one." However, in "What Was Missing", he breaks his viola himself, as seen in the 30-second trailer.

In "Freak City", Jake claims he can sense when Finn is about to cry and says, "It's like a mother-daughter thing." Apparently, Jake can also calm down Finn with his saliva.

Jake is fluent in Korean, which he uses to communicate with Lady Rainicorn. In "Her Parents," he also writes a note to and later greets Lady's mother and father using Korean.

Personality and character traits
Jake is generally laid-back and tends not to worry about things. He relies heavily on his powers (or Finn) to get him out of any predicament he gets himself into, which is often. He often cracks jokes at serious times, but if Finn is feeling disheartened Jake always has a lecture or a song to cheer him up. Acting as Finn's world-wise mentor, he is always willing to give input and advice about a situation, but his suggestions are usually inconsistent; they range from encouraging a helpful, fresh perspective to ridiculous nonsense. He can be somewhat irresponsible at times, frequently leaving Finn to fight most of a battle on his own, but he always pulls through when he is needed most. Jake may also be dyslexic due to the fact that he writes backwards, as shown on his note to Finn in "Storytelling."

Jake also is somewhat musical. The biggest factor is how he plays the viola a lot. He has sung a couple times, the most notable time being shortly after the House Hunting Song, when he sings to Finn a song about home being "where your heart is." In the episode "Death in Bloom," Finn even says that Jake is the "musical one" out of the two of them.

At times, Jake can be a bit dark when compared to Finn. Throughout the series, Jake makes some questionable comments and actions that may come off as evil or selfish.
 * In "City of Thieves," Jake makes several attempts to steal a pair of boots and succeeds to eventually, even after being warned not to do so by Finn. However, he was under the influence of the city at the time.
 * In "The Eyes," Jake seriously asks Finn to just kill the horse that was staring at them, much to Finn's disbelief.
 * In "Freak City" when he and Finn arrive at the city of the Rump People, he states that he'll go in town to save only the baby Rump People, imply that he would ignore anyone else in need of his help.
 * In "The Duke," Jake suggests Finn not tell Princesses Bubblegum that he made her bald and green, but instead blame it on the Duke of Nuts. He also tells Finn that some of the deeds the Duke has were bad when that is not entirely true, but it's very possible he didn't know for sure and was only going by PB's word.
 * In the episode "Susan Strong" he says "We can rule them like gods! Angry gods!".
 * In "Donny," Jake shows a more violent side when he threatened to gore Donny with the horns he sprouted however this was because Donny deeply upset Finn.
 * In "Wizard," Finn tries to wake up Jake by using a spell to help him subdue a meteor before it hit the wizard village and killed them all. However, Jake reflects it with a spell and ignores Finn, while he could have helped him.
 * In "Conquest of Cuteness," after seeing the Cuties cry after horribly failing to attack their house, Jake suggested they step on them.
 * In "Power Animal " at the end Jake said "Now let's go eat Cinnamon Bun."
 * In "Apple Thief," Jake states that he used to hang around a shady tavern in the Candy Kingdom when he stole old ladies' purses; though he said he didn't know it was wrong. Jake also says that the place where he used to sell stolen bikes was close to the Jaybird gang's headquarters. Yet again, Jake said he didn't know stealing bikes was wrong.

Finn
Finn and Jake are best friends and brothers. They will go out of their way to protect each other. Jake watches over Finn using his stretchy powers to protect him, whether it is shielding him from rain or cold weather, or catching him in mid-fall. Jake is fully aware of Finn's crush on Princess Bubblegum and even helps him try to win her over. Having been raised together by Jake's parents, the two share a brotherly companionship. Jake often acts as a force of guidance in Finn's life, giving out whatever advice he sees best. Though they have seemingly contrasting personalities, Finn's manic hyperactivity and Jake's genuinely lazy demeanor, the pair make an excellent team and are immensely important figures in each other's lives. It is known that Jake is not Finn's dog, but rather his friend.

Lady Rainicorn
Lady Rainicorn is Jake's girlfriend. According to her official bio, they get along so well because of their shared interest in the viola.

Jake is fluent in Korean, which he used to communicate with Lady. A loyal boyfriend, Jake often stops adventuring to make time for her, meeting her every day at 4:00 PM on the dot.

In "Go With Me," they are seen kissing at Couples Only Movie Night. In the episode,"My Two Favorite People", Lady also recalls a time when she and Jake ran naked through a farmer's field, causing them both to blush. This may indicate some level of intimacy in their relationship.

Jake feels threatened by and becomes jealous from other males' intimacy with Lady. For instance, Jake storms off when he misinterprets Finn and Lady's budding friendship in "My Two Favorite People." Another example comes in "Video Makers," when Mr. Cupcake flexes his muscles at Lady Rainicorn instead of acting out a wedding for Jake's romantic comedy. Jake says that he told him to say the lines instead of flexing out, who instead responds "I don't hear her complaining," which provokes Jake into attacking him.

Tree Trunks
Jake and Tree Trunks share a close relationship, which is similar to a grandmother-grandson relationship. This is shown most of the time, though there was a situation in the episode "Tree Trunks" when she kissed him several times so that he would let her help Finn. Jake appeared later with lipstick marks all over his face, and he was smiling. Later, Tree Trunks tells Finn that she'll accept his apology (Finn had earlier yelled at her) if he would let her kiss his cheek. Finn was about to decline the offer when Jake says "Whoa, let her kiss your cheek, man! It's a once-in-a-lifetime opportunity!" Other than this, there are no references of an unlikely romantic relationship between Jake and Tree Trunks, although they remain close friends.

Marceline
Jake initially has a fear of vampires, which makes him terrified of Marceline. Marceline can't help it and likes to scare Jake, but in "Henchman," Jake will not accept the fact that Marceline is not evil, and almost murders her by exposing her to sunlight. However, by Season Two, Jake seems to have accepted that she is not evil and has gotten over his fear of her, as evidenced by the fact that Jake was in Finn's pocket during the events of "It Came from the Nightosphere," and because Marceline attends Finn and Jake's party in "Power Animal" and movie night in "Video Makers." In "Go With Me," Jake says his fear was based on "ignorance." As shown in "Heat Signature," Jake is now friends with Marceline and visits her house to watch movies. He also is concerned when Marceline is in danger in "Memory of a Memory." They have become close friends.

Princess Bubblegum
Jake is very aware of Finn's crush on Princess Bubblegum, so Princess Bubblegum and Jake have a rather strange relationship. They are good friends, though. Jake and Princess Bubblegum rarely speak to each other, but as shown in "Mortal Recoil," Princess Bubblegum likes it when Jake sings songs.

Ice King
Jake is Ice King's ex-husband. However, this happened by accident, and was never willfully married to Ice King.

Family
Joshua and Margaret are Jake's parents who first appeared in a flashback in "Memories of Boom Boom Mountain." Confirmed on Pendleton Ward's Formspring, Finn and Jake's parents are dead, although when or how they died has not been revealed. During his flashback as a child in the episode "Crystals Have Power", Jake was shown to have a brother named Jermaine.

Others
While Finn and Lady Rainicorn are apparently Jake's two favorite people, he has a number of other acquaintances, listed in his cell phone (see Jake's Phone). Shelby, an earthworm and friend of Jake, lives in his viola.

Jake and the Squirrel are enemies, because Jake wouldn't publish the Squirrel's letter in his newspaper advice column, and now the Squirrel wants revenge.

In "My Two Favorite People" Jake befriends a boy named Tiffany in an attempt to get Finn and Lady Rainicorn jealous of him. However when Jake makes up with Lady, Finn fights Tiffany and spits on him, causing Tiffany to run away screaming. Before leaving, he vows that he will still become Jake's best friend, although he has not appeared since.

Jake's Subconscious
Jake's Subconscious is a version of Jake in the episode "The Witch's Garden." He is translucent, and appears to be somewhat of a conscience. When he is first seen, he tells Jake that he is right to think that crossing the River of Junk is hard work, telling him instead, to wear a girly hat. He appears later in the episode dancing with the real Jake with flowers in his underwear in order to get the Witch to accept his apology. He dies because he is the former version of Jake with his magic powers (Jake had his powers taken away by the witch earlier in the episode). He is brought back to life after Jake apologizes to the Witch and gets his powers back. The only two people that can see him are the Witch and Jake, as Finn told Jake to stop talking to himself. Though, Finn could have seen him, and told Jake to literally stop talking to himself.

Conductor
The Conductor is the main antagonist in "Mystery Train." Throughout the episode, he comes and goes during the train ride, and begins creeping Finn out. Not until all other suspects are dead is he actually suspected of murdering all the candy people, because according to Finn, "It's never the creepy guy who's the murderer". After supposedly "murdering" everybody, including Jake, Finn chases him across the entire length of the train. After a short one-on-one battle in the train's control room, he is revealed to be Jake in disguise-via pink and blue paint and his stretchy powers.

Magic Fist
Magic Fist is the disguise Finn and Jake wore in "Wizard Battle" in order to be eligible to compete. See Finn for more information.

Quotes
See Jake/Quotes

See Jake's Subconscious/Quotes

Trivia

 * When Pendleton Ward was asked on his Formspring if the mud puddle that Jake rolled in as a pup was really where he got his powers, Pen stated that it wasn't, and that Jake just couldn't remember.
 * Jake writes a newspaper column titled "Begs the Question".
 * Jake wears invisible pants spun from spider webs by pixies, as seen in the episode "Donny."
 * He does a parody of "Double Rainbow" in a commercial.
 * Jake was confirmed to be a bulldog on Pen's Formspring.
 * Jake has a tendency to steal items without realizing what he is doing, as seen in "The Witch's Garden" and "City of Thieves".
 * During a station break on Cartoon Network, Finn and Jake were voted the best duo of 2010, surpassing Regular Show's Mordecai and Rigby.
 * It is shown that he can play the acoustic guitar in "Susan Strong."
 * In the episode "The Silent King," Finn says that Jake's insides smell like vanilla ice cream, where Jake claims that it is because a wizard cursed him.
 * In "The Jiggler," Jake whistles a song before he and Finn discovered The Jiggler but in "The Real You," he can't whistle.
 * Jake has a gender/species-swapped version of himself: Cake.
 * Jake appeared with Finn in two episodes of Mad. See References in other media for further details.
 * Jake has a bio suit in Project Exonaut.
 * Jake rarely wears his booties while in the Ice Kingdom, mainly because he can't flip the pages of a book with them. He only wore his booties in the Pilot and "The Chamber of Frozen Blades".
 * Jake may have a secret desire to be a foot, as shown at the end of "Freak City".
 * The form Jake uses to play viola with is inconsistent, as Jake holds his viola in his left hand in the episode "Evicted", but holds it with his right hand in the episode "My Two Favorite People", which is opposite from how violas are commonly played. Therefore, it is unknown whether Jake strings his instrument differently, as it would be strung A-D-G-C (to have the strings in the same relative positions), instead of the normal tuning, C-G-D-A.
 * He only has a minor part in the episodes It Came from the Nightosphere, What is Life?, Too Young, and Adventure Time with Fionna and Cake.
 * Jake seems to have a talent for beatboxing as shown in "Slow Love" and "Conquest of Cuteness"