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 has a brother named Jermaine. Jake is 28 in magical dog years,[1] but he rarely acts maturely. He is probably 14, around Finn's age, in human years. Both he and his girlfriend, Lady Rainicorn, share a passion for playing the viola.
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.Also in Jake vs. Me-Mow, he enlarged his liver 51 times a dog his size preventing him from dying from Me-Mow's poison. 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, but in an interview Pendleton Ward stated that this is not how Jake got his powers, he just could not remember.
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, but that could have just been part of his birthday party possibly making him better at swordsmanship. It is then that he also displays a prowess for skateboarding, as he performs jumps, ollies, and grinds; several atop a moving train.
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, or it is shown that he can control organisms.
Jake is a skilled musician as well, 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. Its also in shown in "Incendium" that he can play ukulele.
In "Freak City," Jake claims he can sense when Finn is about to cry, saying "It's like a mother-daughter thing." Apparently, Jake can also calm down Finn with his saliva.
Jake can also speak Korean, which he uses to communicate with Lady Rainicorn. In "Her Parents," he writes a note to Lady's mother and father using Hangul, the Korean writing system, and also greets them speaking in the formal Korean language.
RT looked up from the Wikia page and found the last two DragonBalls. He handed all his to Cyril.