Monster

The Giant is a major character in the episode "Belly of the Beast" (considering the fact that Finn,Jake, and the Bears are inside him most of the episode). He first appears after waking Finn and Jake by screaming and shooting fireworks from his mouth. The duo initially believe him to be part of a dream, only after it kicks Jake and they hear a cry for help from its belly do the two realize that the giant is real. Finn and Jake resolve to enter its mouth while it was eating some trees. Finn and Jake are surprised to find a colony of partying bears living inside the giant's belly, and after unsuccessfully trying to save the bears from being digested, Finn unwittingly makes a comment about how the only way the Giant could kill the bears for sure would be for him to swallow "some deadly volcano lava." Overhearing this, the monster makes way for the nearest volcano, while Finn and Jake race to get the bears out as fast as possible managing to get every last bear out safely. After the bears were fully patched up (the giant also receiving treatment on his butt and tongue), Party Pat tells Finn that his colony needs a "phat party club to grind in" and that the giant's belly was the best place to do so. Finn tells Party Pat that he and his people should replace the fireworks they were previously partying with with "gentle lasers." The giant accepts this agreement and takes the bears upon his gut once more.

Appearance
The Giant is, as his "name" says, a huge sized monster with a chubby pill-like shape, beige skin, and slight body hair. His eyes are yellow with red dots for pupils. His limbs are disproportionately thin in comparison to his body, and contain four fingers and four toes on each hand and foot, respectively. It can also be inferred that he has a very slow working, albeit extremely resilient, digestive tract. He is seen to consume whole trees as well as molten lava without consequence, and contains the partying bears for more than three days without digesting them.