This papercraft is the Gluttony, based on the anime / manga series Fullmetal Alchemist, the paper craft is desigend by Danimpeo. Gluttony is the second Homunculus to appear in the series, typically being in the company of Lust.
Gluttony, although under normal circumstances is quite docile, is easily prone to bouts of frenzy in which he uncontrollably tries to eat whatever crosses his path, usually someone he has been given permission to eat; which as a result, in both the manga and anime, causes him to frequently ask Lust if he can eat them beforehand. He even asks this question to the people he is fighting at that moment.
He particularly likes eating people and even mentions to Wrath that he prefers eating girls. Despite his hunger-fueled moments of frenzy, Gluttony is very child-like and is surprisingly kindly, demonstrating several times a great love for his siblings and even respects Edward Elric's request for him not to eat Ling Yao.
Gluttony also does not appear to share any of his siblings' disdain for humans, and appears to be unaware that the people he eats die permanently. Because of his childishness, lack of self-control and apparent innocence, Gluttony's intelligence is thus limited in regards to usefulness for his siblings and thus has to be 'babysat' by his more aware siblings. He also seems to share a close bond with his older sibling Lust whom he, prior to her death, was frequently partnered with.
True to his name, Gluttony is incredibly voracious, and seemingly unable to ever satisfy his hunger. However his eating abilities vary between the anime and manga. In the 2003 anime he can simply eat anything using his powerful jaws and acidic saliva. He also shows great strength and some skill in fighting, capable of disarming a skilled martial artist like Alphonse and even giving Scar some trouble.
In the manga, Gluttony is actually a false Gate of Truth which he can activate at will. When activating his gate, Gluttony's stomach and lower jaw opens up, revealing a large eye at its center and his ribs spread out to act as a border for the gate, doubling as extendable teeth. In this state Gluttony can consume everything in his gates eye's field of vision in an instant, which are then transported to an alternate dimension within himself. This endless space exists between reality and non-reality, and is filled with a shallow sea of blood littered with artifacts and remains of the things he has consumed, even the remains of alchemic reactions. The manga and 2009 anime version also shows a highly developed sense of smell allowing him to track his targets with considerable accuracy, even allowing him to fight in the dark.
You can download this paper model template here: Fullmetal Alchemist - Gluttony Free Papercraft Download