This papercraft is Thanatos, a demon in the video game Shin Megami Tensei: Persona 3 (simply Persona 3), which is the third game of the Shin Megami Tensei: Persona series.
Thanatos is the ultimate Persona of the Death Arcana in Persona 3. It first appears near the beginning of the game, when the protagonist first attempts to summon Orpheus. Thanatos emerges from Orpheus' head, ripping Orpheus apart and mercilessly decapitating the Arcana Magician looming ahead. Later, the protagonist can gain accessibility to Thanatos after the Social Link with Pharos is completed.
Thanatos' fusion prerequisite requires all the Personas of the Death Arcana, namely Loa, Pale Rider, Samael, Mot and Alice to perform a pentagon-spread fusion in the Velvet Room. Thanatos also grants the equipment Ring of Darkness, which repels Dark-based attacks, as his Heart Item. Ryoji Mochizuki's true form as Death looks identical to Thanatos, seeing that Thanatos can be the manifestation of Ryoji's friendship with the protagonist during his form as Pharos. [Source: wikia]
You can download the papercraft template here: Shin Megami Tensei: Persona 3 - Thanatos Free Papercraft Download