Fuminori Sakisaka

A character from a dark, 18+ Japanese "visual novel" game, Fuminori Sakisaka was medical student at the University of Tokyo who sustained brain damage during an auto accident, causing hallucinations resulting in him viewing the world as covered in blood and gore and people as horrific monsters shaped like amorphous, tentacled blobs of flesh. Fuminori is further destabilized when he meets a "girl" who introduces herself as "Saya". Saya appears normal to Fuminori, while in actuality she is an extradimensional alien creature similar in appearance to what Fuminori sees humans as. Fuminori later falls in love with "Saya" and under her influence, commits a number of murders and begins engaging in cannibalism after he discovers his taste for human flesh.