Asterion is the Minotaur of Greek myth, the true name of the monster at the center of the Cretan labyrinth, child of of a female human and a male bull. Owing to his unnatural, incompletely human nature, Asterion grew savage, and fed on the flesh of humans. Minos, King of Crete and Asterion's foster father, exiled him to the center of a great maze, from which he could never escape. Every seven years, seven virgin boys and seven virgin girls were sent to the center of the maze, to be eaten by Asterion as sacrifice. When the hero Theseus arrived in Crete, he volunteered to slay the minotaur, and with the help of Asterion's sister Ariadne, did just that.
When Asterion manifests as Yukio's persona, it's not uncommon for him to be drooling blood. He stands around ten or eleven feet tall (not counting horns), and is disturbingly anatomically correct -- and worse, nude.
Yukio's resonance is powerful like a stench. His oft-surging anger guides it: typical sensations include intense heat, the smell of fresh blood, the screams of children, the taste of human flesh, and a general sense of confusion and dislocation, as if one had suddenly found oneself in, appropriately, a maze.