シルバー, Absolute Zero

Silver is a Ice Devil Slayer and a member of the dark guild Tartaros. He's one of the Nine Demon Gates.

He died in X774 along with his wife, Mika, but was then resurrected by Keyes, serving as a test subject for his experiments.

It was revealed that his full name is "Silver Fullbusater" "シルバー・フルバスター" and he is the biological father of Gray Fullbuster