ユウ/死の墓キーパー, Death Grave Keeper

A mysterious blond youngster who is an acquaintance of Shuichiro. During Shuichiro's coup d'état and the second Apocalypse outbreak, Yuu is revealed to also possess the Power of Kings when he kidnaps Inori and uses her void to kill Shu only for Gai to save him. Gai recognizes him by the title "Death Grave Keeper".