Roi, codenamed Swift Assassin, emerges from a mobile game and its anime adaptation as a pivotal figure shaped by a perilous past. Once part of an elite assassin syndicate, he abandoned the group at grave personal cost, forging a worldview both shrewd and pragmatic. Yet he defies the ruthless stereotypes of his former trade, treating allies with unwavering fairness.

Bound by Dominik’s orders, he now guards Cleo, a magician, joining a coalition combating encroaching demonic forces and unraveling the enigma of a sacred blade. Initially aloof and somber, his guarded demeanor softens gradually, revealing growing camaraderie and trust within the group.

A master of rapid, lethal precision in combat, his skills reflect his in-game class as a peerless assassin. Though shrouded in a clandestine history, his current loyalties pivot toward safeguarding others—particularly Cleo—with fierce resolve. Official records list his age as 20, born April 1st, though deeper personal chronicles remain undisclosed.