Ryu Kaizel emerges as a cosmic antagonist heralded as the "child sent by a black hole," destined to devour all existence and cast it into eternal darkness. Driven by an insatiable hunger to harness destructive energy from anger and hatred, he infiltrates a racing school under the guise of a talented trainee. There, he wields overwhelming power and enacts a ruthless philosophy, reveling in the despair of rivals during high-stakes competitions.

His striking appearance features piercing blue-green eyes marked by crimson half-bow tattoos, framed by wild, spiky brown hair and sharpened teeth. A muscular physique accentuates his attire: a sleeveless gray vest emblazoned with coiling orange dragons, striped armbands, heavy dark boots, and a utility waistband stocked with racing gear.

Central to his strategy is the manipulation of Shiro, a wolf-like entity whose latent ice-manipulation abilities Ryu awakens. By forcing Shiro into feral transformations, Ryu weaponizes the creature’s vulnerability to amplify chaos. His own powers defy nature, conjuring searing flames from his palms while freezing entire landscapes—a duality symbolizing his dominion over opposing elemental forces.

In his ultimate gambit, Ryu orchestrates a cataclysm to erase the universe, only to face defeat in a climactic race against determined protagonists. Solar energy engulfs him during the confrontation, dissolving his physical form and ending his cosmic threat. Though he recognizes a twisted kinship with Shiro’s isolation, Ryu exploits this connection solely to further his nihilistic goals, perverting potential camaraderie into a tool for annihilation.