Jun Aoi, a key operative of the AVAL Science Foundation opposing the Malthus Church, sports dark violet hair and signature sunglasses, his leather jacket emblazoned with the insignia of the Blue Skull biker gang he commands. His combat prowess centers on blood-forged armaments—massive clawed hands summoned from his back, wielded with lethal precision.

Raised alongside Inuki Akaya in an orphanage, their once-brotherly bond fractured as they aligned with opposing factions. Their rivalry is visually mirrored: Jun’s dark blue hair and rugged aesthetic clash with Inuki’s red locks and medical scrubs. Jun’s choices catalyze the Great Collapse, a catastrophe unlocking latent blood powers in certain individuals.

Charismatic yet calculating, he leads AVAL with a blend of magnetism and ruthless pragmatism, manipulating dimensional gates through finger-snap commands. Haru Minakami, his fiercely loyal subordinate, obeys without question, embodying his influence. Jun’s clashes escalate with Kotetsu Dōmyōji, who seeks vengeance for his father’s monstrous transformation at Jun’s hands.

Betrayal concludes his arc when fellow AVAL member Kaburagi Kark severs their alliance with a scythe strike from behind. His death draws muted grief from allies—Haru’s silent sorrow, a rose laid as tribute—highlighting his duality as both antagonist and mourned comrade.

Rooted in orphanage-era fractures and unresolved tensions with Inuki, Jun’s trajectory weaves personal history into cataclysmic events. Though his methods fuel conflict, traces of humanity linger beneath his strategic brutality, cementing his role as a catalyst entwined with tragedy.