Sumeragi, or Emperor Oni, is a High-Oni with a human-like visage, marked by short blond hair, black eyes, and priestly robes. He lingers near Saltherine Aldarake, monitoring her dormant peach powers while masking his inscrutable intentions. Publicly championing interspecies harmony, he distances himself from fellow oni, covertly orchestrating events to further hidden agendas.

He convenes the Hyaki Kai, assembling formidable ogres to counter Mikoto Kibitsu, the Peach Boy, framing the clash as an existential crisis for their kind. At these gatherings, he strategically exploits alliances, such as disclosing Carrot’s demise by Mikoto to provoke Todoroki of the brute faction, showcasing his talent for emotional leverage. Though posing as Saltherine’s ally, he scorns her principles, probing her limits by provoking her peach eye power—an attack he survives unharmed, defying oni vulnerability.

His enigmatic persona deepens with a concealed past as a demon impersonating an oni. He methodically eradicates others of his kind for undisclosed reasons, while ties to figures like Carrot, his former informant, hint at a sprawling web of spies and puppets. His role in pivotal incidents, including the ruin of Hawthorn Grattor’s kingdom, weaves a broader scheme entwined with Saltherine’s emerging abilities and societal prejudices.

Though his origins and ultimate aims remain obscured, his calculated maneuvers position him as a catalyst for chaos, melding charisma with treachery. His narrative presence amplifies themes of deceit and the tangled dynamics of interspecies strife, all while his true history and ambitions linger in shadow.