Momozono-Momo is a high school student distinguished by long black hair typically tied in a ponytail, black eyes, and prominent comma-shaped eyebrows. She wears a standard school uniform with black stockings. Her demeanor balances overt laziness with latent capability, most evident in her athletic prowess as captain of the school basketball team, where she commands teammates' respect.

An intense passion for food, particularly sweets, dominates her actions and frequently distracts her. This obsession leads her to openly praise human cuisine, even jokingly vowing allegiance to Momotaro's teachings—the legendary foe of oni—in exchange for treats. Such remarks provoke accusations of betraying her oni heritage from peers like Himawari. Despite her relaxed attitude, she participates in cultural ambassador missions with fellow oni girls to foster human-oni understanding.

Complicating her role is her familial lineage, which traces back to Momotaro himself—the historical adversary of oni. During collaborative initiatives, such as revitalizing a shopping district, she dons traditional tiger-striped "onipan" attire, temporarily embracing cultural symbols she ordinarily avoids. Her interactions include teasing Tsuyukusa over human food and engaging in playful conflicts, like an RPG duel framed as a clash between oni and Momotaro's legacy.