Aoi Mibuomi, a third-year student at Hyakkaou Private Academy, previously served as student council treasurer. His family's influential lineage stretches back to the Heian period, paving his early path into school politics. Recognized for his capabilities, he secured the treasurer role during his first year. Tall in stature, he possesses short, messy light brown hair and blue eyes. He wears the standard Hyakkaou uniform, consistently pairing an unbuttoned red blazer over a white shirt and black tie with gray-black jeans and brown loafers. Outwardly easygoing and friendly, Mibuomi treats all students with respect. He openly opposes the academy's housepet system and Kirari Momobami's leadership, founding the organization Full-Bloom to dismantle the system and overthrow Kirari. His charismatic presence aids recruitment, specifically targeting Mary Saotome after observing her gambling skill. He orchestrated a high-stakes dice game to pressure Mary into joining, permitting her to keep her winnings as incentive. This affable facade conceals a calculating, manipulative nature driven by personal ambition. He views relationships transactionally, maintaining his engagement to Sakura Miharutaki solely for political and familial advantage. His true nature surfaces when he publicly humiliates and discards Sakura after her critical gamble loss against Mary, displaying cold indifference toward those deemed useless. This act prompts Mary to reject Full-Bloom, denouncing his manipulation. Mibuomi employs psychological tactics to control others, exploiting Ouri Shimiotsukiuri's romantic feelings to secure her loyalty post-Mary's departure. He utilizes intermediaries like Kurumi Kurume to manipulate Mary into rejoining. His strategic acumen shines through in swiftly identifying cheating methods during games and broader schemes to consolidate power, such as recruiting allies at the school festival and silencing dissent within Full-Bloom. A hypothetical backstory interaction suggests he recommended Kaede Manyuda as his treasurer successor upon graduation, cryptically warning Kaede about the repercussions of using women as pawns, hinting at complexities in their dynamic. He maintains a direct rivalry with Kirari Momobami, challenging her once aware she knows his plans. His story concludes without redemption; ambitions eclipse all relationships, cementing his role as an antagonist focused on seizing control of the academy.