Mayumi Saegusa, born December 7, holds the role of Student Council President at First High School from 2093 to 2095. As the third-born yet eldest daughter of the Saegusa Family—a pillar among Japan’s Ten Master Clans—she wields prodigious talent in long-range precision magic, earning titles like "Elven Sniper" for her signature fusion of Multi-Scope, an innate sensory skill enabling multi-angle perception bypassing physical barriers, and advanced spells such as Dry Blizzard, which propels supersonic ice particles. This expertise cements her global standing as a premier tactical magician. Confident yet playfully coy, she interlaces social interactions with subtle mischief, exemplified by distributing bitter chocolates on Valentine’s Day. Though adept at aristocratic flattery, her composed facade cracks when receiving genuine praise from Tatsuya Shiba, a trusted confidant, revealing unspoken romantic tension. This contrasts her discomfort when he compliments others privately. Her father, Kouichi Saegusa, strategizes political marriages to bolster alliances, pushing suitors like Itsuwa Hirofumi and Juumonji Katsuto, whom she rejects. He later manipulates her affections for Tatsuya to undermine the rival Yotsuba Family. Defying familial agendas, she independently joins Tatsuya’s Magian Company post-graduation, aligning with its objectives over Saegusa interests. Petite with elongated limbs and a noted bust, Mayumi’s "natural beauty" coexists with relatable self-awareness about her height and rare public admissions of error—traits uncommon among high-status Blooms. As president, she openly critiques the school’s discriminatory Course system, advocating reform. Post-graduation, she declines multiple arranged marriages. During the Watatsumi crisis, she aids Tatsuya in evacuating test subjects, confronting military opposition. Subsequent actions—assisting Kokoa’s escape and repelling naval forces—underscore her combat prowess and ethical resolve. A skilled magical engineer, her CAD maintenance impresses peers. Blending systematic magic with her innate Multi-Scope, she defies conventional classifications as an irregular magician, solidifying her versatility across academic and tactical spheres.