Kotaro Takebayashi, a reserved yet intellectually sharp member of Class 3-E, navigates life under the weight of a storied family legacy. Hailing from a lineage of elite doctors, he endured relentless academic pressure, compounded by his brothers’ achievements at the University of Tokyo. Initially ashamed of his placement in the outcast class, he sought transfer through the Asano family’s influence but chose to stay upon discovering unwavering support from classmates and the enigmatic teacher Korosensei, cementing his loyalty to the group.

With black hair neatly parted, round glasses framing a pale face, and a wardrobe of dark gray jackets, light slacks, and brown shoes, his unassuming appearance belies a fervent passion for anime culture. He frequents maid cafés, a hobby he zealously shares with classmate Ryoma Terasaka, forging an unlikely bond through shared eccentricities.

Ranked fifth in class with 447 points, Takebayashi’s analytical prowess shines in science, particularly statistical analysis and risk assessment. He advocated isolating virus-infected peers to prevent oral transmission, showcasing his methodical approach. His technical expertise extends to explosives, mastering demolition tactics and shaped charges, which earned him the moniker “Glasses (Explosive)” during missions.

Collaborating with Manami Okuda, he channels their mutual scientific curiosity into post-graduation research on synthetic universal blood using Korosensei’s slime. Though he respects Gakushu Asano’s intellect, he critiques Asano’s struggle to escape paternal dominance. His interactions with Terasaka subtly steer their activities, while evasive reactions to Taiga Okajima’s explicit discussions highlight his reserved nature.

Pursuing medical innovation, Takebayashi now develops slime-derived solutions for blood compatibility, harmonizing familial expectations with his inventive spirit—a testament to his evolution from pressured heir to independent researcher.