Daigo Aoki attends Tōtsuki Culinary Institute and resides at the Polar Star Dormitory. He possesses spiky black hair, long sideburns, tan skin, and a well-built physique. His typical attire is the standard Tōtsuki uniform left unbuttoned without a tie, often revealing a simple white undershirt even during cooking, reinforcing his tough look. He regularly bickers and spars with his close associate, Shōji Satō. Despite this combative exterior, Daigo displays fierce loyalty towards fellow Polar Star residents, shielding them from insults and supporting them in competitions. He joins group activities within the dormitory, like parties held in Zenji Marui's room. His relationship with Shōji is inseparable; the pair are rarely apart despite constant arguments. Admitted to Polar Star after passing manager Fumio Daimidō's entrance test, his pre-Tōtsuki background is unspecified. He maintains sufficient culinary skill to stay enrolled under the academy's demanding standards, though he lacks a defined cooking specialty. His documented dishes include: - Vegetable Fritters utilizing fresh produce from the dormitory garden, noted for highlighting ingredient freshness. - Buttery Whitefish gently simmered in clarified butter with mushrooms and spring flowers, served to Erina Nakiri during her Polar Star stay. While Erina identified flaws, she acknowledged his effort to emphasize natural flavors, and he accepted her critique as a chance to improve. Physical descriptors note his height as 1.75 meters, weight 69 kilograms, black eyes, and blood type O. His given name combines "big/great" (大) and "I/me" (吾), while his surname Aoki means "blue tree" (青木). Trivia indicates his debut occurred in Chapter 7 of the manga, but his name was withheld until Volume 9, creating an 84-chapter gap between appearance and naming—a record shared with Shōji Satō. Within Polar Star, he contributes to the "Band of Brothers" dynamic known for distinctive personalities and mutual support, particularly evident during challenges like Azami Nakamura's Tōtsuki takeover. The dormitory residents collectively demonstrate resilience through collaborative brainstorming and solidarity in conflicts.