Daigo Aoki is a second-year student at Tōtsuki Culinary Institute residing in the Polar Star Dormitory. He sports spiky black hair, long sideburns, tan skin, and a well-built physique. Daigo typically wears the standard Tōtsuki uniform unbuttoned and without a tie, frequently pairing it with a simple white undershirt even during cooking, enhancing his tough look. Beneath a rough exterior, Daigo exhibits fierce loyalty to his Polar Star dormmates, defending them from insults and supporting them in competitions. He constantly argues and scuffles with fellow resident Shōji Satō, yet the pair remain inseparable companions. Daigo actively joins group activities, often bothering Zenji Marui and utilizing Zenji's room for dormitory gatherings. He approaches cooking seriously and maintains an underlying warm-hearted nature. In the regiment de cuisine against Central, he pragmatically sided with the faction he believed would most efficiently elevate Tōtsuki's culinary standards. Daigo's culinary skills are competent but lack a specialized style, sufficient to maintain his Tōtsuki standing. Notable dishes include vegetable fritters crafted with fresh Polar Star garden produce, praised by Sōma Yukihira for ingredient quality, and buttered whitefish served to Erina Nakiri. While Erina critiqued technical flaws in the whitefish, she acknowledged his effort to highlight natural flavors; Daigo treated her feedback as a skill-refining opportunity. His background includes passing Fumio Daimidō's entrance test for Polar Star prior to the series' start. He actively participates in dormitory life and the resistance against Azami Nakamura's administration but faces sidelining after failing promotion exams. During the regiment de cuisine, Daigo and other sidelined Polar Star members offer comic relief and exposition while confined. Trivia notes his debut in Chapter 7 of the manga, with his name revealed in Volume 9, marking one of the longest appearance-to-naming gaps in the series. His surname, Aoki, means "blue tree," and his given name, Daigo, combines "big" and "I/me."