Tadashi Kikuchi serves as secretary to politician Ainosuke Shindo, presenting a professional and reserved public demeanor. He operates secretly under the alias "Snake," organizing the underground skateboarding race "S" from behind the scenes. In this role, he manages staff called Capmen and oversees logistics including drone surveillance and security. Born November 22, Tadashi stands 182 cm tall with a slender build, green eyes, and a distinctive mole under his right eye. His purplish-black hair was historically longer during Aiichiro Shindo's lifetime. He typically dresses in formal black suits with a lavender tie, switching to a green bomber jacket, red cap, and black sweatpants for "S" events. Raised in the Shindo household as the gardener's son, Tadashi formed a childhood bond with Ainosuke. He introduced Ainosuke to skateboarding in the estate's drained pool, where intertwined hearts were later carved. Tadashi carries lifelong guilt for this act, blaming himself for providing an outlet that led to Ainosuke's conflict with his family. When Ainosuke's father burned his skateboard, Tadashi—then Aiichiro's secretary—remained silent, declaring he "had no opinion," fracturing their relationship. After Aiichiro's death, Tadashi became Ainosuke's secretary. Tadashi's personality is marked by emotional restraint, loyalty, and self-reproach. He prioritizes Ainosuke's political career and reputation, concealing risks associated with "S" and accepting demeaning treatment, including being called a "dog." His rare emotional displays consistently relate to Ainosuke's well-being. He carries items like hair wax and deodorant for Ainosuke's needs and adheres to a rigid daily schedule, waking at 5:00 AM and often working late. As a skater, Tadashi uses a "regular" stance (left foot forward) and employs a fluid, dance-like style that influenced Ainosuke's technique. Though unranked publicly in "S," his skill surpasses most competitors; he easily defeated prodigy Miya Chinen during a tournament qualifier. He entered the "S" tournament as "Snake" intending to force Ainosuke to abandon skateboarding if defeated, but withdrew upon recognizing Langa's potential to rekindle Ainosuke's original joy. This decision catalyzed a reconciliation, with Ainosuke acknowledging Tadashi's role in his passion for skating. Trivia includes his favorite food (oysters), lack of hobbies, blood type (A), animal motif (snake), and tournament card (Four of Diamonds).