Tadashi Kikuchi, known in "S" as Snake. He is Ainosuke Shindo's secretary and the person who originally taught him to skate. During the series, he seems to display a formal and professional attitude in front of Adam, just like a normal secretary. He also displayed a calm demeanor, even when Adam referred to him as a 'dog' due to his position as an obedient servant. Tadashi is unable to display his dissatisfaction with his treatment in the Shindo household. He seems like the person Adam trusted the most, enough to let him know about secret races like "S" and Ainosuke's identity as Adam.