Takamichi Sanzenin, nicknamed "Knight," performs as a member of the idol unit Lancelot at Étoile Vio School, playing trombone and piano during the group's shows. He deliberately projects a haughty, cool exterior of pride and composure. This crafted image clashes with his true stubborn nature and visible reactions to teasing, making him a frequent target for playful provocation by peers like Issei Todoroki and Futami Akabane. His behavior stems from an upbringing in extreme wealth, leading to occasional displays of poor financial understanding through impractical statements or actions. He maintains a one-sided rivalry with Ban Juumonji, who shares a similarly affluent background, creating interpersonal tension driven solely by Takamichi's perspective.