Banri Niwa, a third-year high school student and member of Group K, sports dark blue hair and sharp purple eyes. A childhood friend and neighbor of Kei Shinomiya, their bond thrives on mutual trust, with Kei regarding him as an older brother figure. During the third Tomodachi Game, "Friendship Hide-And-Seek," Banri partnered strategically with Kei to conceal Juuzou Kadokura in a secure location while coordinating their allies to surveil rival players. Pragmatic and introspective, Banri curates a personal "bible" of life principles, including the tenet *"The experience of losing transforms into a great asset."* He mentors Kei to balance his impulsive judgments with patient observation, advocating this approach to minimize conflicts and cultivate resilience—a lesson rooted in their middle school years, where Banri taught Kei to discern allies from adversaries while staying prepared to act decisively against true threats. As a basketball club member alongside Group K peers, Banri contributes strategic insights during matches, though he operates with quiet restraint, prioritizing measured actions over verbose commentary. Despite his reserved demeanor, allies like Juuzou recognize his keen intellect, underscoring his subtle yet pivotal role in shaping the group’s dynamics.