Chiriko Tsurumi, known as Tsuruko among her childhood friends, serves as a pivotal figure within the Super Peace Busters. Her reserved nature and sharp intellect drive her to approach relationships with logical precision and analytical insight, often balancing criticism with pragmatism. Beneath her stoic demeanor lies a deep empathy and unwavering loyalty to the group, especially in confronting unresolved guilt stemming from Menma’s death. Academically accomplished, she attends an elite school alongside Atsumu "Yukiatsu" Matsuyuki, their partnership strained by Yukiatsu’s unresolved grief and obsessive behaviors. Chiriko steers this dynamic with a blend of patience and resolve, committed to fostering his emotional stability while acknowledging his lingering attachment to Menma. Her role as a grounding presence underscores her belief in his potential despite his struggles. Within the group, Chiriko bridges nostalgia and progress. A symbolic gesture—cutting her hair—marks her acceptance of change while cherishing memories. Though her academic focus and reserved manner initially cast her as aloof, she reveals vulnerability when aiding the group’s mission to fulfill Menma’s final wish, softening her rational exterior with quiet emotional investment. Her critical perspective surfaces in interactions like her dismissive view of Naruko "Anaru" Anjo’s social circle as superficial, yet she suspends skepticism to support Jinta "Jintan" Yadomi’s claims about Menma’s ghost, prioritizing collective reconciliation. This duality highlights her pragmatic problem-solving and subtle attunement to her friends’ emotional needs. Consistently portrayed across media, her arc traces a shift from detached critique to active engagement in the group’s healing. While post-series developments remain unspecified, her core journey emphasizes mediation, duty, and growth, cementing her as a stabilizing anchor within the Super Peace Busters’ intricate bonds.