Mariko Shiratori is a main character in the series *Barom One*. She is a young girl who befriends the troubled protagonist, Tatsumi, who carries a dark secret from his past. Mariko sees beyond Tatsumi's initially standoffish demeanor, forging a bond and becoming his confidante. She plays a crucial role in helping him confront and overcome his traumatic past, enabling him to move forward. Mariko exhibits a spunky personality marked by unwavering loyalty to her friends. As the story unfolds, she becomes drawn into the central conflict between Tatsumi and the primary antagonist, Tokioka. Throughout this conflict, she demonstrates notable bravery and resourcefulness, frequently placing herself in dangerous situations to protect those she cares about. Even when her own life is threatened, her determination to aid her friends remains steadfast. Her personality traits include strong empathy and attentiveness to others' emotions, often prioritizing their needs above her own. This tendency aligns with patterns of self-sacrifice and focus on supporting others. However, it can challenge her ability to maintain personal boundaries and practice adequate self-care, occasionally resulting in emotional exhaustion or frustration that impacts her relationships. Available sources focus on her role within the main series narrative; detailed background information and her development in additional media like movies, OVAs, or spin-offs are not documented in the provided sources.