Born into a prestigious family, Seijūrō Akashi endured a strict upbringing as the sole heir. His mother's death in his fifth year of elementary school intensified paternal pressure, fracturing his psyche into two distinct personalities. The original persona, characterized by monochromatic red eyes and the pronoun "ore," demonstrated respectful leadership and valued teamwork during his early years at Teikō Junior High. He addressed teammates by last names and acknowledged fan support. Fear of being surpassed by the Generation of Miracles and the crushing weight of maintaining absolute perfection triggered an alternate personality. Marked by heterochromatic eyes (right red, left orange/yellow) and the pronoun "boku," this persona exhibited extreme arrogance, a win-at-all-costs philosophy, and violent reactions to defiance—including attempting to stab Taiga Kagami with scissors. The first emergence occurred during a one-on-one match against Atsushi Murasakibara at Teikō, where imminent defeat activated his Emperor Eye ability and cemented his dominance. This shift marginalized the original personality, discarded teamwork-focused strategies, and prompted Tetsuya Kuroko's departure. Akashi possesses exceptional court vision, strategic playmaking likened to shogi, and precise ball-handling. As point guard and captain for Teikō, Rakuzan High, and later Team Vorpal Swords, he commanded effortless authority—evidenced by the Uncrowned Kings' submission to his leadership at Rakuzan despite his first-year status. His signature Emperor Eye predicts opponents' movements by reading physiological cues like muscle contractions and heart rate. The alternate personality initially wielded this power more effectively, its full manifestation marked by a glowing iris ring. During the Winter Cup finals against Seirin High, the original personality resurfaced after Kuroko and Kagami countered the Emperor Eye. Prioritizing team cohesion, he resumed using last names and boosted morale to synchronize Rakuzan's collective entry into the Zone. Accepting his first loss as a catalyst for growth, he became more approachable, displaying considerate behavior like reminding former teammates about diets and health routines. In "Last Game," Akashi captained Team Vorpal Swords (jersey number 4). Both personalities cooperated against Jabberwock: the original handled playmaking and coordination, while strategically invoking the alternate persona to maximize Emperor Eye predictions against Nash Gold Jr.'s Belial Eye. The alternate concluded their split existence limited the Emperor Eye's power and chose permanent merger. This integration formed the Complete Emperor Eye—combining the original's strategic vision with the alternate's predictive prowess—surpassing Gold's foresight and enabling decisive plays. His leadership facilitated Zone entries for multiple Vorpal Swords teammates during critical game phases. Physically, Akashi stands 173 cm tall with spiky red hair and vertical pupils. His eye color reflects the dominant personality: both red for the original, heterochromatic for the alternate. He trimmed his bangs before the Winter Cup and later grew his hair longer, as seen in "Last Game." He typically drapes his jacket over his shoulders.