King Mayan Baceska, a scion of the royal family governing the interstellar nation of Savan, hails from the planet Aritosca La. Defying societal expectations tied to his status, he enters the Cosmo Academy’s final exam to validate his leadership skills, though he openly declares no desire to enroll formally even if successful. Aboard a derelict spacecraft during the test, he seizes command, orchestrating responses to crises like the vessel’s destabilizing orbit and a virulent unknown contagion.

His leadership blends unwavering decisiveness with a stern sense of duty, yet he wrestles with suspicions toward Tadatos Lane, the protagonist, whom he suspects of being the eleventh impostor due to cryptic knowledge of the ship. This tension underscores his struggle to uphold authority while navigating the group’s escalating paranoia. Post-exam, he concedes his miscalculations regarding Tadatos, offering a public apology that signals matured self-awareness. The ordeal solidifies his conviction that confronting trials is essential preparation for his future reign.

In the sequel *Zoku Jūichinin Iru! Higashi no Chihei, Nishi no Towa*, his narrative culminates in a politically strategic marriage to Chuchu, younger sister of cadet Doricas Soldam IV, thereby binding their respective planetary nations through alliance. This choice epitomizes his lifelong negotiation between personal principles and the demands of royal duty.