Polka Shinoyama, a timid 16-year-old, carries the legacy of the Shinoyama Financial Group as the second son of patriarch Rozan and Kanon, a woman from another world. His mixed heritage bestows the Elemental Eye, granting sight over elemental spirits, and ties him to the Redrazalf family’s Spirit Eyes. This bloodline also binds him to the Corpse God, a necromancer and half-brother who reincarnates into Polka’s body after the boy’s assassination by contract killer Misaki Sakimiya. Polka’s slender frame, short white hair, and pale blue eyes become vessels for the Corpse God after his death, marked in photos by a black lock of hair and neck scar. His spirit is preserved first in a drone, then a stuffed bonito shark plush from *Sharkborg from Hell*. The toy blushes or trembles with emotion through the Corpse God’s magic, its limited mobility a stark contrast to Polka’s growing confidence as he adapts to this whimsical form. Though socially anxious—especially around women—Polka displays quiet courage, shielding family members as a toddler and later as the shark plush. He forgives Misaki and allows the Corpse God to assume his identity for mutual safety, balancing timidity with resilience. His choice to flee home before his murder hints at unresolved tensions as the Shinoyama Group’s second heir, though internal schemes later suggest his assassination was a familial ruse rather than genuine betrayal. Content in his plush form, Polka jokes about alternative bodies like flight-capable androids, embracing curiosity amid upheaval. His bond with the Corpse God and Misaki fosters growth, easing his social anxiety over time. Shared lineage through Kanon—mother to both Polka and the Corpse God—enables their intertwined fates, their blood fulfilling the necromancer’s resurrection spell. Polka’s Elemental Eye and the Redrazalf-inherited Evil Eye let him perceive and interact with spirits, though he leaves active magic to the Corpse God. Familial relationships remain complex: Rozan later accepts the Corpse God as a surrogate while guarding Polka’s spirit, and nieces like Sayo shift from viewing Polka as timid to respecting his quiet bravery during crises. His journey—from assassination victim to a spirit navigating existence in a toy shark—underscores themes of identity and adaptability. Through loss and reinvention, Polka’s kindness and determination persist, anchoring his evolution from pawn in familial power struggles to an unlikely symbol of resilience.