The self-styled "Captain" governs the riverside community beneath the bridge, donning a green kappa costume to embody his fictional persona as a 620-year-old water spirit. Officiating as both gatekeeper and architect of tradition, he vets newcomers and bestows symbolic nicknames, cementing the enclave’s collective identity. Though outwardly eccentric, fixated on his mythical role, he masks shrewd pragmatism—leveraging clandestine ties to local officials to block corporate encroachment and shield the community from displacement.

His guardianship sharpens around Nino, whose enigmatic arrival on Earth he orchestrated, hinting at a pact linked to her extraterrestrial lineage. Rare glimpses of his unadorned self—shedding the kappa guise during pivotal clashes—expose a steely resolve beneath the playful veneer. This duality anchors his leadership: mediating disputes with theatrical flair while covertly engineering the community’s subterranean expansion, including a waterlogged villa disguised as a cosmic refuge.

Seasonal rivalries, like his spirited contests with Shiro, blend competition with kinship, reinforcing social bonds. Later revelations trace his shadowed history—clandestine bargains, calculated interventions—that quietly safeguard the bridge’s fragile ecosystem. Through layered artifice and unspoken sacrifice, he remains the unseen axis around which the community’s survival turns.