Akahana manifests as a small anthropomorphic rabbit, defined by an angular design of triangular shapes that accentuate speed and panic during movement. This fits the film's modernist aesthetic, utilizing colored outlines in place of traditional black borders. Narrowly escaping a tiger’s pursuit early in the narrative, Akahana is rescued by the protagonist Susanoo, forging their initial bond. When Susanoo departs on a journey after his mother's death, Akahana boards his boat during departure—an accidental companion despite reluctance from Susanoo's other animal friends. Journeying across mythic realms, Akahana serves as Susanoo's primary companion, observing pivotal events like encounters with the King of the Sea and the Crystal Prince. The character exhibits resourcefulness, notably recalling the utility of a protective crystal sphere gifted by Tsukuyomi during the Fire God confrontation; this sphere directly counters the adversary's abilities. Physical expressiveness remains central through exaggerated reactions, such as eye-trail effects during moments of alarm like Susanoo's icy imprisonment, leveraging the simplified design for fluid emotional delivery. During the climactic battle against the eight-headed serpent, Akahana persists as a supporting figure within Susanoo's group. The character's narrative arc concludes with a continued presence alongside Susanoo after the central conflict's resolution, retaining the role of traveling companion.