Kawa, one of three supernatural entities entwined with the protagonist’s journey, begins as a chaotic force before evolving into an unsteady ally. His frog-like visage, green-hued skin, and wiry frame contrast sharply with the hulking Iwa and diminutive Mame. Though his design subtly evokes traditional kappa motifs—water spirits linked to mischief in Japanese lore—his features remain distinctly original, avoiding direct replication.

Exiled from divinity for violating sacred laws, Kawa atones by guarding the protagonist alongside his companions. His personality balances gluttony and cunning, frequently sparking turmoil through pilfered meals or impulsive antics. A recurring gag involves his fish-induced flatulence, triggering slapstick mishaps. Yet beneath his self-interested veneer lurks loyalty, surfacing in crises—such as steering a storm-tossed boat to fetch life-saving aid.

His arc progresses from sly antagonism to grudging teamwork. Early encounters dismiss human fragility, but prolonged exposure to the protagonist’s raw grief and guilt over fractured family bonds nudges his demeanor toward cautious empathy. This shift peaks when he aids a climactic effort to steer her toward confronting buried trauma, fulfilling the trio’s redemptive mandate.

Symbolism threads through his role: the name "Kawa" (river) anchors him to aquatic folklore, while his exile mirrors themes of second chances. His blend of yokai-inspired trickery and situational comedy bridges supernatural whimsy with human vulnerability. No expanded lore beyond the film delves deeper into his story.