Zari acts as King Leopold's primary enforcer and antagonist in Rainbow Pond, executing the king's commands through intimidation and physical confrontations to uphold authority and social hierarchies—especially against tree frogs like Jonathan's family. As a crayfish, he weaponizes his natural claws during violent encounters, displaying relentless aggression through threats and destructive actions such as coercing Mr. Hopper and demolishing the Hopper residence. His direct conflicts culminate in a fatal battle against the bullfrog Goliath, intensifying the narrative's dark themes, while his cruelty extends to random victims like an elderly snail. Zari's loyalty remains solely devoted to Leopold without deviation. After human activities destroy the pond, he flees with other inhabitants, his fate unresolved.