Kaiko-chan is a female demon employed by King Enma in the underworld, distinguished by her orange hair styled into two horn-like shapes and vivid red eyes. She wears a black and white outfit consistent with other demons in her realm. Functionally, she operates as a skilled fighter and strategic planner within her team. Her initial mission dispatched her to the human world to capture a runaway demon, where she encountered the protagonist and his companions. This led to an unexpected collaboration in their quest to locate the Golden Fruit. Despite early reservations about allying with humans, she gradually recognized the alliance’s value.

Her personality merges a tough exterior with an underlying capacity for softer interactions, particularly observed with the protagonist. She exhibits a strong sense of duty, loyalty to authority figures, and organizational precision, alongside tendencies toward anxiety regarding safety and security. Her narrative role evolves beyond initial parameters as she integrates into the core group’s activities, revealing adaptability and deepening investment in collaborative endeavors.