Kaijuu No. 8 is the kaiju form associated with Kafka Hibino in the series Kaijuu No. 8. After an incident grants Kafka the ability to transform into a powerful humanoid kaiju, he becomes known by this designation. The character serves as both Kafka’s hidden identity and a major force in the story, symbolizing his struggle between human duty and monstrous power. Kaijuu No. 8 plays a central role in battles against other kaiju and in Kafka’s efforts to protect humanity while keeping his secret.