Hibino Kafka

Kafka Hibino, a tall, 32 year old Japanese man with spiky brown hair, is described with large eyes, a mild goatee, and a muscular physique with a slightly pudgy belly. Formerly with Monster Sweeper Inc., he often wore their grey coverall uniform. His Kaiju Form is predominantly black with cyan energy glowing from cracks, featuring bone-like structures on his head and spine, a demonic skull-face with horns, and cyan eyes. When out of control, his Kaiju Form exhibits exaggerated features like elongated horns and entirely cyan eyes.

Despite his serious dedication in crucial situations, Kafka maintains a comically childish personality, making him an easy target for teasing. He is caring and kind-hearted, always ready to help others, often offering solutions and saving people from danger. He is deeply concerned about not disappointing those who trust in him, feeling insecure when he can't fulfill their expectations.

The horror of losing control of his transformed body, something he feared since childhood, leads Kafka to take drastic measures to end the situation. Fear of hurting his loved ones prevents him from using his Kaiju Form until encouraged by his friend, Kikoru Shinomiya, to trust in his comrades and the Defense Force.

Kafka dislikes being labeled as an "old man" and asserts his seniority when teased about his age. He enjoys the Defense Force, curry, hamburgers, alcohol, and cigarettes (though he refrains from smoking since joining the Defense Force).