Shikkui's skin is blue, rough and rock-like, almost as if it were a carapace. He has no visible hair, nose or ears, but he has a wide jagged mouth with a protruding spike sticking upwards on either side of his face, and blue eyes, rimmed with what appears to be thick eyelashes of the same color. Shikkui is a popular heartthrob at Ketsubutsu; he is smooth and cool alongside his friends. Like his classmates, Shikkui works hard to become a hero and believes in the strength of his class.