Asato Kido (木戸 亜沙斗, Kido Asato) is a human who develops superhuman powers as a result of the demon plane hole opened by Sensui. His ability, "Shadow", allows him to step on someone's shadow and incapacitate them. Along with Yu Kaito and Yanagisawa he seeks the aid of Genkai when his powers appear. It is shown that he also has limited control over his own shadow, using it to spell out his attackers name after he is paralyzed by Dr. Kurame.