Kyogai was a very tall, muscular, humanoid demon, possessing grayish skin, black hair, razor sharp teeth, pointy ears, blood red sclera, deep blue pupils and hidden irises due to it being rolled up to the back of his head. His right eye had the Kanji of the number Six, which signified his position as Lower Rank Six of the Twelve Kizuki, but due to being deemed too weak, his rank was stripped and the eye containing his mark was slashed by Muzan.