Korekiyo is a tall, slim student with pale skin and long ocean green hair—he has narrowed yellow eyes, and his mouth is covered by a sage green mask, covering his mouth and neck, with a zipper where his mouth would be—Korekiyo is aloof and somewhat disturbing, but he is also very cool-headed and intelligent—Korekiyo usually speaks calmly and politely, but he nevertheless comes across as somewhat off and makes others uncomfortable due to his strange and sometimes morbid thinking—Sadomasochistic.