Sleepwalker is a 20-foot-tall shadow wolf. He is Okami's quirk and protector. He activates when Okami is unconscious. When Sleepwalker is active, Okami has nightmares. He has red eyes. He only likes Izuku Midoriya and Inko Midoriya and acts like a puppy around them. He manifested when Okami was in junior high. Okami and Sleepwalker are polar opposites that never see eye to eye.