. He can't use visual hallucinations on the blind, nor can he use audio hallucinations on the deaf. And if someone is blind and deaf, he can't cause them to hallucinate. They can feel his hallucinations, but because they can't see or hear them, it isn't affective and they'll realize it's his quirk. In order for his quirk to work, one has to hear or see it first, because that's when the brain will begin to fill on hallucinate, is after they see or hear a hallucination.

. He has more trouble using his quirk on blind people than on deaf people. Deaf people tend to be more afraid due to seeing something terrifying but not being able to hear. Though sometimes the blind are very jumpy by certain sounds he can make using his quirk.