I'm thinking that maybe my character has the ability to see in the dark and that can be transmissible to Schro via him touching her. The question is under what circumstances!
The way Schro's power works is that, if your character sees him, Schro is aware that he has been seen. If your character sees Schro despite darkness, Schro's power will alert him that a nonstandard sense has detected him. Then, Schro can see what your character sees, when they see.
Until, like, ten day have passed and your character forgets about Schro.
In the event that your character keeps remembering and picturing Schro in their head, the power will take longer to fade.
To recap: blind people can't see Schro's visual hallucinations because they can't see Schro. People who suffer from Congenital insensitivity to pain and anhydrosis can't feel pain, even if Schro touched them.
But if someone like Daredevil or Toph from Avatar: the last Airbender, sensed him through sound or tremorsenses, Schro can affect what they sense and make them believe people are there, even if there are not. It's all got to do with the victim's cognition.
Erin, with an eidetic memory would definitely avoid touching him after the first time.
Eidetic memory? Oh, dear... if she can't forget Schro and remembers even minute details of him, she is in deep trouble. Cognito hazards have to stay forgotten for the safety of people.