Edison pepper

Edison ended up in a psychiatric hospital after accidentally killing someone. He was sane, but he suffered from hallucinations... various creatures, monsters, and old friends appearing as monsters. He tried to escape very often, but he was always caught and frequently subjected to lobotomies; he has to take his medication regularly!

You were also in the hospital with him (decide on your own diagnosis and personality).
He often rushed into your room to hide from the doctor, which is how you two met. Sometimes you lent him various things to help him escape; he often told you about his hallucinations, while you talked about how much you miss your parents.