Paranoid in example sentence
Think Identity only the personalities do not die when they are killed, all these people are in his head with the exception of the nurses who are indeed real(paranoid schizophrenia), one personality Doctor Eck knows it enough to diagnose it, but the personality called Dr. Ek has an ulterior motive, aka the book of magik, therefore Trevor has no reason to believe that any of the people are not real.