The original comic series was publish in a paperback book called, 'Johnny the Homicidal Maniac, Director's Cut', which is available on Amazon or try your local library or book store.
I believe he is. Also his skin color is more of a sickly yellow like the Mexicans. He is not pale at all.
http://www.tbns.net/georgis./jthm/issues.html
No one really knows, the closest to a last name he has is his initial "C"
http://www.704d.com/bob/jthm/ Here!