Do you want to compare Superboy with John Constantine? Discover the powers, weakness & weapons of Superboy and John Constantine from Superboy Biography and John Constantine Biography. Find out all about Superboy and John Constantine.# Check out how is Superboy unique and distinct from John Constantine. Discover their love interest, sidekicks, family tree and the movies and games list in which Superboy and John Constantine have appeared. Find out everything about them here!