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