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