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