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