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