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