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