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