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