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