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