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