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