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