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