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