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