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