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