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