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