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