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