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