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