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