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