A person who seems superhuman, with astounding powers, can be called an Ubermensch.
This German word, more accurately spelled Übermensch, literally means "overman" and was coined in 1883 by the philosopher Friedrich Nietzsche. The Ubermensch was meant to be an ideal future human and an ultimate goal for humanity. When the concept was translated into English, it was first called "Beyond-Man" and later "Superman." In fact, the familiar comic book hero Superman (who was originally a villain) was directly inspired by Nietzsche's Ubermensch.