Karate Kid (character)

Karate Kid is a superhero appearing in the DC Comics universe, primarily as a member of the Legion of Super-Heroes. He is a master of every form of martial arts to have been developed by the 31st century. The extent of his skill is so great that he can severely damage various types of hard material with a single blow and was briefly able to hold his own against Superboy through what he called "Super Karate".