Kinnikuman

"Kinnikuman, whose real name is Suguru Kinniku, is a goofy and inept superhero who learns he’s actually the long-lost prince of Kinniku, a planet famous for creating the universe’s mightiest heroes. But because he’s so clumsy and dim-witted, he has to earn his right to the throne. He does this by competing in wrestling matches and fighting against villainous Chojin."