Ralph Macchio is the Karate Kid. Macchio, in our minds, will never be anything other than the Karate Kid. The 'Karate Kid' movies were a big part of our youth, but Macchio was permanently typecast from the moment he decided to take the part. That's something of a shame in terms of the rest of his career, but it's not as if he didn't have the chance to do something about it. He was offered a role that was far removed from his martial arts youth - he just didn't take it.
Macchio could have been the skateboarding kid screaming 'Doc!' and playing the guitar on stage in the 'Back to The Future' movie trilogy - worlds away from 'The Karate Kid.' If the stories are to be believed, he said no because he thought the film wasn't 'serious' enough. It was serious enough for Michael J. Fox, who took it and ran with it. Sadly for Macchio, those 'serious' roles never came looking for him.