Guess who?

He started attending university like a rookie, fresh from highschool, making jokes, practicing his martial arts moves in the classroom and, generally speaking, not paying enough attention to what he must be paying attention, you know, like studying, doing homework and trying to learn. So, soon he found that university life wasn't going to be as easy as he tought, but instead of giving in, he tried his best and succeeded in keeping the pace. He really hasn't changed that much, he is the same soft-hearted and loud-mouthed guy he as always been, but his academical abilities have developed a lot since those early days. I don't think that you'll need anymore clues to get the identity of the classmate I'm talking about.