I mean, he hardly ever talks, when he does it's just to show off. he's constantly sleeping somewhere or playing tennis. I don't think he has any other hobbies. I mean, he goes home, plays matches with his dad eats dinner, maybe plays with his cat and sleeps. That's his day
I hardly ever see him show emotion. I've never seen him sad, laugh, embarrassed. Even when he's angry he doesn't show it, his eyes just change. I swear, he's had three expressions on his face the entire series:
The arrogant smile, the angry look, and that sleepy look he has. My god, outside of that, for a main character, his personality's incredibly dull.
His only redeeming quality is that he plays good tennis and he's not planning to be a professional What the hell does that mean. If he stops playing tennis, he'll have no personality at ALL