Meh, it's not like he was too noticable in the dub either.
I don't really miss Masato at all, because he didn't do anything to make me miss him.
He did have some REALLY nice moments during his run, but ultimately, he just didn't do enough to make me care. Early AG, the guy was great. The kid ever got his own movie for god's sake, and he was an awesome character in that. And he had numerous moments in mid AG that I found to be amusing too. Late AG and the BF? Not so much.
I didn't really have a problem with him however, and think the kid recieves far too much hatred for no real reason at all.
If there's anything I do miss, it's the potential he had as a character. And there was SO much of it there, that it just wasn't funny. In all honesty, I think Masato is probably one of the biggest cases of potential wastin' this show has ever had. They could have done absolutely anything with his character, but they didn't even try.