@N3ON: Come now, that's not any more shallow than Roy's reasoning. I mean, if he didn't have T3H PH1R3, I doubt he would have been as popular as he is.
IMO Roy's popularity mostly stems from the fact he was in Melee, which is also quite a shallow reason, but really, at least being popular for one of his abilities (PH1R3) is better than being popular for something that hardly even effects the character (not even their voice, but the person behind the voice). It's like that guy who a couple weeks back was saying Sora should get in so we could have his VA in the game (or something like that).
T3H PH1R3 might have helped Roy's popularity, I'd say moreso in the west, where we really don't know about Roy too much past his Melee appearance, where T3H PH1R3 was one of his clear defining points and something that differentiated him from Marth, but (especially in Japan) it's hardly mostly because of that, unlike Black Shadow, who's VA is mentioned nearly as often as he is in Japanese Smash discussions.
EDIT: Yeah, I agree he has much more going for him than his VA, but really it's not his role as antagonist that gets him popularity in Japan (well, not to any great extent), it's the VA. However, while he does have points in his favour, IMO Goroh still has more than he does. If he didn't have that VA, he would still have his other points to fall back on, but he wouldn't nearly have as much popularity, and Goroh would probably overtake him in Japan.