I assume you’re talking about the male Wii Fit trainer being in the new Smash Bros.
First, we don’t know if he’s playable. But if he is, and he’s just a fancy costume swap for the female Wii Fit Trainer and the two of them have the same moves (she’s not lighter and quicker, he’s not a heavier hitter), then it’s cool. Here’s why: The default is the female character, and the variation from the “standard” is the male. That usually doesn’t happen, at least in Nintendo games.
Of course, we don’t know anything about how he’ll be implemented one way or the other are just useless conjecture at this point. But hey, spandex is spandex, right?
That package. o -o