There's a massive western bias in this leaked roster. I wonder why not many Japanese fan favorites got in?
I'd like to interject to say that there really isn't any "western bias" here, nor for this entire newcomer roster. Isaac and Shadow you
could say would be the ones for the "Westerners", but Geno (and by extension Super Mario RPG as a whole), Banjo-Kazooie, Ken and Chorus Kids (also by extension Rhythm Heaven) are beloved by the Japanese.
If you really look at it, the only characters that have a massive push by the "American side" are Ridley and Dark Samus. Metroid isn't as known in Japan like here in the Americas. I think once King K. Rool got revealed, the "Country Bias" got destroyed.
And to prove that point even more, the biggest character Japan wants right now is Rex & Pyra from Xenoblade Chronicles 2, but even then a lot of Americans and Europeans want them too. Looking at lists that Japan wants, they share a LOT of the same characters we want, too, to an extent. Crash Bandicoot, 2B, Sora, the list goes on, so I don't think there's any "Country Bias" anymore.