So I'm looking at the trends from my country (Brazil) and found some interesting things.
This is SonyFAQs. The PS1 is the strongest console here bar none, and everything that had a peak in PS1 has a peak here. Resident Evil is beastly. Castlevania is beastly. MGS is beastly. MMX is absolute god mode. Aya Brea overperforms like crazy, though she doesn't win R2.
Nintendo is moderately weaker, but how weak varies between characters. Ness is garbage here, but stuff like Mario and Zelda, not that much. Donkey Kong doesn't change. Pokemon is moderately weaker all across the board in R1, though Red flips over Sora and Zard flips over Bowser (even though he loses to Terra).
FF doesn't seem to vary from the global trends. Matches involving FF characters have little change. Same for KH. Frog's match had the same results, but Magus flipped over VIncent and got 55%, so either we don't care about Vincent or CT is a little stronger here. Noctis flipped over Hand, though.
PW seems a little stronger too. Don't ask me why.
Sonic is also considerably stronger, for some reason. The only Sonic character who didn't get higher percentage in R1 was Metal Sonic, which stayed the same, probably because of the stronger MGS I mentioned above.
We care even less about modern gaming than the world average. Ramza almost doubled Garrus. K. Rool flipped his match. Glados was weaker despite pokemon being weaker.
All fighting game characters are stronger too. Chun-Li beat Ganondorf, and Ryu hit 77% in his match.
Bomberman is stronger too and beats Kefka in a close match.
MMX is the big winner here. I might take MMX over Link if the contest was limited to Brazil. Both Zero and MMX got nearly 90% in their R1 matches, and Zero got 73% on Knuckles. No idea what this says about Mega Man Classic, though.
I don't know how much you folks care about this stuff but hey, it's stats. I'm posting it because I love stats. Brazil is probably only about 2% of the gameFAQs userbase though, looking at geographical polls, but hey, maybe we help MMX win a close match over Luigi/Tifa.