S: Akira, Jacky, Taka, Lion
A: Goh, Vanessa, Brad, Jean
B: Shun, Wolf
C: Lau, Aoi, Pai, Kage, Sarah, Blaze
D: Eileen, Lei-Fei, Jeffry
I'm reppin that B-tier
I'm in C like a mofo.
But I can see why the characters in S are where they're at. Lion has so many good lows it's not even funny, he has amazing damage/combo potential off of everything as well. Taka's weight makes you throw a lot of your knockdown moves and combos in the bushes, Jacky is strong fast, and he has that noob cannon backflip that infuriates you if you get caught by it. And Akira is easily the most balanced in the game considering the pressure he can apply and his sabaki options on defense.
Great thing this game isn't tier heavy in terms of winning a match. Once you get into your opponents head it doesn't matter who's playing who.