I tried Saki a little bit in AH1 and AH2, but didn't like her much. I particularly hated the fact that 2A 2B 2C 6HC 5A whiffed a lot at max range. But in AH3 her 2C slides a LOT farther forward, fixing this issue. Another problem was that her 5B kick could whiff over some crouching characters, but again they fixed it by making 5B hit low. I think she's a really well-balanced character now.
I just wish she had some better aerial normals, e.g. give her a 3-frame j.A like Heart instead of making it 5 frames. And improve her options after a 5C clash. I don't like the fact that flashkick is her only good anti-air option. =/
Rework Koufu (623 a,b,c)
*Koufu active frames to be useful as reversals. (probably comparable to air versions of Koufu)
Koufu is already a reversal.