Since Mitsu is obviously the best SC character and there's nothing really else to discuss there, let's review best movesets instead. Here's my top 5:
1. SC2 Mitsu - kB2, mist cancels, plus frames everywhere, freezing people to hit them with endless 2KBs, it's the best moveset in fighting game history.
2. SC4 Amy - Loved the speed in an otherwise slow game, 2B+K is such a wonderful low, she was really fun. Totally sucks they replaced her with stupid broken Viola.
3. SC2 Taki - I couldn't actually ever use her because my execution sucks, but exorcism rush is so unbelievably sexy.
4. SC3 Xianghua - I already liked her in SC2, and then they gave her 66A+B~G, which is like the best cancel ever. As the world's biggest cancel fan, I approve.
5. SC5 Mitsu - Making 2KB unsafe on hit was dumb, but everything else was great. Loved his BEs, and that they gave him a proper 33_66_99B after ruining him in 4.