AKNova7
[10] Knight
Leixia
She needs more damage in general. I think all her main combo starters (3B, FC3B etc) should have a damage increase. 22_88K should have + frames on hit to compensate for the KND, which was removed in 1.02 patch.
(I'll address the other characters in a larger post when I get more time, but I wanted to throw this your way real quick.)
I'm going to ask you to consider something. See, when WR B BE was nerfed in step initiation time, it's main reason was to stop people from being able to absolutely ruin opponents when rising from the ground. Leixia used to be a much more dangerous pressure character because you could Vertical/Horizontal Mix-Up people between her Horizontal Impact (4A+B) and WR B in these situations. However, when they nerfed the step speed, it messed up the frame work. Almost all her attacks (except 2A) that leave her in FC are around -10 or -11. This is because the mix-up I referred to was intended. However, we don't want the option for WR B to be braindead off the ground. So here's what I propose, even though, it'll seem a little strange at first.
Find the new step speed of WR B/BE
Adjust the frames of 1B, 2B, 3B+K, WR A+B B, 3A, 3B+K, BT 2B, and all the rest of the ~FC moves to have the same difference in frames between block and hit to compensate for the speed decrease in WR B/WR B BE
The reason why I say this, is because, honestly, WR B/BE definitely needed to be nerfed. It didn't deserve to be nerfed in Safety, Guard Break Damage, Scaling, Step Speed, and aGI frames. That's a little much. Especially when they didn't take the time to fix the part of the play-style of the character they removed as a side-effect.
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Natsu
4A+B: Decrease radius so move doesn't catch step. I don't have big problems with the move, but the absolute worst thing about this move is that it catches normal step, sort of like Bullrush. That's the biggest problem IMO.
Since it's a single bomb, there has to be something done to make it balanced like the SC4 cannon. Remember, in SC4, if you blocked the first hit of Ninja Cannon, you could jump the second.