Yeah, Mitsu has some nice mixups. The 2KB is what you gotta watch out for when he's got meter, hits low mid mid. The 1A/1A~B is another 50/50. The 1A~B is the mid. His 6B is another 50/50, the 6B hits mid while the 6B~2 hits low (also can combo, so look out for that!). Mitsu isn't too difficult to learn though, so you could figure him pretty quickly in the trainer I'd say, pretty easy character TBH.
I had a lot of trouble doing the CE on my PS3 pad, I use my
Hori Fighting Commander Pro 3 for SCV and the PS3 pad for MK lol. I just do the double hadouken input as quickly as possible though and that usually works out for me, took me about an hour straight to start feel comfortable using it though but you'll get there, it's not too bad. Realistically, I'm going to have to learn Natsu, though I don't know if I'll play her but I have no idea how to deal with her in the time being. Decent mixups, the bomb (which can be avoided from what I understand), and the speed on her makes her really formidable up close...I think she's like Quan though, once you crack her, she's easy to figure out so I
may play her. Quan used to just destroy me, so I took the time into learning him, and now I can't get enough of him; he has HUGE holes though. Dink's playing her so I'll probably give her a whirl lol
But yeah, I think Viola is certainly viable as well as ZWEI, Viola got buffed I believe too so there's that! It's a fun game though, obviously a bit deeper than MK, but not overwhelmingly I'd say - of course the people I know who've been playing the series since PSX annihilate me though lol