Cyber is the easiest to fight Cassie with at least in my opinion, you can zone her out pretty easily. You can EX Ball cancel in between B12*4 or after a B124 on block to check her if she pokes you after it for a full combo. If she jumps at you B1 is usually fine for anti-airing for me but if you're having trouble with her air attacks then you can trip guard pretty easily by walking back a bit then catching her as she lands. If she cancels moves into EX cartwheel on block that's actually good for you because it sends her back about half screen in which case you can go back to zoning as much as possible until she gets close enough that you have to worry about advancing moves and/or armour catching you. If there's anything else just ask, that's just how I play the matchup basically.
This MU against Cassie is a nightmare and I truly believe Commando is the best option for her rush down and range game.
She has high priority over most Kano normals, I'm actually in the lab trying to learn this MU better now.
Her JIP is retarded good, so is her NJP. She controls the air. She has a really good run, so zoning her out is extremely problematic. Especially with the range of her JIP and B1.
When she gets in, she will dominate the true footsie MU. I think she has 5-6 frame D3, with good range, -3 on block. In my experience so far, this makes it very hard to react to her silly 50/50 game when players start with the D3 specifically.
I have BD out of it but then I get blown up by her B1 out of my BD.
Armor I haven't played with, against her up close game yet, although I am aware of some of her gap strings.
Her gun gives her a decent defense in forcing block and working her way in. It's very hard to zone out Cassie. Stupid hard actually.
This MU in general is ass for a lot of characters but its by far probably the worst MU I've had so far against good players.
I really don't have a solid answer other than Commando. Problem is I don't play Commando but I am learning it now specifically for this MU.
I figure the tick throws and parry tools would slow down most Cassie's. So, that's my plan until I find a solution with Cyber.
I don't see it happening though.