How I feel so far:
Jade 5-5
Sub-Zero 5-5
Scorpion 5-5
Liu Kang 5-5
Kitana 6-4
Frost 6-4
Jacqui 5-5
Jax 5-5
Kollector 6-4
Skarlet 5-5
These are what I have right now atm. I haven’t fought a lot of others yet to really have an in depth opinion on them.
I think Yaas Queen is good utility against certain ones though. I just believe that Digital Soldier is her go to variation & gives her more of an all around tool set
Nb4, these aren’t just based on online play. These are both on & offline. Like Scorpion, Subzero, Jade & Skarlet are harder in delay & ping than offline. I know teleport changes how you think in terms of neutral, but it doesn’t stop her wholeheartedly. She low profiles spear with low shot & his spear works as a fireball now in some ways. The teleport says she can still zone, can even hit him out of teleport before it comes out, but she can't get careless while doing it & have to bait it before he makes the read on her. I "do" believe he's a good counter pick against her though if you have an offensive character who struggles to get in against her wall. I just don't think it's a total blow up. She even can jump it on reaction & whiff punish.
Same for Sub’s mix, ex ice ball, slide, & his d1 (for strings). She low profiles the normal ice ball with low shot. The D1 says he can jab punish B24 & disrespect F21+3, but she still keeps him in check in terms of neutral in both variations for the majority of the time in space. She also out footsies him; especially in Dead of Winter. He still has to play the guessing game too because B24 even though he can jab punish since it's -7, she still has B243 (although a high) -3 on block & the amplified upglow kick which is 0 on block by itself but -3 with certain strings. Still, it sets her up to play neutral or plan her next attack. F2 1+3 has some decent pushback from the string on block so he still has to guess whether or not to challenge with d1 or take the safe route which is to block or wait. He can get chippy with D1 against this string when in the corner, but not anywhere midscreen. This very same rule applies to Geras & Erron Black too because they also have 6 frame D1s. Even in thin ice without the Ex Ice ball, her low shot keeps him in check. Even against his slide. He wins the trades with both versions of ice balls, just the ex version absorbs the projectiles if he makes the read. The other options in thin ice aren't as fast as her best projectiles, but they give him more of a full screen presence in neutral. Better chip in thin ice also. Still, he wants to be closer against her. The Ex Ice ball you have to force him to use meter. Once you do that, he's forced to walk you down while you have full control of screen with projectiles & your buttons. Only thing he would be left with are ice ball, b3, b1, & cold shoulder. Fuzzy guarding is key against him too while he's mixing. I still believe he does do well against her, but I don't think he 6-4s her. She does well against him too. That evens out.
For Jade, her being able to shield herself changes the complexion between the 2, but Cassie still does well getting to mid range. B3 and shoulder charge are key with her while being able to walk forward & B2. B3, B2, & shoulder charge all get her close whenever Jade throws an air projectile of some sort. She doesn't mind trading with Jade although most people prefer not to take any damage. The reality of it is though is that against any kind of zoning character, you have to expect some trades. The main reason why she has to move forward against her and fight her closer is because again, Jade's cloaking. So she has to be the one moving in & staying on top of her with her offense. Once she's in mid range, she can play her game & force Jade to overextend herself. Upglow kick stops her if she tries jumping with an areal projectile. She doesn't have issues punishing Jade either. In fact, she blows up her cloaking potion before she can activate it.
Right now the only character I've had issues with is Erron Black. I'm just trying to hold off more because I want to fully understand him & haven't really played him enough outside of the few I've run into before I up & say what I feel happens. I don't want to downplay or give reasons for people to downplay or even get a character unnecessarily nerfed like some forums are suggesting; Cassie included by people who really don't understand the game's system or how she plays. She doesn’t really need anything changed from F4 & the amped version of upglow kick should do what it’s doing. Shouldn’t be punished if she’s spending resources for safety. That's also why I haven't listed some of the others yet; need more experience. These are the characters that I have the most exp with.