After playing the characters for a few days, I don't think I have any issues with the gameplay aside from a few minor bugs. But the problem I have is that the aesthetics feels rather inconsistent with each other and makes them look like they're missing stuff. It's not just the hitsparks, but the shockwaves and landing effects as well. I also noticed that certain effects and sounds don't play exactly the same as the others. If you want me to point out which sounds are missing on each character, I can. This is how I usually do feedback for others of the same style, not just finding bugs.
It was half laziness to recode the sparks, half trying something different. They only replace the low-res CvS2 sparks the old characters had. The "newer" characters still have the hi-res sparks.Sorry to bring this up again. But now that you said that you don't feel like recoding the hitsparks, why not use these?: https://mugenguild.com/forum/topics/accurate-pots-style-fightfx-default-mugen-186537.0.html
Right now, the lo-res ones don't feel consistent with the other hi-res effects. It still reminds me of the Winmugen days.
I will still do detail and aesthetic feedback for the rest.