-Meterless Invincible wakeups. I know a lot of people hate on them, but I believe they were amazing.
-I don't mind some of the unblockable interactables, I don't believe the bombs were overpowered. Still, I would preffer if all of them were to be made blockable.
-Keep both stage and screen size, but for the love of god please improve the walkspeeds
-Keep the B3/F3 mechanics, but it would be cool if a few MB specials could wallbounce as well, the way it was seen in some trailers.
-Remove stage transitions, or give us a way to skip right to the end of them
-Keep the single round sistem and the clash, but give a tweak to the later
-Back to block
-4 bars of meter
-Trait system. It would be nice if characters had two traits to choose from, but it is not necessary
-Background bounces
-Please, no run. Although, maybe it would be ok if that were to be Flash's trait.
Now, there is a constant problem in NRS games that bothers me, and that is the completely useless normals or specials that you can find across their games, moves that will never be seen in a tournament or even online because of how useless they are. There are many ways to make moves usefull, even if only for some situations. I hope NRS works on that, I think they have improved on that regard since MK9, but it is still an issue, and I don't want to see that again.
Characters:
Lex Luthor
Hawkgirl
Ares
Cyborg
Edit:
Oh, and please, reduce the safe, comable, 50/50s. I don't mind having 50/50 you can combo out of, or having safe 50/50 that don't lead to combo. Or even having one being safe and the other being a launcher, but please, don't make both options launch and be safe.