Jelan
Aquaman is dead lel
I just wanted to suggest Mileena, thanks for doing it already . She is just great, I've been using her exclusively for quite some time by now.if you are that bored I'd go with Mileena. She has crazy pressure and teaches you how to not make mistakes (all of her specials are punishable). I did this and it actually improved my sub game. Her tools teach you how to condition players to do what you want.
Sub is that kind of player. After initial blows... you have to condition your opponent to do what you want ... be it walk back to the corner... duck by clones etc etc.
Mileena is fierce at this. Her setups mostly have to be on a conditioning case.... and she teaches you the proper way to keep opponents zones without a clone.
To me Sub is the all in one package. He has a good zone game... can work over someone at midscreen.... and is stupid good up close. (not insane like Jax, Cage, Kung but all the same).
So my suggestion would be Mileena or Kitana.... either or.