Kitana does hella damage, has good zoning options, but her normals are lacking.
Scorpion has everything lol, just I'm still going through the cast to understand the game. Definitely a huge leap from MK9. Dude is a monster.
Kung Lao is another one with really good potential. Decent normals, damage, setups.
Sub-Zero is a monster in this game with great normals & very good setups
Mileena has good potential, but DO NOT mention to me that "she can get over 40% meterless because F3 exists". That is one of the slowest overheads in the game. Nonethless, she has good tools, but her normals are on the slow side. I'm using her for now since that's what I went to 1st.
I'm ultimately still deciding, but rolling with what I started with until I find something that stands out in the characters.