Shinnok and Ermac are my picks. Shinnok is just dorky looking and while Ermac is cool, his model doesn't suit my fancy. Needs moar generic ninja outfit and mask.
Reptile is a bit goofy but really it's just because nothing beats umk3 human reptile. Can't get cooler than that really. Johnny needs an alt besides the bulky vest. MK1 Johnny still his best look.
Kitana is beautiful but her stance is off to me. Doesn't look balanced. I feel the same about Tanya from the footage we saw.
I guess I'm a sucker for the simplistic look, most notably Saibot from mk9. I feel that was the cleanest and best overall look and stance in that game. Still pissed he's not here.