In order:
Bi Han: As Sub-Zero, Noob Saibot, something in between, or just as Bi Han, no need for him to keep the blue mantle. I don't care how, but get him in.
Sareena: My favorite female character in MK, with an interesting story with ties to both Sub-Zeros, Quan Chi, and Shinnok. I think it would be foolish from NRS not to add her to the roster.
Ermac: He would definitely be on this list, but the only reason he is so high is because there is no doubt his variationFs would be the flashiest in the whole game. Just forget the whole "Jerrod takes control of Ermac" thing, one of the coolest things about him is the fact he is many souls but they all get to work perfectly fine together, making one take control over the rest defeats the purpose of the character.
Fujin: I honestly think he shoul've been DLC for MK9. Both of his previous appearances where in bad games, yet he still managed to be a fan favorite. I can't wait to see what they will do with him in MKX, there is no way he is out
Reptile: There are rumors of him being replaced by a new saurian, and the question there is: why? He has always been a fan favorite of the franchise, and he got such an amazing gameplay in MK9. His looks? I don't care as long as I get a classic human reptile costume as DLC
Havik: I would love to have him higher on the list, because I can't stress enough how much I want Havik in this game. The best new character from the MKDA/MKA trilogy, his nature makes of him a character that could fit in any possible storyline while remaining relevant. There is no excuse to leave hin out.
Cyrax: While I enjoyed playing as Sektor more in the last game, it is the yellow cyborg the one who gained my heart. With so many tools, his variations could be crazy. One thing though, keep the resets. Reduce the damage ny half if you want, but keep them, they are just so cool to look at, and he needz it!
Kai: He sadly didn't get benefited by having a cool redesign in MKA (quite the opposite lol) but I loved his gameplay in MK4, and I still see a lot of potential in it. I sadly doubt he will be in.
I can't decide for the last 3, so I would ask for 2 of this 3:
Ashrah: Her backstory was great in MKD, but it got just so much better in MKA. Adding an amazing desing that fits both her story and personality, and ties to Quan Chi and Shinnok, she has potential of being in on the next game.
Hotaru: His desing is one of the most elegant in the whole history of the series, and a solid story and personality that make him unique among the other villains. He would need redesign for his moveset, maybe give him one more based on the weapon.
Drahmin: I loved his desing and backstory back in MKDA, but his moveset was so bad it hurt. He is not among my favourites, but having the possibility of having him being amazingly redesigned is something I don't want to miss.
My sigs: 
