Kano but the person playing him has to troll the entire audience like alex j did at ncr in SC5 throat slitting gestures spitting and calling everyone bitches.
liu kang, skarlet, cage (i wanna see some1 navigate through the hell of freddy kenshi and kabal, itd be artistry), raiden ( i think this would be an amazing display of skill)
Probably won't happen but I'd like to see Sindel, Baraka, Stryker or Sheeva in there. Totally throw everyone off because some people may not know the match up.