They should skip the invisibility, Reptile already has that variation, and it's also going to be Predators gimmick.
Too many Boomerangs.
Tonfas are lame, and only Talim can pull them off, and she's dead.
Combo extending variation that buffs split kicks, and canon drill, and gives her better normals.
Zoning variation that gives her better fireballs, lets her do her air fireball. Maybe some tricky stuff like slow fireballs.
Grappler variation with a neck snap command grab, an anti air throw.
NRS DLC characters have a tendency to be over designed, and have a huge and diverse kit, and make the older characters look boring in comparison.
So I have high hopes for Tanya.