5) Lady Deathstrike
Of all the characters listed here, it could be argued that Lady Deathstrike was perhaps handled better than them all. However, the fact that she was little more than Stryker’s mind controlled pawn meant that she had little to no personality, despite that downright awesome fight scene with Wolverine at the end of X2: X-Men United. Of course, with a new timeline in place, the events of that movie never happened, and Kelly Hu being recast obviously makes the most sense.
It’s hard to say where Deathstrike could show up; Wolverine’s next movie is certainly one option, though there’s a risk that will feel like a retread of old ground. The Deadpool franchise could do something fun with her, but having the villain given some much needed personality as a big bad and having her face off with the X-Men would ultimately be just as good.