I don't "want" to bring back Ripley, but it has been discussed on this thread, and there were those Ripley/Ripley's daughter rumours even for covenant, plus a cameo by Sigourney the actress (not neccessarily as Ripley) is always a possibility.
In fact I wouldn't even want Shaw back - whether it was Noomi's acting or the poor script she had to work with, I wasn't that invested in Shaw and I'd really struggle to find myself rooting for her.
I do want a non-android human lead character that I can root for across several franchise movies though. And therein lies the problem. As soon as you do that, the default character bio is: movie 1, slightly soft character is tested to their limits, movie 2 is character toughens up, movie 3 character continues/finishes their personal quest etc...