Bringing back Hicks would be weird and pointless - what was there to the character anyway? But even bringing back Ripley would destroy it for me. She was a survivor by chance, ever more convoluted ways of involving her in each sequel was stretching credibility.
Amanda Ripley maybe. Make a film inspired by Isolation. Something that recaptures the essence of the original. And get the look of the alien right, if it's an alien film it's Giger's alien you want.
No Queen alien either, let's not go down that route again. In fact, for me, if it's anything in the Aliens mould I would find it a deeply depressing. regressive watch. Colonial marines - no thanks.