https://screenrant.com/the-conners-season-6-roseanne-characters-return/

From minor characters who popped up in season 5 to major players like DJ and Bev, The Conners season 6 could bring back many Roseanne heroes.

Bev has been really a pain, it would be a disservice to Estelle Prasons to be brought back just to be hated. And her storyline had closed earlier than season 5.
DJ should definetely come back, and also Mary and Geena. But you'd need good writers.

Apart Chuck, I'd wish to see again from the earliest seasons Crystal and Nancy. They'd bring back memories and the right mood.