I am definitely a fan of the grandma Regina and great grandpa Rumpel that could be there. They would actually have to use it though and actually have the characters talk about their past and not just have it be about the new big bad.
I am also very curious about what these characters will look like. I guess we can assume that Rumple will look the same, being immortal and having not changed over the past 300 years. Hook will age to about 50. But Regina though? Glamour spell or grey hair and whiskers? haha.
As for what the writers will do with the characters…maybe they will appear in flashbacks only, because their past actions affected Lucy and Henry’s current situation? Certainly this would keep the characters looking young.
Keeper of Regina's bravery