Will never happen, but what if the Guardian is Merlin? Or if Merlin makes a special appearance when Rumple lays the Dark One to rest once and for all?
Anon, don’t make me weep for my sweet Merlin. He was a delight and I wanted way more of him.
Also, I could totally see Merlin being like, “Rumplestiltskin, I met your incredible, gorgeous, and brilliant wife Belle once. She was bad ass and underappreciated, but it’s all good. We’re having amazing times in the afterlife with your son, Baelfire, and we’re just waiting on you to join us. Let’s kick some Dark One ass for good, friend.”