There are all kinds of relationships between major and minor characters, and those are of all stages of development.
So I would divide it into:
Speculative Romantic Relationships (things we haven’t seen in the show but fans would like to see) and
Confirmed Romantic Relationships of Major or Minor Characters That are Curse Breakingly True
Snowing, Rumbelle, SleepingPhil …zzz, sorry, (yawn)….Lost my train of thought. Anyway, of those, I prefer Snowing as they are at a “mature” state of their relationship–the day to day life together in a committed relationship with daily woes like, how to sneak in some “us” time before the family gets in. Tacos anyone? Yet it still has the fancifulness of fairy tale romance to make it sweeter than the average depiction on say, a comedy show. I feel like Rumbelle still has a few things to work through. SleepingPhil….I’m too tired to talk about them.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass