Snowbarry. When I first watched The Flash, I thought 'aww, Barry and Caitlin are so good together.' As I watched on and drug my family to watch with me, they all thought the same thing. But as the series continued, we never got to see them move forward in their relationship. He and iris did. Only, that didn't happen until season three and they moved pretty fast in that. (pun intended)
I can still see snowbarry as a possibility in another earth, but for now, I doubt the writers will condone it. But that won't stop us from dreaming and writing letters to the producers about it! Who's with me?!