I was drawn to them from the first episode. I somehow want to see more of their relationship (even if they're talking about each other to other people) and explore her resentment that he got so much attention and his feelings of inferiority that she was the successful sibling, all the while clearly loving each other (it was shown how protective they were of each other when they were in danger).
I would love a Nick so much, especially if he was in Alexandria and putting them at odds with each other. I think a lot of people see FtWD as the lesser sibling of the main show, which I think is really unfair. There are less characters I suppose, so there's less people to draw viewers in maybe. And with them being mostly related, it's hard for shippers.