Head canon: Caitlin Trevelyan of Ostwick Circle and Cullen. (I was going to go with Maeve to reference the old Irish legend, but as it's my daughter's name I suddenly was thinking... maybe not)
I do like the touches with a mage character. Though I would have also liked to have seen a little extra with any player who goes through the Envy Demon, since it is something they have in common
I also know some people have called Cullen's romance Alistair 2.0, but while there are some surface similarities (former templars, physical appearance, a little uhm... uncertain about romantic relationships). Cullen's a great deal more hard edged in some ways. His sense of humor is also VERY different, and he has to be reminded about doing things like er having a life outside being Commander Cullen. It's one of the reasons I not only love the chess sequence, but the Wicked Grace game too. Especially since he complains about it at first and then gets a little too into it (I want to know that story thought. heck I want to know the Inquisitor's story!) I also would have sold my cat to Bioware if they'd added some romance lines for the characters in that.
Heck, I just want more scenes like that in general... Wait, this was about romances right? Yes, this was being silly for a moment.
But seriously, what got me was the post Arbor Wilds scene for Cullen