Rose Of Sharon Cassidy for me. Her skin is so pale, and then she blushes.... :blush: Oh, my.
Plus she is a smart@ss, and shoots well.
And on this excellent topic, I was so hoping for some mention in the ending slide show about how, "the Courier stayed in touch with (X), and though they argued sometimes, on the whole they had a pretty good time."
--where (X) is the companion you spent the most time with, or it could even be (XYZ) for several followers.
Maybe not specifically described romance, but it could be taken that way. At least some mention of life after the game where the Courier doesn't just fade into the sunset.