Ro Laren is in all of the Relaunch books. (All where there is action on the station, that is.) She has taken Odo's place as Security Chief, and joined the Militia. And I like how she starts off initially antagonistic with Kira and then comes to a degree of grudging respect.
Ro is a very interesting character, and I think that DS9 would have worked with her as a regular. However, I think that having Kira there instead creates a more interesting dynamic -- as she is fiercely patriotic, former terrorist, and also not in Starfleet, which gives her an outside perspective that would not have been quite possible with Ro Laren.
When in doubt, hug your teddy.