Ezri II
Captain
They would seem to be very unlikely friends, other than the Dax connection. Kira and Jadzia were strong, kick-ass friends, joking about men etc.. Ezri was, IMHO, way too girly to really be friends with Kira.
They were joking about men?
They were at war, Kira was very busy, the friendship would not have have been an instant one.. so I don't think either would have pursued it at that point. Now in a different, more peaceful time perhaps a friendship would have developed.
Never thought I would see the words Kira and busy in the same sentence.