I used to be able to mimic, at least reasonably well, Seven's voice. I haven't tried it in ages and ages, and I wonder if I could still do it. As for Voyager favorites, I always liked Chakotay, and Kes when she was in competent, empathetic nurse mode rather than little girl mode. And Tuvock had interpersonal skills that someone like Spock did not, no matter what Tuvock (and Neelix) say about it. :P And he could sing!