I always wish Betazoids were explored more in TNG. I think it was a missed opportunity. They didn't really do much with them besides make them have kinky nudist weddings. It didn't help that the only other betazoid we regularly saw was Crazy old Lwaxana. Then we see Devonani Ral and he's a total doucher. Oh, and the unstable effeminate betazoid from Tin Man. He was kind of annoying and most of the characters disliked him. I don't remember any others with any significant parts.