Regarding least favorite characters, here are some thoughts from me.
* I like Janeway a lot, both her soft side and her tough as nails side. Sometimes I wish she'd used her soft side when she used the tough side, and vice versa...
* Chakotay is pretty forgettable, but I enjoy it when he and Janeway are in a room together, especially early in the series when they let their chemistry show a little more.
* Tuvok is awesome. He's all Vulcan, but every now and then you see the man behind the ironclad discipline. Hard to believe Tim Russ was actually a comic "we ain't found

" actor...
* Neelix is kind of like your bubbly cruise director, but Ethan Phillips pulls it off.
* Tom Paris's cockiness is nicely set off by his sensitivity.
* How Harry was handled was a travesty, but the character was essentially likable, and shined every now and then.
* While the EMH was well played, I was never totally onboard with the whole "sentient hologram" idea. I mean, Data feeling emotions is supposed to be a big deal... until you see that the computer on any starship can carry a being with more emotional capacity than Data, no problem.
* I was deeply ambivalent about B'Elanna, largely because I felt she shouldn't have been promoted as quickly as she was. Opposite problem as Harry, but the result was the same: two characters denied the ability to grow. Ironically, my favorite Roxann Dawson role is that creepy space station in "Dead Stop".
* Kes was just likable. It's easy to see why both Neelix and Tom had a thing for her.
* Seven was a great character despite her ludicrous costume... I don't condone that they focused on her so much, but I see why they did.