I watch Veronica Mars too---have since the beginning---the whole year the first year, sporatically the second though.
It got a little too dark for me last season so I mainly listened to the show eppy's I wanted to listen too and forgot the rest.
Me, my favorite characters are Weevil first. The reason is that this was a character that I disliked and then loved, in the first eppy. If he hadn't been there in the pilot, I would have just left the show behind---as weird as that sounds. There's just something about a guy who is dark and dangerous and yet has this ability to honor women and help V, whenever she needs it. And the verbal judo between the two---makes me want to cry and smile at the same time. : ) I love their friendship----just as much as I enjoy the snark and possible friendship between him and Logan. They say V can save Logan---I think that Weevil could be a big help too. : )
Second favorite turns out to be Lamb---just because of getting to know the actor better through online friends who have met him, talking to him over at a forum talk, etc. Michael is incredible. That and the character intrigues me too. You never know what to expect from him.
Okay----don't hate me and I have very personal reasons why I don't, but I really don't care for Logan. I like Jason (because of the extremes I'm heard from people who either like or dislike Logan, that makes him an incredible actor in my books) and I feel bad for Logan, but for very personal reasons (if you want to know them just send me a personal message on this site), well, more for you guys to love.
I do like his snarky attitude though---just not the character as a whole. And since I'm a non-shipper on teen shows (my muse is the shipper in fanfic and it's WeeVer and LoMac for her---so she must like Logan too as the snark mobile <g>)and would love them all to just be friends, I don't ship anybody with anybody on the show. It's just a quirk of mine---you still like me, right?