My top favorites list (1 Being most favorite, 7 being least):
1. Serana (I'm strongly in love with her, I've even sworn my love to her, in other words, I'll avoid love with anyone else, across ANY game. I don't just like her for her looks either)
2. Ogmund (He's a cool guy, and I like his singing. I'd put Belrand here, but the backstabbing piece of s*** started attacking Serana during one of our adventures, so he's now my sworn enemy)
3. M'aiq the Liar (Who doesn't like this guy? He has some pretty funny dialogue)
4. Ulfric Stormcloak (I'm a loyal Stormcloak supporter, and his voice is badass)
5. Ralof (He's kind of like an old friend to me, plus we escaped Helgen together)
6. The Guards (I love alot of their dialogue. "Let me guess, someone stole your sweetroll")
7. Sven (He's kinda cool to me, plus he's a rather easy follower to get, just gotta gear him up a bit)
After proof reading, I just noticed everyone in my list is a Nord, aside from M'aiq and some of the guards maybe.