Probably Finn and BB-8. I like Finn's background (although it's a little weird that he shows zero remorse killing his former comrades, just like that), and BB-8 was nowhere as annoying as I thought it would be. In fact he's extremely cute.

+1 on BB-8. I thought it would be a forced R2-D2 imitation but he's his own personality and not annoying as you say.

I have to say Rey as my fave character, powerful and yet we don't know much about her for certain. I also think Kylo Ren is a great character, he's not the most evil and powerful villain , but his anger mixed regret/guilt makes him very confused.

Llewyn Davis

Tr-8r is probably my favorite in VII

Kylo Ren, it's good to see a conflicted villain that's prone to anger issues.

That and he's the perfect analogy for people who don't like the film and that everyone should hate it. Things don't go his way and he smashes everything ^^.

No idea of his name, I've only ever seen him in Inside Llewyn Davis, I spent a lot of the film thinking 'I know that guy from somewhere.'