Any favorite characters you think should have been used more?

For me, it's Mikael the Bard. And Idgrod Ravencrone. In Mikael's case, he could have brought a lot more humor to the game, with his pimpish ways. Idgrod just has a cool attitude.. seems like she'd be a wise mentor type. Especially with her visions, which you never get to hear much about. Outside Morcarth, I don't get to do much with her except have her cause some antics at a Thalmor party.

Sapphire.

Ah yeah, her too.

Also, add her to the list of "Damn, Bethesda, why can't I marry her?"

Anyone available for marriage. Think about it; once they marry you, NPC's like Aela, Ysolda, Muiri and others all become rather one-dimensional. They don't talk about their days, their dreams, having a family, etc. There was a great chance here to expand upon a select few NPC's, but alas.

Seconded, I bet she's a tiger in the sack. What with her back story an' all.