I'll talk about my characters a bit while the thread is young, before chiming in on the others. These are two characters I'm playing in the same campaign right now.
Kendov, dragonborn bard/steampunk engineer. It's set in the Dragonmech world, basically what would happen if you took a painfully generic D&D setting and then hit it with enough meteors that it looked like someone nuked the whole planet. Gestalt rules so he has two classes, bard and coglayer.
His egg was found in a ruined shelter by a group of exiles who were moving underground to build a new society, finding a habitable cave and building a self sufficient society there. They wanted to escape the hardships and pain of the surface world, and so developed a very hedonistic society.
Both in the common form, and in the old moral theory of Hedonism, meaning that what feels good, and brings comfort and joy, is good, morally. Very free love, few taboos and generally a very open society. Work hard, play harder, the world is only as grim and painful as we allow it to be.
Kendov is a true son of that world, he has few taboos and little understanding of surface world social norms. He explores because he thinks hiding your head in the sand isn't a good long term strategy and he wants to see if there are any dangers up there. Also to learn and take that learning home with him.
He's very open and forward with his wants and desires, makes friends quickly, is extremely naive about politics or complex motivations and just wishes everyone would just stop fighting and get along.
While he's a very casually lewd individual, he's hardly lecherous. In fact the strongest emotional lowpoint for him was when, while drunk, he made some rather suggestive comments to a pretty woman who was helping him stagger home, after sobering up and realizing how he'd offended her he spent the rest of the day in a depressed funk, lamenting how little he knew about what was right or wrong to say and do in this strange culture.