Well in Oblivion, a female bosmer was married to a male nord pirate, in Anvil. However, she was having an "affair" with the local smith's apprentice, who is, IIRC, a Bosmer.
No, it was the nord husband who was having the affair. You find the evidence in the quest where you go after the bandits who try to seduce married men.
We have Syl and Thadon.
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Definitely not. One is a pleasure fiend, the other is more paranoid than...well I can't think of something right now, but pretty damn paranoid.
Arch-mage traven was a bosmer. But really, they're meant to be quirky and odd, like a curious forest animal.
Archmage Traven was a breton