The thing about Relena, in my opinion, is that she's a very controlled person, and those sort of people are often quite driven and passionate underneath the immediate surface, and that mix of self-restraint and intense emotion would probably make for a very good pilot -- heck, just look at Heero. And that's as opposed to, say, Trowa, who always struck me as a lot more genuinely dissociated from what's going on around him.

*grins* For Treize, I'd imagine that sex I nearly typed "Zechs"... ack and romance are just part of the whole bag of interaction with other people, AND he really likes winding the people around him up (they're more useful that way!). And confusing people. And... yeah. Looks like I'm not going anywhere in particular with this *sheepish smile*