Haha, Zuko/Aang is not really my ship either (obviously, since I ship Aang/Katara). My favorite match for Zuko is Mai, but I could totally be talked into Zuko/Sokka (even though my favorite match for Sokka is Suki, and yukinoomoni writes that pairing and Zuko/Mai sooooooo deliciously). I think the fandom favorite slash pairing is Zuko/Jet, which seems an odd choice to me, but... well... the favorite het ship is Zuko/Katara, which also seems odd to me, so whatever I guess. XD

Um. Annabeth's entire dynamic with Rachel is that she's jealous of her, mainly over Percy. The only time she's not hostile towards Rachel is after that threat's been eliminated. And it's like with Percy/Luke - I don't get a good vibe from it. That could also be just because I have no interest in girllove, though. *shrug*

Having an alternate pairing usually changes indifference to dislike. XD Usually. Not always. For example, see my above Avatar pairings.