Heero/Duo. I got into Gundam Wing when I was thirteen, and that ship got me into some really bad habits that were absolutely endemic in the shipdom, like ukeification (Duo's number came second! He had long hair! Must be the bottom!) and bashing female 'rivals'. Twenty-six-year-old me kind of wants to slap thirteen-year-old me, then go find Relena and apologise...

I'm not in GW fandom any more, but I still have a lingering fondness for the ship (when done right) and still have a bunch of art saved for it. (And I want to rewatch it as an adult, since I suspect I'll actually really like Relena now.) Just. The fans....