I was watching an episode of Kekkaishi, which I don't really watch but occasionally, and they killed off this one monster chick right when she was almost about to be a 'good guy,' and/or return to the human that it took her like 50 years to realize she was in love with. I don't really know her full backstory, but it's stuff like that I can't stand. Oh! Nephlite from Sailor Moon, um...Wizardmon from Digimon doesn't really count since he was a double agent, but that one REALLY fucking pissed me off at the time.

Ha, I guess it really pisses me off when there's an unrequited love story attached to it.

I can't keep track of all the manga I've read since some series I'm forgetting about are still in tubs in the garage, but I'm sure I've come across it *somewhere.*