Just something I had a sudden thought about. When Pietro was first introduced as a member of the Brotherhood of Evil Mutants, he was more or less a reluctant villain--you could see the groundwork being laid for his eventual reformation. During the "Cap's Kooky Quartet" days in Avengers he was more or less generic hero #5--perhaps he thought he should have been the leader at some point, but he wasn't particularly prickly and his attitude seemed to be in the right place.
So what happened? When did Pietro become the jerk we're all familiar with, and why did that characterization stick? Was it Green Arrow-itis? I'm well aware of his anger of Wanda's shooting in Avengers, but one would assume that once he got over that, his personality would return to something more...rational. Instead, he's just become more and more of a jerk over the years, to the point that if he did show up in a comic acting as he did during his first Avengers run, everyone would think he was a Skrull.
I'd say it was gradual. Wanda's shooting was a major step toward it, yes, but after that he was pretty much of a butt head when she announced her love of the Vision, too. That was another step. Then he became the man Crystal threw Johnny Storm over for. And so on.
I kind of blame John Byrne.
FF 240 had the most extreme 'drawn' face for Pietro and up until then Quicksilver's romance with Crystal was quite ....um...romantic.
I just wanted to say what a shame they did this to Pietro.
He really did have potential.
I fondly remember his early solo appearance in Amazing Spider Man #71.
One of my all-time favourite comics.