Hey Frank! What do you think about Feanor?
He is a pretty fascinating character. Like, he can see the world ending and he chooses to make it worse. That's great. But he is also really stubborn and really prideful, and so he chooses to destroy his own work rather than accept it being used by someone else. (That's why he hates the Fëanorians so much; it's all the work that was his pride and joy, and he couldn't even let them have it.) This makes him even more interesting, because now we can see him wrestling with the idea that "this is my life's work, and I made it out of my own heart" and "the world has already been ruined so I should destroy what I've made instead of working hard to preserve it."
That said, he is the sort of character who would be really frustrating if he was in real life. There's no way you could have Feanor as the "main character" of a story -- it's much more fun to watch him as the villain, because then he has all the freedom to be frustrating. But in the world he's created, in which everyone he encounters is at least as big a dick as he is, he's also a completely irredeemable monster.
(This is really complicated because on the one hand he has this very powerful, and very interesting creation and on the other hand his whole world is collapsing around his ears and he can't let go of his pride. And even when his pride gets him killed, it doesn't seem like he learns that what he was doing was bad at all, because he just starts over from scratch, and everything is exactly the same from the beginning.)
