If the mc of a novel died at the end, how would you feel? I feel as if I have done all I can with my character and feel the right ending would cause her to be killed sacrificing herself to save her brother (her trying to find/rescue her brother is the ploy of the story). This act of selflessness would fit her personality, but I am worried readers of the story would be angry that she was killed off. Thoughts?
It depends. I personally hate endings where the protagonist dies...because it's like: "I read/watched this why??" Others are different though.
Its up to you. If you think that that would wrap up the story well, go for it. But, you have to make sure that it is plain to everyone that that was the only possible solution, that you didn't just kill her off for shock value, but that her death at the end means something, had value. If there was a way for her ti survive and have the same outcome, people will see through that and her death will lose value.
I agree wholeheartedly! If you kill your character, I want you to make me cry! (Or at least be very sad for several hours)
Sometimes it's inevitable; the way you molded this character and his/her trajectory, the story cannot do without such a death.
If the MC has accomplished something meaningful, has gained some significant insights about themselves that make them "complete" as human beings, or perhaps has learned to connect in ways they couldn't before--in other words, if they have fulfilled the journey of their character arc, then, sure, they can die, and it can still be a very satisfying reading experience.