In answer to the question...
What five character deaths affected you the most?
1) Bart Allen (aka Impulse/Kid Flash/The Flash): Honestly, I don't care all that much about the speedsters, but this is Bart. Bart who was way cute in Young Justice (and in his own title), who was painfully eager to please in Teen Titans, and who--as The Flash--liked to run fast and help people. I was heartbroken that they killed him. So much so, that I considered buying Countdown 42--despite the dreadful art--so that I could have the issue that showed his funeral. And I don't care that they brought Wally back. I liked Bart better.
2) Jean Grey (aka Marvel Girl/Phoenix): The most recent death--the one in 2005. I was so affected, in fact, that I stopped buying X-Men comics once I realized that they weren't bringing her back right away. She was my favorite character, and when they got rid of her (and put Cyclops with EMMA FROST, of all people), I lost my interest in the series.
3) Angel Dumott Schunard: The "heart" of the Rent family. No matter how many times I see Rent, I always cry when Angel dies. It's pathetic. I start crying during "Without You" and I don't really stop until after the finale. With the minor exception of "What You Own," but who can cry during an inspirational song like that?
4) Cedric Diggory: The first Harry Potter death. I was shocked that J. K. Rowling had killed this fairly benign, charming character. These were kids' books, for cryin' out loud! I thought the bad guy was supposed to be the one that kicked it.
I'm totally cheating here, but...
5) Remus Lupin and Nymphadora Tonks Lupin: For oh, so many reasons. Remus because he was one of my two very favorite characters (can you guess which the other one was?). I always half-suspected that he might not come out on the other side of book seven--none of the other Marauders did, after all, but I loved him so that I continued to hope anyway. Because he was one of my two very favorite characters, and he has had so much misery in his life, that I hoped he would get a chance to not be miserable.
Tonks, because she was one of my two very favorite characters, ;-) and I loved her. She was probably one of the characters I identified with the most in the seven books. She was clumsy, good-natured, and clever (obviously, or she wouldn't have made it to be an auror). I saw myself in her a bit, and it was terribly sad to see my "avatar" in the books die.
And GUH. My sense of fair play was offended by these deaths. They had just gotten married and had a baby, and then they died. It sucked. Which, I suppose, was part of the point in killing them, but No. Frigging. Fair. ::glomps Teddy Lupin, hides him, and prepares to write lots of AU where one or both of his parents do not die::