It's going to be Ron. I know it. We love him,
I love him, I've told this theory to everyone who'll listen: Ron is going to die in Book 7. I want to believe it's not true, but just think.... who else could it possibly be? In the last two books Sirius and Dumbledore have died, both characters very close to Harry. So obviously someone else close to him is going to have to die in the next book - if no one does, that'll be too cliched-happy-ending for such an increasingly dark series. And it's going to be Ron! Every other character that could potentially die is a pity case, or a heroic girl, or a character that's not insignificant enough to be redshirt-ed, nor significant enough to truly overturn the book like Sirius' and Dumbledore's deaths did.
Hermione: she's the girl, she's the brains behind everything Ron and Harry ever do. If JK Rowling kills Hermione, she's not just killing a character, she's killing a stereotype: smart female sidekick. And Hermione is a muggle. By making her so brilliant, JK Rowling's also making a statement about the prejudice against muggles in the wizarding world, and if Hermione dies that statement is undermined, which makes it unimportant that Harry and Voldemort are both half-blood. So as annoying as Hermione can sometimes be, she's off limits.
Neville: he's too bumbling, too cute, too lovable to just kill off. And look at what happened to his parents! After their tragedy, it would be too cruel to kill off Neville, too. Plus, though on the surface it seems he can't do anything right, he tries so hard, and now and again does something right really well. JK Rowling simply cannot kill off someone who's so bungling, because that's like sending a lamb to the slaughter (no offense, Neville!).
And who else is there? Luna is in the same boat as Neville, McGonagall isn't close enough to Harry, neither are the Weasley twins... actually, now that I think about that... no, they can't die! If one of them dies, the other one will die too. That would be too cruel. Then there's Ginny, but I don't think she'll die. She's so young, she'll only be 16 in the next book; and Harry's already broken up with her, anyway, being the martyr that he his, so she won't be in quite as vulnerable position.
No, it's going to be the person closest to him, the one that he relies on the most. Ron has already shown that he's willing to die for Harry by always going with him into danger.... do you remember when he played the chess game in the first book?!? That was willingness to sacrifice himself for Harry. And now at the end of The Half-Blood Prince he's determined to go with Harry in Book 7 to fight Voldemort. But Harry has to face Voldemort alone - every time he's faced Voldemort so far he's done by himself. If Ron is with him, he'll get eliminated like Cedric did, if he hasn't already been killed earlier in the book.
And of course we can't forget the Christmas Feast in The Prisoner of Azkaban, when there are 13 people at the table, and Trelawney prophesies that the first to rise will be the first to die - Harry and Ron get up at the same time. Obviously it's supposed to look like another one of her death prophesies for Harry, but what if.... what if she's right? Ron's going to die!
But kudos to Rowling, even if she kills Ron. I was watching The Goblet of Fire, and in the battle scene between Harry and Voldemort when their wands connect I remembered how vividly she describes it in the book - I have a better visual from the book than from the movie, honestly. But I was thinking about that and realizing that she's genius. She's created such a complete world, where absolutely everything is explained, and she mentions even the most insignificant things just to give further credibility to this world. Where does that level of pure imaginative, detailed fantasy come from?
I'm so hopelessly addicted to the Harry Potter series. I got HBP at the midnight release at Vroman's (incidentally, that was the same evening that Charlie and the Chocolate Factory came out..... basically the best night of my life). It's just that the obsession doesn't really manifest itself till summer, when I at long last have the time to settle down with the series (how many times have I read it now?), read the numerous theories online claiming that Dumbledore isn't really dead or that he asked Snape to kill him, and to come up with my own dire predictions for Book 7.