lol this is a tough question. あなた would probably have to cheat not to miss someone. So many people died in that book. Bathilda Bagshot, Mad Eye, Hedwig, Scrimgeour, Harry (technically), Snape, Dobby, and I think I'm missing a couple.
dobby and a bunch of death eaters that don't matter and a few miscellaneous students (i forget which ones now) that we hear of being mentioned all throughout the series.
Don't forget countless muggle bystanders and all those spiders near the end of the book. Man if they mounted machine gun turrets on each of the towers, defending Hogwarts would've been so much easier...