It is repeatedly stated that in Harry's world once you're dead you stay dead (with the exceptions of returning as a ghost or to in habit a magical painting).

Harry, Ginny, MacGonnigle, Malfoy, Mr Weasley, and Voldemort will all die with Longbottom as the ultimate hero. Snape will become headmaster of Hogwarts. Bill will marry Tonks, Ron and Hermione will get off with each other.