Harry and his allies will destroy the Death Eaters first and Peter Pettigrew will witness Voldemort's destruction but Snape will be the very last villain to fall, and Draco Malfoy will help Harry conquer him.
Neville will save Harry's life during the battles with the Death Eaters
Arthur Weasley will become the new Minister of Magic
Harry & Ginny
Ron & Hermione
Neville & Luna