Hogwarts twenty years on:
Hermione is Headmistress, deemed to be smartest and most admirable head since Dumbledore.
Harry is Defence against Dark Arts teacher, legendary defeater of Durmstrang in the annual "Remus Lupin Boggart Blasting Medal".
Ginny, Harry's wife, is Deputy Head (girrl power) and Transfiguration teacher, where she regularly entertains her class by turning into a fire salamander (small & red).
Ron is Care of Magical Creatures teacher, where he has finally cured himself of his fear of spiders by having Aragog's great grandson as a pet (named Wang).
Krum is the Quidditch teacher. He and Ron compete fervently for Hermione's attention, keeping the whole school amused.
Neville is Herbology teacher, where he grows beautiful flowers to present to his wife, Luna, the Divination teacher.
Moaning Myrtle is the librarian. (Well, if Terry Pratchett can have a orangutan, I can have a ghost).
And Draco? shamed by his family's exposure as supporters of Voldemort, the only post he can secure is that of janitor, where he and his two rats (with pudding bowl haircuts and surprisingly long tails) are the most reviled and taunted since Argus Filch.