My son (now 7) and I are on book four, and there's a lot of new characters that needed to be introduced for The Boy Who Retains Pictures But Not Names. XDPlease stop asking about characters that are not in the first four books... it *says* "up to Goblet of Fire".
We haven't got further yet.
A few are missing; usually because he never forgets who they are. Mainly Crabbe and Goyle.
Harry, Hermione, Ron, Dumbledore;
Neville, Dean Thomas, Seamus Finnigan, Malfoy;
Fred and George, Percy, Oliver Wood, Snape, Quirrell;
Nearly Headless Nick, Lee Jordan, Parvati Patil, McGonagall, Hagrid;
Colin Creevey, Lavender Brown, Sir Cadogan;
Mrs and Mr Weasley, Peeves, Cho Chang, Moaning Myrtle, the Fat Lady;
Gilderoy Lockhart, Fawkes, Lucius Malfoy, Dobby, Justin Finch-Fletchley;
Professor Sprout, Professor Flitwick, Ernie Macmillan, Hannah Abbot;
Madam Pomfrey, Mr Filch and Mrs Norris, Cornelius Fudge, Cedric Diggory, Madam Rosmerta;
Madam Hooch, Professor Trelawney;
Sirius Black, Remus Lupin;
Peter Pettigrew/Scabbers; Voldemort;
Ludo Bagman, Mad-Eye Moody;
Mr Crouch, Fleur Delacour, Victor Krum;
Madame Maxime, Professor Karkaroff.
Pencil, Texture by me.