Teachers and Staff:
Argus Filch
Filius Flitwick (Charms)
Dolores Umbridge (Defense Against the Dark Arts)
Minerva McGonagall (Transfiguration)
Charity Burbage (Muggle Studies)
Cuthbert Binns (History of Magic)
Firenz (Divination after Trelawney was fired by Umbridge)
Wilhelmina Grubbly-Plank (Care Of Magical Creatures when Hagrid is away)
Rubeus Hagrid (Care of Magical Creatures)
Rolanda Hooch (Flying)
Aurora Sinistra (Astronomy)
Severus Snape (Potions)
Pomona Sprout (Herbology)
Sybill Trelawney (Divination)
Hogwarts Ghosts:
The Bloody Baron (Slytherin)
The Fat Friar (Hufflepuff)
The Grey Lady (Ravenclaw)
Sir Nicholas/Nearly Headless Nick (Gryffindor)
Members of the Order of the Phoenix:
Alastor Moody
Kingsley Shacklebolt
Arthur Weasley
Fleur Delacour
Molly Weasley
Mundungus Fletcher
Nymphadora Tonks
Remus Lupin
Sirius Black
Death Eaters:
Alecto Carrow
Amycus Carrow
Barty Crouch Jr
Antonin Dolohov
Fenrir Greyback
Igor Karakroff
Bellatrix Lestrange
Lucius Malfoy
Peter Pettigrew
Yaxley
Lord Voldermort