Below are the characters from J. K. Rowling's Wizarding World who have an appearance, mention, or otherwise tropable presence in Harry Potter and the Half-Blood Prince (the novel and its movie adaptation). Any tropes applicable to them will be written up on the pages below.
Characters in Harry Potter and the Half-Blood Prince (novel and movie):
- The Trio: Ron Bilius Weasley, Hermione Jean Granger
- Hogwarts Students:
- Gryffindor: Neville Longbottom, Dean Thomas, Seamus Finnigan, Parvati Patil, Lavender Brown, Katie Bell, Romilda Vane, Cormac McLaggen
- Slytherin: Draco Malfoy, Vincent Crabbe and Gregory Goyle, Pansy Parkinson, Blaise Zabini
- Ravenclaw: Luna Lovegood, Cho Chang, Marcus Belby
- Hufflepuff: Leanne
- Hogwarts Staff: Minerva McGonagall, Filius Flitwick, Rubeus Hagrid, Horace Slughorn, Argus Filch, Poppy Pomfrey
- The Weasley Family: Molly Weasley, Arthur Weasley, Percy Weasley, Fred and George Weasley, Ginny Weasley
- Order of the Phoenix Members: Nymphadora Tonks
- Marauders: Remus Lupin, Peter Pettigrew
- Death Eaters: Bellatrix Lestrange, Amycus and Alecto Carrow, Thorfinn Rowle, Fenrir Greyback, Narcissa Malfoy
- Muggles: Mrs. Cole
- Animals and Pets: Hedwig, Mrs. Norris, Fawkes, Crookshanks, Pigwidgeon, Fang, Aragog, Arnold
Novel only characters:
- Hogwarts Students:
- Gryffindor: Colin Creevey, Dennis Creevey
- Slytherin: Theodore Nott
- Ravenclaw: Marietta Edgecombe, Terry Boot, Michael Corner
- Hufflepuff: Ernie Macmillan, Zacharias Smith, Hannah Abbott, Susan Bones
- Hogwarts Staff: Pomona Sprout, Sybill Trelawney, Rolanda Hooch, Irma Pince
- The Weasley Family: Bill Weasley, Percy Weasley
- Ministry of Magic: Dolores Umbridge, Cornelius Fudge, Rufus Scrimgeour, Bob Ogden
- Order of the Phoenix Members: Alastor Moody, Fleur Delacour, Kingsley Shacklebolt, Aberforth Dumbledore, Olympe Maxime, Mundungus Fletcher, Arabella Figg
- Death Eaters: Yaxley
- Muggles: Vernon Dursley, Petunia Dursley, Dudley Dursley, Tom Riddle Sr, The Prime Minister
- Other Characters: Marvolo Gaunt, Morfin Gaunt, Merope Gaunt, Madame Rosmerta, Hepzibah Smith, Rita Skeeter, Ernie Prang
- Magical Beings: Firenze, Nearly Headless Nick, Moaning Myrtle, Peeves, Dobby, Kreacher, Hokey, Grawp
- Animals and Pets: Buckbeak, Trevor
Movie only characters:
- Hogwarts Students:
- Gryffindor: Nigel Wolpert
- Slytherin: Flora and Hestia Carrow
- Ravenclaw: Padma Patil
- Order of the Phoenix Members: Lily Potter
- Death Eaters: Regulus Black