| Character | Description |
| Alecto | Death Eater; sister of Amycus |
| Amycus | Death Eater; brother of Alecto |
| Aubrey, Bertram | Hexed by James Potter and Sirius Black while at Hogwarts |
| Belby, Marcus | Member of 'Slug Club' |
| Belby, Damocles | Inventor of Wolfsbane Potion; Marcus Belby's uncle |
| Benson, Amy | At orphanage with Tom Riddle |
| Bishop, Dennis | At orphanage with Tom Riddle |
| Bobbin, Melinda | Family owns a large apothecary chain |
| Burke, Caractacus | One of the founders of Borgin and Burke's |
| Cadwallader, ? | Hufflepuff Quiddich player |
| Carrows, ? | Death Eaters |
| Cecilia | Friend of Tom Riddle Sr. |
| Chorley, Herbert | Junior Minister under Prime Minister - victim of poorly performed Imperious Curse |
| Cole, Mrs. | Ran the orphanage where Tom Riddle grew up |
| Coote, Ritchie | Gryffindor's Quiddich team Beater |
| Cresswell, Dirk | Head of Goblin Liaison Office; former student of Horace Slughorn |
| Cuffe, Barnabas | Editor of the Daily Prophet; former student of Horace Slughorn |
| Flume, Ambrosius | Owner of Honeyduke's; former student of Horace Slughorn |
| Gaunt, Marvolo | Tom Riddle's grandfather |
| Gaunt, Merope | Tom Riddle's mother |
| Gaunt, Morfin | Tom Riddle's uncle |
| Gibbon, ? | Death Eater |
| Greyback, Fenrir | Werewolf (and NOT very nice) |
| Harkiss, Ciceron | Gave Ambrosius Flume his first job at Slughorn's recommendation |
| Harper, ? | Slytherin Quiddich team Seeker |
| Higgs, Bertie | Hunted Nogtails in Norfolk with Cormac McLaggen, his Uncle Tiberius, and Rufus Scrimgeour |
| Hokey | House-elf to Hepzibah Smith |
| Jones, Gwenog | Captain of the Holyhead Harpies; former student of Horace Slughorn |
| Leanne | Katie Bell's friend |
| Malfoy, Abraxas | Draco Malfoy's grandfather |
| McLaggen, Cormac | Member of Slug Club, fills in as Gryffindor Keeper |
| Merrythought, Galatea | Former DADA teacher |
| Muriel, Great Auntie | Weasley relative |
| Ogden, Bob | Worked for the Department of Magical Law Enforcement |
| Peakes, Jimmy | Gryffindor Quiddich team Beater |
| Prince, Eileen | Severus Snape's mother |
| Robards, Gawain | Replaced Rufus Scrimgeour as Head of the Auror Office |
| Robins, Demelza | Gryffindor Quiddich team Chaser |
| Sanguini | Vampire |
| Scrimgeour, Rufus | New Minister of Magic |
| Slughorn, Horace | New teacher at Hogwarts |
Smith, Hepzibah | A very old, very rich witch, deceased |
Snape, Tobias | Severus Snape's father |
Stubbs, Billy | At orphanage with Tom Riddle |
| Twycross, Wilkie | Ministry Apparition instructor |
| Urquhart, ? | Slytherin Quiddich team captain |
| Vaisey, ? | Slytherin Quiddich team Chaser |
| Vane, Romilda | Fourth year Gryffindor; has a persistent interest in Harry |
| Verity | Fred and George Weasley's shop assistant |
Worple, Eldred | Author of 'Blood Brothers: My Life Amongst the Vampires' | | Yaxley, ? | Death Eater |
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