|Gaspar Cornelius Avery|
- "Mulciber and Avery's idea of humour is just evil. Evil, Sev. I don't understand how you can be friends with them."
- —Lily Evans to Severus Snape.
Gaspar Cornelius Avery was a wizard, son of Clarence Avery, half-brother of Gaston Avery and a Slytherin student at Hogwarts School of Witchcraft and Wizardry. After graduating from Hogwarts, he became a Death Eater. He fought in several battles during the First Wizarding War. Avery didn't search for Lord Voldemort after his downfall, but this was forgiven, after his master's return. During the Second Wizarding War, Avery fought at the Battle of the Department of Mysteries with a group of Death Eaters, attempting to take a prophecy from Harry Potter. After the battle, he was imprisoned in Azkaban, but escaped in 1997.He fought during the Battle of Hogwarts and years later he was imprisoned in Azkaban again.