The bloodline began with Lord Harkon after he pledged himself to the Daedric Prince Molag Bal, and in his name he sacrificed a thousand innocents. In return, Molag Bal granted him immortality by turning him and his family into pure-blood vampires. They went on to become the progenitors of the clan.
- While it is never directly stated, Harkon is essentially the Head Vampire.
- Once Lord Harkon is defeated the player (if a Vampire Lord) should be considered the new Dark Lord of the Vampires. If the Dragonborn is not a vampire, the title should transfer to Valerica if it ever belonged to Harkon.
- Harkon and his family are technically royalty, even if the kingdom in which they reign is no more.
- Vingalmo and Orthjolf are Harkon's advisors and the highest ranking members of the court outside of the royal family.
- Feran Sadri - The castle's resident alchemist and quest giver.
- Fura Bloodmouth - A vampire warrior and Two-Handed master trainer.
- CuSith - A Death Hound pet and potential follower.
- Garan Marethi - Senior member of Harkon's court and quest giver.
- Garmr - A Death Hound pet and potential follower.
- Hestla - Resident castle blacksmith and arms merchant. Former member of the Companions.
- Harkon - Ancient pure-blood vampire and lord of the castle.
- Lokil - Encountered inside Dimhollow Crypt, killed by the Dragonborn.
- Modhna - Low ranking member of Harkon's court.
- Namasur - Low ranking member of Harkon's court.
- Orthjolf - Senior member of Harkon's court vying for the throne. Rival of Vingalmo.
- Rargal Thrallmaster - Overseer of the vampire thralls and cattle kept in the castle dungeon.
- Ronthil - Apprentice to Feran Sadri, General goods merchant and Adept Speech trainer.
- Salonia Caelia - Low ranking member of Harkon's court. Lacky to Vingalmo.
- Serana - Estranged daughter of Harkon and Valerica.
- Stalf - Low ranking member of Harkon's court. Lacky to Orthjolf.
- Valerica - Mother of Serana and wife of Harkon.
- Vingalmo - Senior member of Harkon's court vying for the throne. Rival of Orthjolf.
- Watchman - Gatekeeper of Castle Volkihar.
- The Elder Scrolls IV: Oblivion (Mentioned only) 
- The Elder Scrolls V: Skyrim (Mentioned only) 
|Feran Sadri • Fura Bloodmouth • Garan Marethi • Harkon • Orthjolf • Serana • Valerica • Vingalmo|
|CuSith • Garmr • Hestla • Lokil • Modhna • Namasur • Rargal Thrallmaster • Ronthil • Salonia Caelia • Stalf|
|Castle Volkihar • Factions (Skyrim) • Volkihar Clan (Lore)|