Voldemort Daughter Novels & Stories

Oh, this is such a fascinating topic! In the original 'Harry Potter' books, Sirius Black doesn't have a daughter—at least, not one that’s ever mentioned or confirmed by J.K. Rowling. The Black family tree is pretty elaborate, with characters like Bellatrix, Narcissa, and Andromeda getting a lot of attention, but Sirius’s line ends with him. Some fans have speculated about potential secret children or expanded universe possibilities, but canonically, it’s a dead end.

That said, fanfiction has run wild with the idea. I’ve stumbled across dozens of stories where Sirius has a hidden daughter, often set during or after the main series. It’s a fun trope, especially when writers explore how she’d interact with Harry or the rest of the Black family. But if we’re sticking to the books, nope—no daughter exists. It’s one of those gaps that leaves room for imagination, though!

The mystery surrounding Sirius Black's daughter is one of those tantalizing gaps in the 'Harry Potter' universe that fans love to theorize about. J.K. Rowling never officially introduced a daughter for Sirius in the books or supplemental material, which leaves her existence purely speculative. Some fanfics and headcanons explore the idea—often painting her as a hidden heir raised in secrecy due to the Black family's dark reputation or the dangers of the First Wizarding War. I've stumbled across theories where she’s a Metamorphmagus like Tonks or even an unsuspecting Muggle-born, adding layers of irony to the Black lineage.

Personally, I adore the idea of her being a defiant, free-spirited character who mirrors Sirius’s rebelliousness but carves her own path—maybe even crossing wands with the Death Eaters during the Battle of Hogwarts. It’s fun to imagine how she’d interact with Harry, too: a cousin who shares his penchant for breaking rules but with the Black flair for drama. Until Rowling confirms anything, though, she remains a ghost in the fandom’s imagination—a blank canvas for creative stories.

I stumbled onto a pretty good one just last week, honestly surprised by how well the author handled it. It was on Archive of Our Own, tagged 'Hermione Granger & Tom Riddle Voldemort' and 'Alternate Universe - Parentage'. The premise sounds wild, but the writer built it around Hermione finding a hidden pensieve memory in the Hogwarts library during her fourth year. It creates this tense dynamic where she's trying to hide her heritage while excelling in classes Voldemort once aced.

Sometimes those extreme 'what if' plots work because the characters have to navigate the existing world rules. This fic had her brewing Polyjuice potion not to sneak into the Slytherin common room, but to secretly visit the Chamber of Secrets. The setting stays firmly at Hogwarts, but it changes the meaning of every portrait and secret passage.

Found it by filtering for 'Hogwarts Era' and sorting by kudos from the past year. You'll have to wade through some crackfics that are just for shock value, but the serious takes are out there.