Delphini

Delphi Diggory is the daughter of Bellatrix Lestrange and Lord Voldemort (Tom Riddle). She is a character in Harry Potter and the Cursed Child. Through the work of dark magic, she poses as Amos Diggory's cousin. She is played by Esther Smith.

Early Life
Delphi was raised by the Thorne's, notorious Death Eaters. She is the child of Voldemort and Bellatrix Lestrange.

Story Line
Delphi confunds Amos Diggory and everyone else into thinking that she is Amos' niece and a nurse at his nursing home.

She meets Albus when Amos comes to the Potter household to ask Harry if he can use the time turner to go back in time to save his son Cedric. Albus was eavesdropping at the door. Delphi and Albus chat for a while.

When Albus and Scorpius escape the Hogwarts Express in the intent on saving Cedric, she meets them at the Nursing home. She convinces Amos to let them help in saving Cedric. When Albus, Scorpius and Delphi infiltrate the Ministry, Delphi poses as Hermione Granger.

After Albus and Scorpius get back from saving the wizarding world, she steals the time turner in the hope of ruining the past and going back to the rule of Voldemort. She disarmes Albus and Scorpius and later kills Craig Bowker Jr when he happens to wander in on them. She also uses Crucio on Scorpios. Using the time turner, she goes back to the third task of the Triwizard Tornement with the intent of embarrasing Cedric Diggory. However Cedric saves Albus and Scorpius. She then goes back even further to the day when Voldemort kills Lily and James Potter.