Bellatrix Lestrange is the secondary antagonist of the Harry Potter series. She is an incredibly powerful pure-blood witch and the younger sister to Narcissa Malfoy and Andromeda Tonks. She is also the wife of Rodolphus Lestrange, the mother of Delphini, the aunt of Draco Malfoy and the cousin to Sirius and Regulus Black. She was also considered the most loyal and most dangerous servant of Lord Voldemort and a destructive and violent Death-Eater, who have killed and tortured various people throughout her life. She is also the archenemy of Neville Longbottom, having brutally tortured his parents for life.
She serves as a major antagonist of The Order of the Phoenix and The Half-Blood Prince, and the secondary antagonist of The Deathly Hallows Part 1 and The Deathly Hallows Part 2.