HBO has completed casting for the second season of its Harry Potter television adaptation, announcing three key roles for the ensemble. Billy Barratt will play the teenage incarnation of Tom Riddle, the younger form of Lord Voldemort, whilst Lenny Rush has been cast as Dobby, the house-elf character crucial to the story. Bonnie Hill joins the cast as Ginny Weasley, replacing original actress Gracie Cochrane who departed following the first season.

These casting decisions mark a significant milestone as the adaptation transitions from Philosopher's Stone into Chamber of Secrets territory. The three roles are essential to the second season's narrative, with Tom Riddle's presence integral to the story's central mystery and Dobby providing a pivotal connection throughout the season's events. The announcements bring the ensemble to full strength ahead of the production's move into the new book adaptation.