Julie Walters As Molly Weasley
This pureblood witch is in charge of the Weasleys, arguably the most powerful wizarding family in the entire story. Molly is a strong character who defeats Bellatrix Lestrange in Part 2 of The Deathly Hallows. Julie Walters has remained relevant in the acting world to this day, starring in films such as Brooklyn, Paddington 2, and Mamma Mia! Here We Go Again. She most recently starred in a remake of The Secret Garden, alongside Colin Firth and others.
Rhys Ifans As Xenophilius Lovegood
To be fair, Rhys Ifans appears late in the game, in The Deathly Hallows Part 1 as Xenophilius Lovegood. He does, however, teach Harry about the symbol after which the film is named, so he plays a significant role in the plot. Ifans had roles in films like The Five Year Engagement and The Amazing Spider-Man shortly after his time in the Harry Potter series. He’ll play Rasputin (of all people) in The King’s Man in 2021.