
Daniel Radcliffe as Harry Potter, the film's main protagonist. Rupert Grint as Ron Weasley, Harry's best friend and Hermione's romantic interest.[12] Emma Watson as Hermione Granger, Harry's other best friend and Ron's romantic interest. Helena Bonham Carter as Bellatrix Lestrange, a Death Eater, the film's secondary antagonist and Sirius Black's cousin and murderer. Jim Broadbent as Horace Slughorn, the potions master at Hogwarts. Robbie Coltrane as Rubeus Hagrid, Harry's half-giant friend and a former teacher at Hogwarts. Warwick ...