Ernie Macmillan

Ernest "Ernie" Macmillan is a supporting character in the live-action film adaptation of the Harry Potter book series. During his time at Hogwarts, he was sorted into Hufflepuff, where he became best friends with Justin Finch-Fletchley and Hannah Abbott.

Harry Potter and the Chamber of Secrets
During his second year, Ernie believed the rumors that Harry was the heir of Slytherin. However, he stopped believing in them when Hermione Granger fell victim to the attacks and Ernie was aware that Harry would never harm his best friends.

Harry Potter & the Order of the Phoenix
Despite his apologies, Ernie was one of the few people who believed Harry Potter when he said Voldemort returned.