Ernie Macmillan
Ernie Macmillan is a Hufflepuff student in Harry Potter's year at Hogwarts School of Witchcraft and Wizardry. He is a stout, earnest boy who takes his studies and his house's reputation seriously, and he plays a notable role in the school's response to the attacks of the Chamber of Secrets, first as a vocal accuser of Harry Potter and later as a remorseful ally.
Identity and Background
Ernie is a pure-blood wizard, a fact he is quick to assert when he feels threatened. During a tense confrontation in the library, he tells Harry, "I might tell you that you can trace my family back through nine generations of witches and warlocks and my blood's as pure as anyone's." This declaration reveals both his pride in his lineage and his fear that the Heir of Slytherin—whom he believes to be Harry—might target Muggle-borns. Ernie is also well-informed about wizarding lore; he explains to his fellow Hufflepuffs that being a Parselmouth is "the mark of a Dark wizard" and that Salazar Slytherin himself was called "Serpent-tongue." His knowledge of the founders' history and his willingness to share it mark him as a student who values tradition and is alert to the dangers of the magical world.
Role in the Chamber of Secrets Crisis
When the attacks begin, Ernie becomes one of the most outspoken students against Harry. After the Dueling Club incident, where Harry speaks Parseltongue to a snake, Ernie tells a group of Hufflepuffs in the library that Harry is the Heir of Slytherin. He points to a chain of circumstantial evidence: Harry had a run-in with Argus Filch before Mrs. Norris was Petrified, and Colin Creevey, who had been pestering Harry for photographs, was attacked next. Ernie also notes that Justin Finch-Fletchley, a Muggle-born who had told Harry he was originally down for Eton, had been hiding in fear. Ernie's reasoning, though flawed, reflects the widespread panic and the logical—if mistaken—conclusions many students drew from the available facts. He even confronts Harry directly in the library, accusing him of chasing the snake toward Justin, and later, when Justin and Nearly Headless Nick are found Petrified, Ernie arrives on the scene and shouts, "Caught in the act!" pointing dramatically at Harry.
Change and Apology
Ernie's attitude undergoes a significant shift after Hermione Granger, a Muggle-born and one of Harry's closest friends, is also attacked and Petrified. This event forces Ernie to reconsider his suspicions. In a Herbology class, he approaches Harry and formally apologizes. "I just want to say, Harry, that I'm sorry I ever suspected you," he says, holding out a pudgy hand. "I know you'd never attack Hermione Granger, and I apologize for all the stuff I said. We're all in the same boat now." Harry shakes his hand, accepting the apology. This moment marks Ernie's growth from a fearful accuser to a more thoughtful and fair-minded student, capable of admitting his mistake. He then turns his suspicion toward Draco Malfoy, noting that Malfoy "seems very pleased about all this," and asks Harry directly if he thinks Malfoy is the Heir of Slytherin. Harry firmly says no, but Ernie's willingness to seek the truth rather than cling to his earlier prejudice shows a maturing judgment.
Thematic Significance
Ernie Macmillan embodies the theme of prejudice and the danger of jumping to conclusions based on fear and incomplete evidence. His initial certainty that Harry is the Heir of Slytherin—fueled by Harry's Parseltongue ability and the pattern of attacks—mirrors the wider school's hysteria and the pure-blood ideology that the Heir of Slytherin represents. Yet Ernie's capacity to apologize and change his mind demonstrates that even those caught up in fear can choose reason and fairness. His arc serves as a counterpoint to characters like Draco Malfoy, who remain entrenched in their biases, and reinforces the novel's message that true character is revealed not by blood or rumor, but by one's choices and capacity for growth.
