Ernie

Ernie Macmillan's personality is characterized by his loyalty, honesty, hard work, and a somewhat pompous demeanor, which often manifests as a know-it-all attitude or a habit of holding grudges, but ultimately stems from his good heart. Despite initial judgmental tendencies and a belief in pure-blood status, he quickly learns from his mistakes, offering sincere apologies, and becomes a brave and supportive member of Dumbledore's Army. Ernie is also known for his enthusiasm, particularly for his studies, and can be quite headstrong and opinionated, yet he remains a fiercely loyal and dependable friend.