Ernie Macmillan

Ernie Macmillan is a Hufflepuff Student in the first video game, LEGO Harry Potter Years 1-4. He can trace his genealogy back nine generations. He is Hannah Abbott's best friend.

Second Year
In Ernie's second year at Hogwarts' School of Witchcraft and Wizardy, He thoroughly believed that Harry Potter was using the Basilisk (or at that time, the monster of Slytherin) to petrify muggle-born students. The Basilisk at that time though, had petrified Hermione Granger, Harry Potter and Ron Weasley's best friend.

Fifth Year
In his fifth year, he developed an irritating habit of keeping track of how many hours he had revised for his O.W.Ls.