Fan Casting Harry Potter the Series

Harry Potter is a series of seven fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley, all of whom are students at Hogwarts School of Witchcraft and Wizardry. I am only focusing on characters who were older than 17 in the first book. Students should be unknowns like it was in the movies. I also will not be limiting myself with only actors from the UK/Ireland area.