Sabrina Carpenter as Elowen Ocean

Bailee Madison as Violet Star

Taylor Swift as Cybele Dean

Oliver Phelps as George Weasley

Edward Pattinson as Cedric Diggory

Corey Fogelmanis as Elowen's Brother (mentioned a lot), Alexander

Lily Collins as Ella Rose Mason (friend introduced in the book)

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Daniel Radcliffe as Harry Potter

(I couldn't find the template for this so that's why it is different)