The sixth and final season's main cast was reduced to nine: Colfer, Criss, Lynch, Mc Hale, Michele, Morrison and Overstreet continued from the previous season, Riley returned to the main cast, and Dot-Marie Jones as football coach Shannon Beiste was promoted to it.
The series has many supporting characters, including faculty members, students and relatives of the glee club members.
The role of Rachel was written specifically for Michele.
Chris Colfer (Kurt Hummel) had originally auditioned to play Artie Abrams.
Although Colfer had no previous professional experience, Murphy was so impressed by Colfer's performance that the role of Kurt Hummel, named after the character Kurt from The Sound of Music, was created for him.