The HouseGuests that make up the top 50% of confessionals get declared to be the "main cast." For example if Glenn gets 25%, and the next most is Steve with 15%, and the next most is Cliff with 10%, then those 3 would be the "main cast."
BB2
Will Kirby
Nicole Nilson-Schaffrich
Hardy Ames-Hill
BB3
Danielle Reyes
Lisa Donahue
Marcellas Reynolds
Jason Guy
BB4
Alison Irwin
Jun Song
Robert Roman
Erika Landin
BB5
Diane Henry
Marvin Latimer
Drew Daniel
Cowboy Ellis
Jase Wirey
BB6
Ivette Corredero
Janelle Pierzina
Maggie Ausburn
Howie Gordon
James Rhine
BB7
Will Kirby
Mike Boogie
Janelle Pierzina
Danielle Reyes
BB8
Daniele Donato
Dick Donato
Eric Stein
Jessica Hughbanks
Jameka Cameron
BB9
Sheila Kennedy
Adam Jasinski
Ryan Quicksall
Natalie Cunial
Joshuah Welch
BB10
Dan Gheesling
Memphis Garrett
Keesha Smith
Jerry MacDonald
BB11
Kevin Campbell
Jeff Schroeder
Russell Kairouz
Jordan Lloyd
Danielle Reyes
Lisa Donahue
Marcellas Reynolds
Jason Guy