Adding now:SPECIAL GUEST STARS/STUNT CASTING: (People who would be unavailable/unlikely to commit long term)
- Jensen Ackles
- Ben Barnes
- Alexis Bledel
- Sophia Bush
- Holly Marie Combs
- Rachael Leigh Cook
- Johnny Depp(next to impossible.)
- Taye Diggs
- Sara Michelle Geller
- Seth Green
- Alyson Hannigan
- Anne Hathaway
- Takeshi Kaneshiro
- James McAvoy
- Ewan McGreagor
- Wentworth Miller
- Mandy Moore
- Viggo Mortenson
- Jared Padalecki
- Robert Pattinson
- Donald Sutherland
- Emmanuelle Vaugier
- Evan Rachel Wood(unlikely)
'ARC' CHARACTERS: (People who are on for a limited time, but are there for several episodes)
- Sean Bean
- Gigi Edgely
- Kyle Gallner
- Maggie Grace
- Ryan Hansen
- Raelee Hill
- John Leguizamo
- Katie Leung
- Matt Lewis
- Evanna Lynch
- Anna Paquin
- Emma Roberts
- Ricky Ullman
- Wil Wheaton
- Victor Webster
- Lee Thompson Young
- Christopher Walken
SEMI-REGULARS (Guest stars whose characters return freqently)
- Rachel Bilson
- Joan Collins
- Common
- Victor Garber
- Daneel Harris
- David Jason
- Dominic Monaghan
- Timothy Olyphant
- Terry O'Quinn
- Tessie Santiago
- Brenda Song
- Danny Strong
- Rachael Taylor
- Kevin Weisman
- Peter Wingfield
REGULARS: (People who have signed long term contracts)
- Adwale Akinnoye Agboge
- Devonne Aoki
- Dante Basco
- Nadia Bjorlin
- Majandra Delfino
- Jason Dohring
- Chris Egan
- Brendan Fehr
- Lucas Grabeel
- Elizabeth Harnois
- Tyler Hoechili
- Djimon Honsou
- Bianca Lawson
- Will Yun Lee
- Lindze Letherman
- James Marsters
- Taj Mowery
- Larisa Oleynick
- Victoria Pratt
- David Reivers
- Ashley Scott
- Ian Somerhalder
- Scott Speedman
- Shane Taylor
- Max Theriot
- Paul Walker