David Haller / Legion
Dan Stevens
Lenore "Lenny" Busker
Aubrey Plaza
Syd
Rachel Keller
Ptonomy Wallace
Jeremie Harris
Cary Loudermilk
Bill Irwin
Kerry Loudermilk
Amber Midthunder*
Amahl Farouk / Shadow King
Navid Negahban
Amy Haller
Katie Aselton
Kerry Loudermilk
Amber Midthunder
Melanie Bird
Jean Smart
Clark Debussy
Hamish Linklater
Jia-Yi / Switch
Lauren Tsai
The Eye
Mackenzie Gray
David Haller (6-8 Years) / David
Luke Roessler
Devil with the Yellow Eyes
Quinton Boisclair
Philly
Ellie Araiza
Angry Boy
Devyn Dalton
Gabrielle
Stephanie Corneliussen
Oliver Bird
Jemaine Clement
Rudy
Brad Mann
The Monk
Nathan Hurd
Charles Xavier / Professor X
Harry Lloyd
Dr. Poole
Scott Lawrence
Benny / Large Man Karl
Kirby Morrow
Brubaker
David Selby
Dr. Kissinger
David Ferry
David's Mother
Tatyana Forrest
David's Father
Dario Giordani
David (4 Years Old)
Christian Convery