Suggestions by @b18

Jessica Alba

as Elia Martell in ASOIAF

Michael Fassbender

as Edmure Tully in ASOIAF

Selena Gomez

as Asha Greyjoy in ASOIAF

Taylor Lautner

as Theon Greyjoy in ASOIAF

Hugh Jackman

as Jorah Mormont in ASOIAF

Daniel Radcliffe

as Renly Baratheon in ASOIAF

Scarlett Johansson

as Val in ASOIAF

Elizabeth Olsen

as Catelyn Stark in ASOIAF

Chris Hemsworth

as Rhaegar Targaryen in ASOIAF

Javier Bardem

as Doran Martell in ASOIAF

Robert Downey Jr.

as Oberyn Martell in ASOIAF

Ansel Elgort

as Garlan Tyrell in ASOIAF

Ashley Olsen

as Lysa Arryn in ASOIAF

Alexander Skarsgård

as Jaime Lannister in ASOIAF

Elle Fanning

as Sansa Stark in ASOIAF

Shane Harper

as Loras Tyrell in ASOIAF

Famke Janssen

as Melisandre of Asshai in ASOIAF

Jared Leto

as Ned Stark in ASOIAF

Rupert Grint

as Robb Stark in ASOIAF

Anna Paquin

as Cersei Lannister in ASOIAF