Suggestions by @ user_340311

Dominic West

as Mance Rayder in Game Of Thrones

Matthew Goode

as Balon Greyjoy in Game Of Thrones

Evan Rachel Wood

as Catelyn Stark in A Song of Ice and Fire

+2-1Score: +1

Nicolas Cage

as Stannis Baratheon in Game of Thrones (2001-11)

Ivan Kaye

as Robert Baratheon in Game of Thrones (2001-11)

+1-2Score: -1

Tamzin Merchant

as Daenerys Targaryen in Game of Thrones (2001-11)

+5-0Score: +5

Ben Barnes

as Jon Snow in Game of Thrones (2001-11)

Evan Rachel Wood

as Lady Catelyn Stark in A Game Of Thrones

+2-2Score: 0

Matt Lucas

as Varys in A Clash Of Kings

Evan Rachel Wood

as Catelyn Stark in A Clash Of Kings

Leo Woodruff

as Howland Reed in Robert's Rebellion / The Storm King

Leo Woodall

as Howland Reed in Robert's Rebellion / The Storm King

Stephen Lang

as Gerold Hightower in Robert's Rebellion / The Storm King

Peter Capaldi

as Aerys Targaryen in Robert's Rebellion / The Storm King

+1-3Score: -2

Sadie Sink

as Sansa Stark in A Song of Ice and Fire

Evan Rachel Wood

as Lady Catelyn Stark in A Song of Ice and Fire

Millie Bobby Brown

as Margaery Tyrell in A Song of Ice and Fire

Lester Speight

as Strong Belwas in A Song of Ice and Fire

Matt Lucas

as Varys in A Song of Ice and Fire