Suggestions by @186fleetstreet

Brian Blessed

as Samaranth in Chronicles of the Imaginarium Geographica

Score: +1

Colin Baker

as Tummeler in Chronicles of the Imaginarium Geographica

Score: +1

Christopher Eccleston

as Tummeler in Chronicles of the Imaginarium Geographica

Score: +2

Alexander Vlahos

as Young Mordred in Chronicles of the Imaginarium Geographica

Score: +1

Richard E. Grant

as The Cricket King in Chronicles of the Imaginarium Geographica

Score: +1

Jason Isaacs

as The Cricket King in Chronicles of the Imaginarium Geographica

Score: +1

Miles Richardson

as The Cricket King in Chronicles of the Imaginarium Geographica

Score: +1

Richard E. Grant

as The Winter King in Chronicles of the Imaginarium Geographica

Score: +1

Jason Isaacs

as The Winter King in Chronicles of the Imaginarium Geographica

Score: +1

Miles Richardson

as The Winter King in Chronicles of the Imaginarium Geographica

Score: +1

Alice Krige

as Future Aven in Chronicles of the Imaginarium Geographica

Score: +2

Anna Popplewell

as Older Aven in Chronicles of the Imaginarium Geographica

Score: 0

Claire Danes

as Older Aven in Chronicles of the Imaginarium Geographica

Score: +3

Claire Danes

as Aven Wells in Chronicles of the Imaginarium Geographica

Score: +3

Anna Popplewell

as Aven Wells in Chronicles of the Imaginarium Geographica

Score: +1

Dan Stevens

as Older Artus in Chronicles of the Imaginarium Geographica

Score: +1

Sam Claflin

as Older Artus in Chronicles of the Imaginarium Geographica

Score: +1

Colin Morgan

as Older Artus in Chronicles of the Imaginarium Geographica

Score: +2

Sam Claflin

as Artus in Chronicles of the Imaginarium Geographica

Score: +1

Anton Yelchin

as Artus in Chronicles of the Imaginarium Geographica

Score: 0