Suggestions by @markclaunch

Uma Thurman

as Queen Kayne in Once... The First Book of Arthur

Score: +1

Stephen Lang

as King Lot in Once... The First Book of Arthur

Score: +1

Gina Torres

as Queen Badd in Once... The First Book of Arthur

Score: +1

Ving Rhames

as King Badd in Once... The First Book of Arthur

Score: +1

Julianne Moore

as Queen Rey in Once... The First Book of Arthur

Score: +1

James Cromwell

as King Ban in Once... The First Book of Arthur

Score: +1

Christina Hendricks

as Queen Gwyneth in Once... The First Book of Arthur

Score: +1

Ron Perlman

as King Leodegrance in Once... The First Book of Arthur

Score: +1

Christopher Plummer

as King Vortigern in Once... The First Book of Arthur

Score: +1

Maggie Gyllenhaal

as Mother Superior in Once... The First Book of Arthur

Score: +1

Gary Oldman

as Zealotus in Once... The First Book of Arthur

Score: +1

J.K. Simmons

as Malleus in Once... The First Book of Arthur

Score: +1

Benedict Cumberbatch

as Archbishop of Canterbury in Once... The First Book of Arthur

Score: +1

Edward James Olmos

as Archpriest in Once... The First Book of Arthur

Score: +1

Harry Styles

as Thax in Once... The Book of Merlin

Score: +1

Isabela Merced

as Vell in Once... The Book of Merlin

Score: +1

Tig Notaro

as Redd in Once... The Book of Merlin

Score: +1

Ricky Gervais

as Father Twist in Once... The Book of Merlin

Score: +1

Sadie Sink

as Teenage Princess Anna in Once... The First Book of Arthur

Score: +1

Rowan Blanchard

as Teenage Morgana in Once... The First Book of Arthur

Score: +1