Suggestions by @markclaunch

Laya DeLeon Hayes

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

Score: +1

Milo Manheim

as Teenage Sir Percial in Once... The First Book of Arthur

Score: +1

Aidan Gallagher

as Teenage Sir Tristian in Once... The First Book of Arthur

Score: +1

Ezra Miller

as Fleet in Once... The Book of Merlin

Score: +1

Asher Angel

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

Score: +1

Noah Schnapp

as Teenage Sir Gareth in Once... The First Book of Arthur

Score: +1

Noah Schnapp

as Teenage Sir Gaheris in Once... The First Book of Arthur

Score: +1

Finn Wolfhard

as Teenage Sir Gawain in Once... The First Book of Arthur

Score: +1

Caleb McLaughlin

as Teenage Sir Kay in Once... The First Book of Arthur

Score: +1

Eleanor Worthington-Cox

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

Score: +1

Nicolas Cage

as Red Wizard in Once... The Book of Merlin

Score: +1

William Fichtner

as Paladin Knight in Once... The Book of Merlin

Score: +1

Forest Whitaker

as African Shaman in Once... The Book of Merlin

Score: +1

John Malkovich

as Jovan in Once... The Book of Merlin

Score: +1

Patton Oswalt

as Luuk in Once... The Book of Merlin

Score: +1

John C. Reilly

as Vox in Once... The Book of Merlin

Score: +1

Robbie Coltrane

as Dwell in Once... The Book of Merlin

Score: +1

Matt Lucas

as Timble in Once... The Book of Merlin

Score: +1

Maggie Gyllenhaal

as Mother Superior in Once... The Book of Merlin

Score: +1

Matt Smith

as Jack in the Green in Once... The Book of Merlin

Score: +1