Suggestions by @emmgc

Harry Gilby

as Fitz (as a teenager) in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Omar Rudberg

as Fitz (as a teenager) in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Jaime Campbell Bower

as Fool in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Aaron Taylor-Johnson

as Verity in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Josh Heuston

as Fitz (as a young adult) in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Harry Gilby

as Fitz (as a young adult) in The Farseer Trilogy (Assassin’s Apprentice/Royal Assassin/Assassin’s Quest)

Brenton Thwaites

as Brashen Trell in Liveship Trilogy (Ship of Magic/The Mad Ship/Ship of Destiny)

Owen Cooper

as Wintrow Vestrit in Liveship Trilogy (Ship of Magic/The Mad Ship/Ship of Destiny)