Suggestions by @morganelise

Skandar Keynes

as Henry in Dear Diary

Score: -1

Bill Milner

as Jordan in Dear Diary

Score: +2

Charlie Rowe

as Charlie Hudson in Dear Diary

Score: +7

Harry Styles

as Charlie Hudson in Dear Diary

Score: +4

Dean-Charles Chapman

as Dean in Dear Diary

Score: +6

George MacKay

as George in Dear Diary

Score: +9

Annie Wilson

as Grace in Dear Diary

Score: +15

George MacKay

as King Arthur in Excalibur: The Legend Of King Arthur

Score: -2

Bree Paige

as Zoe Stevens in Bad Romeo

Score: +1

Ryan Potter

as Xander Harris in Buffy the Vampire Slayer (Reboot/Remake)

Score: -19

Annie Wilson

as Buffy Summers in Buffy the Vampire Slayer (Reboot/Remake)

Score: -18

Ben Hardy

as King Arthur in Excalibur: The Legend Of King Arthur

Score: -5