Suggestions by @catalazcano

Amber Heard

as Rhaenys Targaryen in GOT: Aegon's War of Conquest

Score: -10

Thea Sofie Loch Næss

as Rhaenys Targaryen in GOT: Aegon's War of Conquest

Score: -7

Alexander Ludwig

as Aegon I Targaryen in GOT: Aegon's War of Conquest

Score: -10

Benjamin Wadsworth

as Mike in Our Kind Of Cruelty

Score: +1

Carlson Young

as Verity in Our Kind Of Cruelty

Score: +2

Zane Holtz

as Manson in The Dare

Score: +1

Jessica Rothe

as Jessica in The Dare

Score: +1

Katie McGrath

as Scarlett in Caraval

Score: -29

Finn Wolfhard

as Kit Whitely in Forbidden

Score: +2

Finn Wolfhard

as Kit in Forbidden / Prohibido

Score: +1

Finn Wolfhard

as Kit in Still Beating

Score: +1

Jared Padalecki

as Dean Asher in Still Beating

Score: -4

Aaron Taylor-Johnson

as Lochan Whitely in Forbidden

Score: 0

Jackson Rathbone

as Lochan Whitely in Forbidden

Score: 0

Abigail Cowen

as Maya Whitely in Forbidden

Score: 0

Mia Healey

as Corabelle Lawson in Still Beating

Score: -3

Mia Healey

as Dean in Still Beating

Score: +1

Aaron Taylor-Johnson

as Lochan in Forbidden / Prohibido

Score: +1

Jackson Rathbone

as Lochan in Forbidden / Prohibido

Score: +2

Abigail Cowen

as Maya in Forbidden / Prohibido

Score: +2