The actresses came from various fanfics I've read with Merlin having a sister.

Adelaide Kane, Natalie Dormer, Jenna Coleman, Bridget Regan, Lily James, Lily Collins, Keira Knightley, Sarah Bolger, Anna Popplewell, Emilia Clarke,

Natalie Dormer

Jenna Coleman

Bridget Regan

Lily James

Lily Collins

Keira Knightley

No collar bones? No problem!

Sarah Bolger

Anna Popplewell

Gray hands, ewwwww.

Emilia Clarke