Suggestions by @steelsheik

Laurie Shepherd

as Draco Malfoy in Harry Potter

Bobby O'Neill

as Vincent Crabbe in Harry Potter

Benjamin Evan Ainsworth

as Dudley Dursley in Harry Potter

Holly Hajbok

as Luna Lovegood in Harry Potter

Ivy Wong (II)

as Cho Chang in Harry Potter

Matthew Illesley

as Ron Weasley in Harry Potter

Isla Johnston

as Ginevra "Ginny" Weasley in Harry Potter

Lily-Rose Depp

as Bellatrix Lestrange in Harry Potter

Max Vento

as Harry Potter in Harry Potter

Florence Keen

as Luna Lovegood in Harry Potter

Indica Watson

as Hermione Granger in Harry Potter

Bronte Carmichael

as Hermione Granger in Harry Potter

Jared Harris

as Albus Dumbledore in Harry Potter

Jacob Tremblay

as Kappa in Castle Swimmer

Rose Leslie

as Triss in The Witcher

FAKE

as Yennefer in The Witcher

Andrew Bachelor

as Jack Daltry in The Vampire Diaries

Alex Saxon

as Matt Honeycutt in The Vampire Diaries

Eija Skarsgård

as Celine Mikaelson in The Vampire Diaries

Sam Skarsgård

as Benevenuto Mikaelson in The Vampire Diaries