Suggestions by @lifluw

Amita Suman

as Twilight Sparkle in My Little Pony

Score: +1

Luna Blaise

as Twilight Sparkle in My Little Pony

Score: +2

Olivia Rodrigo

as Twilight Sparkle in My Little Pony

Score: -1

Amandla Stenberg

as Pinkie Pie in My Little Pony

Score: +1

Sophia Lillis

as Pinkie Pie in My Little Pony

Score: +1

AnnaSophia Robb

as Apple Jack in My Little Pony

Score: +1

Maya Hawke

as Apple Jack in My Little Pony

Score: +1

Chosen Jacobs

as Spike in My Little Pony

Score: +1

Jack Dylan Grazer

as Spike in My Little Pony

Score: +1

Sadie Sink

as Sunset Shimmer in My Little Pony

Score: +1

Megan Fox

as Rarity in My Little Pony

Score: +1

Kristen Stewart

as Rainbow Dash in My Little Pony

Score: +2

Hunter Schafer

as Flutershy in My Little Pony

Score: 0

Anna Taylor-Joy

as Flutershy in My Little Pony

Score: +1

Elle Fanning

as Flutershy in My Little Pony

Score: +1

AnnaSophia Robb

as Applejack in My Little Pony: Equestria Girls (Live-Action)

Score: -1

Mckenna Grace

as Fluttershy in My Little Pony: Equestria Girls (Live-Action)

Score: -1

Hannah Murray

as Pinkie Pie in My Little Pony: Equestria Girls (Live-Action)

Score: +2

Mckenna Grace

as Spider gwen in Spiderverse

Score: +1

Amybeth McNulty

as Izzy in Total Drama Island (livecast)

Score: +5