Suggestions by @whaekay

Holly Taylor

as Olivia Wood in Harry Potter and the philosophers stone (gender swap)

Imelda Staunton

as Agnes Filch in Harry Potter and the philosophers stone (gender swap)

Eve Harlow

as Sloane Snape in Harry Potter and the philosophers stone (gender swap)

Sophia Bush

as Quinthina Quirrell in Harry Potter and the philosophers stone (gender swap)

Ronja Forcher

as Sloane Snape in Harry Potter and the philosophers stone (gender swap)

Cherry Chevapravatdumrong

as Sloane Snape in Harry Potter and the philosophers stone (gender swap)

Shannon Purser

as Natalie Longbottom in Harry Potter and the philosophers stone (gender swap)

Jim Broadbent

as Prof. Miles McGonagall in Harry Potter and the philosophers stone (gender swap)

Madelaine Petsch

as Pricilla Weasley in Harry Potter and the philosophers stone (gender swap)