Suggestions by @emmanissen

Caleb Landry Jones

as Arthur Weasley in The Marauders(story removed)

Score: +4

Oliver Dale

as Gideon/Fabian Prewett in The Marauders(story removed)

Score: +4

Freya Mavor

as Petunia Evans in The Marauders(story removed)

Score: -3

Charlie Heaton

as Frank Longbottom in The Marauders(story removed)

Score: -4

Christian Bale

as Orion Black in The Marauders(story removed)

Score: +5

Matthew Perry

as Fleamont Potter in The Marauders(story removed)

Score: -7

Léa Seydoux

as Mary Macdonald in The Marauders(story removed)

Score: -35

Bárbara Mori

as Evelyn Sadar in School For Good And Evil(story removed)

Score: +1

Aysha Benelli

as Dot in School For Good And Evil(story removed)

Score: +2

Frances McDormand

as Clarissa Dovey in School For Good And Evil(story removed)

Score: 0

Gregory Kasyan

as Chaddick in School For Good And Evil(story removed)

Score: +1

Tao Okamoto

as Callis in School For Good And Evil(story removed)

Score: +2

Emily Skinner

as Beatrix in School For Good And Evil(story removed)

Score: +1

Charles Myara

as August Sadar in School For Good And Evil(story removed)

Score: +1

Brandon Rossel

as Aric in School For Good And Evil(story removed)

Score: +2

Ivy Wolk

as Anadil in School For Good And Evil(story removed)

Score: +4

Indiana Massara

as Agatha in School For Good And Evil(story removed)

Score: +4