Suggestions by @danielbecker

Olivia Colman

as Bilbo in Daniel's Lord of the Rings

Score: +1

Taika Waititi

as Tom Bombadil in Daniel's Lord of the Rings

Score: +1

Aubrey Plaza

as Gollum in Female Lord of the Rings

Score: -1

Quinta Brunson

as Merry in Comedy Lord of the Rings

Score: +1

Anna Diop

as Lúthien in Beren and Lúthien

Score: +1

Toheeb Jimoh

as Merry in Black Lord of the Rings

Score: +2

Kathryn Hahn

as Theoden in Comedy Lord of the Rings

Score: +1

Quinton Boisclair

as Draugluin in Beren and Lúthien

Score: +1

Lance Reddick

as King of the Dead in Daniel's Lord of the Rings

Score: +1

Andrew Koji

as Curufin in Beren and Lúthien

Score: +1

Paapa Essiedu

as Curufin in Beren and Lúthien

Score: +1

Paapa Essiedu

as Sauron in Beren and Lúthien

Score: +1

Ṣọpẹ́ Dìrísù

as Beren in Beren and Lúthien

Score: +1

Damaris Lewis

as Lúthien in Beren and Lúthien

Score: -1

KiKi Layne

as Lúthien in Beren and Lúthien

Score: -1

Herieth Paul

as Lúthien in Beren and Lúthien

Score: -1

Anok Yai

as Thuringwethil in Beren and Lúthien

Score: +1

Anok Yai

as Lúthien in Beren and Lúthien

Score: -1

Tony Leung Chiu-wai

as Thingol in Beren and Lúthien

Score: +1

Carl Clemons-Hopkins

as Celeborn in Beren and Lúthien

Score: +1