Suggestions by @justinbigdude

Dylan O'Brien

as Royal Guard #1 in Undertale

Score: +1

Michael Keaton

as Flowey in Undertale

Score: 0

Adam Driver

as Flowey in Undertale

Score: 0

Jimmy Donaldson

as Mettaton in Undertale

Score: +1

Toby Fox

as Composer in Undertale

Score: +1

Sebastian Stan

as Lieutenant James Armbridge in Undertale

Score: +1

Frank Welker

as Monsters in Undertale

Score: 0

Toby Fox

as Writer in Undertale

Score: +1

Toby Fox

as Director in Undertale

Score: +1

Jim Carrey

as Sans in Undertale

Score: -5

Dove Cameron

as Nienke Meijer in Six Siege

Score: +1

Thomas Brodie-Sangster

as Seamus Cowden in Six Siege

Score: +1

Brie Larson

as Meghan J. Castellano in Six Siege

Score: +1

Jake Gyllenhaal

as Sebastian Cote in Six Siege

Score: +1

Daniel Brühl

as Elias Kotz in Six Siege

Score: +1

Liam Neeson

as Seamus Cowden in Six Siege

Score: -1

Ewan McGregor

as Mike Baker in Six Siege

Score: +1

Riz Ahmed

as Abbad Sabbagh in Six Siege

Score: +1

Tom Hardy

as Sam Fisher in Six Siege

Score: +1

Jamie Chung

as Grace Nam in Six Siege

Score: +1