Suggestions by @jackamos2019

Amy Gumenick

as Carrie Cutter in Arrow

Score: +2

Matt Nable

as Ra's Al Ghul in Arrow

Score: 0

Christina Cox

as Celia Castle in Arrow

Score: +1

Vinnie Jones

as Danny Brickwell in Arrow

Score: +1

Nolan Gerard Funk

as Cooper Seldon in Arrow

Score: +1

Matt Ward

as Simon Lacroix in Arrow

Score: +1

Nick E. Tarabay

as Digger Harkness in Arrow

Score: +1

Doug Jones

as Jake Simmons in Arrow

Score: +1

Eugene Byrd

as Andy Diggle in Arrow

Score: +1

Brandon Routh

as Ray Palmer in Arrow

Score: +1

J.R. Ramirez

as Ted Grant in Arrow

Score: +1

Peter Stormare

as Werner Zytle in Arrow

Score: +2

Karl Yune

as Maseo Yamashiro in Arrow

Score: +3

Summer Glau

as Isavel Rochev in Arrow

Score: +2

Kevin Alejandro

as Sebastian Blood in Arrow

Score: +2

Cynthia Addai-Robinson

as Amanda Waller in Arrow

Score: +1

Teryl Rothery

as Jean Loring in Arrow

Score: +1

Dylan Bruce

as Adam Donner in Arrow

Score: +1

Bex Taylor-Klaus

as Sin in Arrow

Score: +1

Dylan Neal

as Anthony Ivo in Arrow

Score: +1