Suggestions by @dilhowlter

Ben Whishaw

as Doug Rattmann in Portal

Score: +1

Natalie Gold

as Caroline in Portal

Score: +1

Glenn Howerton

as Cave Johnson in Portal

Score: +1

Stephen Merchant

as Wheatley in Portal

Score: +1

Ellen McLain

as GLaDOS in Portal

Score: +1

Sea Shimooka

as Chell in Portal

Score: 0