Suggestions by @fanvoicesmatter

Stan Lee

as Cameo in The Ultimates 2: Part Two

Score: +1

Ben Stiller

as Forge in Ultimate Wolverine vs. Hulk

Score: +1

George Takei

as Steve in Ultimate Wolverine vs. Hulk

Score: +1

Darren Chen

as Panchen Lama in Ultimate Wolverine vs. Hulk

Score: +1

Mark Ruffalo

as Bruce Banner in Ultimate Wolverine vs. Hulk

Score: +2

Samuel L. Jackson

as Nick Fury in Ultimate Wolverine vs. Hulk

Score: +1

Alison Brie

as Jennifer Walters in Ultimate Wolverine vs. Hulk

Score: +1

Liv Tyler

as Betty Ross in Ultimate Wolverine vs. Hulk

Score: +2

Stan Lee

as Cameo in Ultimate Wolverine vs. Hulk

Score: +1

Alexandra Shipp

as Ororo Munroe in Ultimate Extinction

Score: +1

Tye Sheridan

as Scott Summers in Ultimate Extinction

Score: +1

Paul Bettany

as Vision in Ultimate Extinction

Score: +1

Yura Borisov

as Silver Wings in Ultimate Extinction

Score: +1

Graham McTavish

as Gah Lak Tus in Ultimate Extinction

Score: +1

Kate Beckinsale

as Jean DeWolff in Ultimate Extinction

Score: +1

Sophie Turner

as Jean Gray in Ultimate Extinction

Score: +1

Chris Evans

as Steve Rogers in Ultimate Extinction

Score: +2

Uma Thurman

as Heather Douglas in Ultimate Extinction

Score: +1

Nicki Minaj

as Misty Knight in Ultimate Extinction

Score: 0

Brie Larson

as Carol Danvers in Ultimate Extinction

Score: +2