Suggestions by @jdfitzgerald

J.K. Simmons

as G.U.N. COMMANDER in SUPER SMASH BROS THE ANIMATED SERIES

Freddie Highmore

as PIT in SUPER SMASH BROS THE DARK PROPHECY

Ron Perlman

as BOWSER in MARIO VS SONIC

Danny DeVito

as MARIO in MARIO VS SONIC

Gaten Matarazzo

as BOWSER JR in WALUIGI IS NUMBER 1

Khary Payton

as DK in WALUIGI IS NUMBER 1

Kevin Michael Richardson

as KAMEK in WALUIGI IS NUMBER 1

Scarlett Johansson

as ROSALINA in WALUIGI IS NUMBER 1

Alan Tudyk

as YOSHI in WALUIGI IS NUMBER 1

Emma Watson

as DAISY in WALUIGI IS NUMBER 1

Jodi Benson

as PEACH in WALUIGI IS NUMBER 1

Jack McBrayer

as TOAD in WALUIGI IS NUMBER 1

John Cleese

as TOADSWORTH in WALUIGI IS NUMBER 1

Matt Berry

as KING BOO in WALUIGI IS NUMBER 1

Ron Perlman

as BOWSER in WALUIGI IS NUMBER 1

Charlie Day

as LUIGI in WALUIGI IS NUMBER 1

Jake Johnson

as WALUIGI in WALUIGI IS NUMBER 1

Danny DeVito

as MARIO in WALUIGI IS NUMBER 1

Lewis Black

as WARIO in WALUIGI IS NUMBER 1

Taron Egerton

as Link (BOTW) in Super Smash Bros The Animation (Eng dub)