Suggestions by @wanwagwawa

Chaos Knuckles

as Henchman 24 (Ghost) in The Venture Bros (Live-Action)

Katerina Kittycat

as Dean and Hank's cat in The Venture Bros (Live-Action)

Captain Sunshine

as Captain Sunshine in The Venture Bros (Live-Action)

Youtube movies

as Brick Frog in The Venture Bros (Live-Action)

Steve Smith

as Rare Dean in The Venture Bros (Live-Action)

Grace (Home on the Range)

as Henchman #1 in The Venture Bros (Live-Action)

Baby Yoshi

as Baron Underbite in The Venture Bros (Live-Action)

Ding Dong

as Cano in The Venture Bros (Live-Action)

Chris Griffin

as Action Johnny in The Venture Bros (Live-Action)

Robotomy

as Speedy Henchman in The Venture Bros (Live-Action)

Starfire Movies

as Dr. Orpheus in The Venture Bros (Live-Action)

Toy Bonnie

as Hank 2 in The Venture Bros (Live-Action)