Marx is one of the main antagonists of the Kirby series, he is one of the minions of Lord Orochi, during his gauntlets of tournaments, and he is one of the archenemies of Kirby.
He is voiced by Wally Wingert in normal form and Micheal Dorn in his soul form in the English dub and Kappei Yamaguchi and Akio Otsuka in the Japanese dub.