Since this initial set of appearances, Marx has frequently appeared in subsequent games, though usually as little more than a cameo or reference. In The True Arena, Marx is subsequently reincarnated into Marx Soul by absorbing pieces of the destroyed Nova, forcing Kirby to battle him again, though whether or not this battle officially happens in the main storyline is not confirmed. With this power, Marx intends to take over Popstar so that he can cause all the mischief he wants, so Kirby uses the Starship to chase him down and defeats both him and Galactic Nova, sending Marx careening into Nova to blow it to smithereens. In this role, he feigns to be Kirby's ally and instructs him to summon Galactic Nova to stop the Sun and Moon from fighting, but then steals Kirby's wish at just the right moment to gain immense magical power. Marx is a mischievous, small, round, jester-like creature from Popstar who serves as the final boss and main antagonist of Milky Way Wishes from Kirby Super Star and its remake, Kirby Super Star Ultra. Marx in Milky Way Wishes, Kirby Super Star Ultra it was all according to my perfect little plan! Now I can cause all the mischief I want! Haha! See you later! I did it! It all went according to plan! I got the sun and moon to fight. Clip of Marx's boss battle theme from Kirby Super Star Ultra

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