Marlon appears to have a sackboy-like body, wearing an all-denim suit with golden stiching and brass buttons, but his head is an old film reel, in yellow and red, with a wide mouth and two eyes and black eyebrows, matching with his film roll hair, styled in a pampadour and with the edges as sideburns.
Marlon is, according to Nana Pud, bonkers, as he resides in the swamp, but it used to be Bunkum's most thriving film industry. As a result of this, Marlon believes his life is a movie, and everyone around him are his co-stars. This does not make him arrogant, however, as he gladly takes a co-starring role to let Sackboy and Oddsock take the spotlight. Very dramatic and energetic, hes willing to give an hand when needed, but don't expect it to be a task made calmily, due to his overwhelming exhibit of his acting skills.
The player encounters Marlon in Manglewood, who tells Sackboy that after the three heroes defeated the titans they got bored and lost their marbles.
He, fortunately, knows where OddSock's are, and assists the player in retrieving them, as well as supplying the player with the Blink-Ball. After getting the marbles, he accompanies Sackboy into an old movie set, where the encounter Oddsock. After Sackboy is separated from them, Marlon assists Oddscok in getting them both out of the sticky situation. After the player defeats the green titan, Marlon appears to congratulate them, and sends them, via lift, to the Ziggurat.