A Chroma Oxide, a person that makes a living by waiting for a Chroma to near the completion of their assigned job and then takes proof of the work's completion in order to steal the reward. Willing to do anything and step on anyone to achieve his goals, Walnut is the older brother of Marona's newfound friend Castile, and puts aside his Chroma Oxide earnings to pay for an operation for her. Walnut's power, "Psycho Burgundy", is the same power utilized by the legendary hero Scarlet the Brave, and is fueled by burning the wielder's soul to create a powerful energy. An alternate universe version of Walnut joins Marona and company as a playable character in "Another Marona", a side story that is exclusive to the Wii and PSP versions of the game. Walnut also makes an appearance in another NIS game, Soul Nomad.