Marlene serves as the mechanic aboard the Venus, a spacecraft commanded by Eris. She has brown eyes and orange hair tied in twin tails, which she accessorizes with a black hat and a pink hair ribbon. Her outfit is a black top and shorts with pink accents, featuring an exposed midsection, and she wears a pink necklace.

As the youngest of ten children, Marlene found it historically difficult to obtain powerful Battle Spirits cards, as her older siblings claimed all the desirable ones. This led to her personal history of finding the game challenging.

She demonstrated a supportive and well-meaning, if sometimes blunt, aspect of her personality by assisting Rikuto April with his deck. This was done through a trade where she provided him with a Nijinoko card and received The FlameDragonDevil Ma-Gwo in return. She also holds a strong admiration for Eris.

In gameplay, she prefers Yellow and Red colored decks. Known cards she utilizes include The Angelia Kleio, The Angelia Liyuiel, and the X-Rare card The KatanaHero Musashied-Ashliger. Her documented battle outcomes include a victory against Rikuto and another win against an unnamed opponent.