Marble is a thin woman with pink wavy hair. As a half-longarm, she possesses two joints in her arms. She wears a low-cut yellow top, vertically striped puffy pants, boots, and a sailor's cap, as well as gloves on her hands.
As an officer of the Big Mom Pirates, Marble has authority over lower-ranking members of her crew. Her combat powers and abilities are unknown besides those native to Long-Arms, but she is presumably strong as she is an officer of an Emperor-led crew. She is strong enough to have been sent with many of her siblings to Cacao Island to fight Luffy.
Marble gathered with thousands of her crewmates on Cacao Island as part of Charlotte Oven's effort to ambush Monkey D. Luffy. She was surprised when Pekoms came out of the mirror leading to Cacao Island, but the army eventually discovered Luffy. After Luffy and his crewmate Sanji were overwhelmed, Marble and several crewmates shot at them, but their shots were blocked by the Vinsmoke Family.