Morley is a very hairy and portly giant. She has a Fu Manchu mustache and a shaggy chinstrap beard.
She wears very little clothing, only wearing a short plaid skirt in addition to belts around her arms, a flower symbol on her left forearm, dark gloves, a dark bowler hat with frilly goggles on it, and a weapons pack. Belo Betty describes her as looking like a "potato giant".
As a newkama, Morley speaks in a very polite and feminine manner. She usually has a very jovial attitude and dislikes those who are unnecessarily violent. When she sees people paying attention to her, she constantly wonders if it is because they have a crush on her, not knowing why they would do so otherwise. However, she does not seem too fond of others being attracted to her, having been grossed out when Betty jokingly implied that the men of the Peachbeard Pirates had a crush on her.
As a giant, Morley possesses tremendous physical strength and a longer lifespan when compared to humans. Because of her size, she is able to move very large sections of the ground with her Devil Fruit power.
Morley wields a large harpoon-trident hybrid, which she uses in conjunction with her Devil Fruit power to move the ground.
Morley ate the Oshi Oshi no Mi, a Paramecia-type Devil Fruit that allows her to push and mold the ground as if it were made of clay. Using this power, she can easily move underground, as well as attack enemies by pushing clumps of ground onto them, as it seems to otherwise maintain its original weight and hardness.
Over 100 years before the start of the story, Morley was a wanted pirate who was imprisoned at Impel Down. Using her Devil Fruit, she managed to escape the prison, a fact that remained unknown for a long time, allowing the prison to keep its status as being unbreakable until Shiki's escape many years later. The tunnels Morley carved with her Devil Fruit abilities would later be known as the Level 5.5, which housed the Newkama Land. At some point after this, she joined the Revolutionary Army.