Morley is a very hairy and portly giant. He has a Fu Manchu mustache and a shaggy chinstrap beard.
He wears very little clothing, only wearing a short plaid skirt in addition to belts around his arms, a flower symbol on his left forearm, dark gloves, a dark bowler hat with frilly goggles on it, and a weapons pack. Belo Betty describes him as looking like a "potato giant".
As an okama, Morley speaks in a very polite and feminine manner. He usually has a very jovial attitude and dislikes those who are unnecessarily violent. When he sees people paying attention to him, he constantly wonders if it is because they have a crush on him, not knowing why they would do so otherwise. However, he does not seem too fond of others being attracted to him, having been grossed out when Betty jokingly implied that the men of the Pinkbeard Pirates had a crush on him.
As a giant, Morley possesses tremendous physical strength and a longer lifespan when compared to humans. Because of his size, he is able to move very large sections of the ground with his Devil Fruit power.
Morley ate the Oshi Oshi no Mi, a Paramecia-type Devil Fruit that allows him to push away any substance. Using this power, he 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 his devil fruit, he 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 his Devil Fruit abilities would later be known as the Level 5.5, which housed the Newkama Land. At some point after this, he joined the Revolutionary Army.