Z is a large, muscular, tan-skinned man, standing around twice the height of a typical man such as Luffy, with short purple hair and a large mechanical right arm connected to the left hip with converted mast rigging.
Underneath that mechanical arm is a regular-sized and pitch black prosthetic arm.
He dressed in a Marine-like coat with his Jolly Roger impressed on it, baggy trousers tucked into his boots, and a pair of triangular sunglasses.
He suffered from breathing problems due to his age, requiring the need of an aerosol.
As a Marine admiral, his standard outfit consisted of a purple suit with a Marine coat draped over his shoulders like a cape, his arms not in its sleeves.
Z also wore a pink shirt with a polka-dotted tie under his purple suit.
At age 28, Z kept his marine coat draped over his shoulders and wore a white V-neck shirt with the marine logo printed on it.
During his time as a young man at the G-5 unit, Z was smaller and less muscular and wore a standard low ranking marine's uniform, consisting of a white short-sleeved shirt emblazoned with the Marine emblem, a simplified seagull with "MARINE" underneath it, on the back; a blue neckerchief; dark blue trousers; and a baseball cap with "MARINE" across the front. When he was a child, Z played the role of his hero, Z.
He wore a red helmet on his head with the "Z" letter placed in front, as well as big glasses.
He wore a sleeveless yellow shirt, light blue shorts, brown boots and white gloves.
He also carried a wooden sword and he had a wooden prosthesis attached on his right arm.
Z believed deeply in justice and heroism, having joined the Marines simply to fulfill both desires, and resigning eventually when he realized the organization was not as just as he had hoped.