Gyro is a master of the Spin and an executioner hailing from the Kingdom of Naples. He joins the Steel Ball Run race to win amnesty for a child he is assigned to execute. Gyro's signature weapons are his special Steel Balls that produce and manipulate the Spin - the mastery of which later allows him access to the senescence-inducing Stand Ball Breaker.

Gyro is a man of average to above-average height and medium to athletic build. He has long hair that reaches mid-back, light-colored eyes, and square patches of facial hair lining his jaw, four on each side. He either wears grills or has chiseled into prosthetic teeth the phrase "GO! GO! ZEPPELI".

Throughout the Steel Ball Run race, Gyro wears a variety of outfits to suit the weather of the current location. However, they all maintain the same key elements and motifs of his wide-brimmed hat and slit goggles, a dark shirt studded with miniature steel balls, a cape wrapped around his shoulders that splits into three segments, and his large belt with special holsters for his two Steel Balls.