Gyro Zeppeli(ジャイロ・ツェペリJairo Tseperi), born Julius Caesar Zeppeli(ユーリウス・カイザー・ツェペリYūriusu Kaizā Tseperi) is the deuteragonist of Steel Ball Run. Gyro is a master of the Spin, applied with his Steel Balls, developed in the service of the King of Naples. He joins the Steel Ball Run race to win amnesty for a child he is assigned to execute. He is the dimensional counterpart of both Will A. Zeppeli and his grandson Caesar A. Zeppeli.