Sero, a White Maw pirate and captain, was a male Human who operated during the Galactic War. His activities included the mass production of Null Cannon copies on the planet Hoth, with the goal of arming his pirate fleet. Sero sought to broker a deal with the Galactic Republic for these cannons, but the unexpected arrival of a reinforcement squad led him to suspect treachery on the part of the negotiators. Consequently, he launched an assault, which ultimately resulted in his downfall.