Jiro was a Weequay with a mohawk hairstyle and was handy with a blaster. In 20 BBY, he raided a cargo ship, the ALC-9, that contained Sith LordsDarth Maul and Savage Opress. As Jiro and his men were searching the ship for valuable goods, the brothers revealed themselves, Force-choking Jiro. The Sith then told Jiro to betray Hondo Ohnaka and help them form an army, promising that they would not kill him and that he would be well-rewarded. Jiro agreed, and Maul explained to Ohnaka that three of his lieutenants had defected against him, along with others that Jiro himself recruited.
Subsequently, Jiro and the pirates who had followed him engaged Ohnaka's forces in an attack on his former superior's base. However, Ohnaka was able to sway the loyalties of Jiro and the other pirates once more, after which recombined pirate army pursued Maul and Opress, though the brothers managed to escape with critical injuries.