Shosho was a chieftain of the Banchiian people. He resided on the planet Banchii during the time of the High Republic. To safeguard his homeworld from the threat of the Nihil pirate group, Shosho joined forces with Jedi Master Sav Malagán and the droid ZZ-10 on a mission. This mission took them to the moon Astenban, with the aim of preventing the Nihil from establishing a base there, which they could use to launch attacks. During his time on Astenban, the Banchiian crossed paths with Nihil forces led by the scientist Niv Drendow Apruk and formed a bond with the Force-sensitive being Zimtok. When the Nihil captured his newfound friend, Shosho secretly boarded their ship to attempt a rescue. Upon their return to Banchii, Malagán and ZZ-10 shared the details of Shosho's actions with Jedi Knight Lily Tora-Asi. In response, the Knight requested that the Master undertake a rescue mission for Shosho, assuring Shosho's fellow Banchiian people that Malagán, accompanied by Jedi Master Arkoff, would locate and return Shosho safely to Banchii.