Chief Joko was a male Cyphari native to the planet Cyphar who was the leader of the Afe clan. The clan had a dispute with the human colonists who were raiding in the Afe territory. The real reason was this territory was full of spice called scarn. Thrawn ambushed and captured the raiders including their leaders. And ordered his TIE fighters and the Thunder Wasp to orbitally bombard the disputed land. Thrawn's actions angered Joko.