Ketsu Onyo was a human female Mandalorian from Shukut who worked as a bounty hunter in the employ of Black Sun in the years prior to the Battle of Yavin. She was a friend of Sabine Wren and helped the cadet escape from the Imperial Academy on Mandalore. The two became bounty hunting partners before she and Wren parted on bad terms, and Wren joined the Spectres. After leaving Sabine for dead, Ketsu joined Black Sun.