Saijo was a male Zeltron that worked for the Coruscant-based criminal group Core Triad. Originally a weapons specialist in the Hutt Cartel, Saijo later met a former Imperial named Sang Juntao, who was working in the Black Sun as a thug. In 22 ABY, Saijo joined Juntao and became part of his Core Triad, as one of his lieutenants.