Katsu grew up an orphan on the streets of Hong Kong. He learned to fend for himself. He found that everyone else was either prey, or a predator like him. At age nine he was caught trying to pick the pocket of a man in the street. The man turned out to be a high ranking member of Fujin's Blood, who recognized Katsu's cunning and talent, he knew with training and discipline, he could become a great asset to the Fujin.
Fifteen years later, Katsu is a strong, determined, if not short tempered member of Fujin's Blood. He has proven himself time and time again, though the elders have still not seen fit to grant him a spirit. A source of endless frustration to him. When he's not on a mission, he can usually be found training or watching western action movies.