Possible Clues:

• Japanese martial arts practitioner
• Literally, ''stealthy person''
• Japanese martial-arts warrior
• Japanese combatant seen in jazzy trousers
• Martial art expert in town in Japan
• Fighter seen in Japanese clothes
• One might assassinate knight in German agreement
• Mercenary or covert agent in feudal Japan
• Japanese spy
• Japanese assassin held in Benin jail