Possible Clues:

• 'Teenage Mutant ___ Turtles'
• What conceals man in Japan, and vice versa
• Martial art expert in Shotokan, in Japan
• Assassin seen in Salisbury Plain in Jane's last work
• Ancient mercenary
• Popular Halloween costume
• Teenage turtle of comics
• One of van Lustbader's was white
• Mercenary Japanese erotic writer has Freud's positive support
• Trained assassin