Fukuzawa is (as expected from the director of a Detective Agency) a very serious and shrewd person, able to maintain his cool even in the face of danger. He is also a good leader. Fukuzawa is a tall, mature man with a perpetually stern expression on his face. He has silver hair and gray eyes. Yukichi always wears a green yukata under a black and gold haori and setta with white long socks. Fukuzawa was the government's strongest swordsman assassin, where he earned the nickname " Silver Wolf ".