The most interesting thing about Soujiro is that he has no emotions other than contentment. No matter what the situation, he always wears the same pleasant smile. Even when killing. This lack of emotions makes him impossible to anticipate. Even Kenshin could not defeat Soujiro until his emotions came back. However, it is not that he doesn't *have* emotions. Rather, he has suppressed them...

                     Soujiro's mother was a prostitute and had him with a man who happned to own a rice distribution company. Not to make a scene, the man's family adopted Soujiro when he was a child. Whether this was before or after Soujiro's real father died I do not know. What happened to his mother is also unknown.

                     Soujiro was treated *terribly* by this family. They worked him like an animal and beat him constantly. However, he learned to smile whenever they hurt him, because when he smiled they got tired of beating him and quit. This is where he started to suppress his emotions.

                     One night Soujiro sees a bandaged man killing a police officer. He tries to remain quiet but breaks a branch behind him trying to hide. Shi-Shi-O hears the twig snap and says he has to kill Soujiro because he saw him. Soujiro, of course, is very frightened. Shi-Shi-O is about to kill him and Soujiro starts smiles like a maniac. Shi-shi-o then asks him...