Fuzen is extremely anti-social and will only speak when absolutely necessary. However, Fuzen is not shy. He just does not like attention.
Fuzen also has trouble trusting others and has trouble understanding emotions such as love, happiness, etc. Most of emotions are exaggerated with greed and hate.
Fuzen aslo does not respond to hate or sadness. He keeps his cool always. Harsh words mean nothing to Fuzen.
In other words, if he were to brutally harm someone or if someone was brutally harmed he would most likely walk away or laugh instead of coming to there aid.