It is said that he created strict rules for Shinsen-gumi, such as Jinchu Hatto and Kyokuchu Hatto, and mercilessly killed betrayers or those who did not follow the rules; he was referred to as the pitiless vice commander, and in general, he was considered to be a heartless person.
陣中法度、局中法度などの厳しい隊規を考案したとされ、裏切り者やはみ出し者に容赦の無い刃を浴びせた歳三は、鬼の副長と呼ばれ普段は冷酷な人物とされる。