As the Captain-Commander of the Gotei 13, Yamamoto is highly respected by most of the Shinigami, most notably Sajin Komamura, who views Yamamoto as a benefactor who saved his life. The embodiment of conviction, Yamamoto follows the laws and regulations of Soul Society to the letter, and expects the same of others. He is not a man to tolerate insubordination, and is vocal with those who attempt to act in such a manner. He is quick to anger in the face of possible betrayal and can be quite aggressive in combat. He has a habit of referring to those he faces in battle as "youngster", and he refers to a battle as a "beating" or "punishment". When in a state of peace, he carries himself with an air of frailty, to the point where he fell asleep standing while awaiting Shunsui Kyōraku's arrival for a meeting. Due to years of experience, Yamamoto very rarely shows any sign of distress or surprise, usually responding by opening one or both of his eyes, which are partially closed slits for the majority of the time.