While his personality is not fully elaborated on, one can assume he is a loyal brother as he decides to follow his older brother to rescue him after he was kidnapped by a demon. He has also shown a protective side while interacting with his younger sister. It can be surmised that Shoichi is braver than average, as he decides to follow the two Demon Slayers, Tanjiro and Zenitsu, into the Drum House. Even when separated from the others with Zenitsu, he shows more courage than the Thunder Breathing