Yoriichi is the strongest Demon Slayer to ever exist. Being born with the Slayer Mark, has a physique polished to the highest caliber and innate swordsmanship talent. He is calm and respectful, has a solemn and reserved expression at all times, rarely shows outbreaks of emotion, he has a matching low and serene disposition. Due to his gentle and unchanging facial expression, most couldn't tell what he was feeling: the only person who could read his feelings without difficulty is his wife Host.