Tsurugi is a 10-year-old kid of average build, if not slightly chubby. Tsurugi's personality is a mix of typical childishness and precocious sinisterness. During his introductory arc, he plays a mean prank on both Yasuho and Josuke by making them unable to differentiate between people through his power Paper Moon King. He eventually apologizes to Yasuho for the distress he's caused to her. Other similar traits are his quick friendship with the dog Iwasuke and his love of making puns.