 Compared to his female partner Ayame, Rikimaru's design did not change much through the series, with exception of the first sequel which featured the younger version of him and with no scar.Rikimaru is the current head of the Azuma Shinobi Ninja Clan and the series' primary protagonist.His master and predecessor as head of the clan was Shiunsai, who was killed by another member of the clan, Tatsumaru.