Hirata was Sano Ichirō's chief retainer.
- Midori: Hirata fell in love with Midori during the Concubine's Tattoo case. They married about a year afterwards.
- Hirata is the name of the clan that he belongs to. Hirata's first name has never been stated.
|Sano clan||Sano Ichirō • Reiko • Masahiro • Akiko • Etsuko • Sano Shutarō|
|Yangisawa clan||Yanagisawa Yoshiyasu • Lady Yanagisawa • Yoritomo • Kikuko • Yoshisato|
|Hirata clan||Hirata • Midori • Taeko • Tatsuo • Chiyoko|
|Tokugawa clan||Tokugawa Tsunayoshi • Ienobu|
|Niu clan||Niu Masamune • Lady Niu • Niu Masahito • Niu Yukiko|