Koganehiko and Shiroganehiko

The two dress almost identically, each in a red cap trimmed with gold and topped by a white tassel, with a pale blue scarf fastened at the throat by a red-and-gold clasp. Their garments are told apart chiefly by color, Koganehiko in yellow and Shiroganehiko in white, as are their faces: Koganehiko has a broad face and a cleft chin, while Shiroganehiko's is longer with an ordinary one.

Both are steadfastly devoted to the Shiba Clan and those it favors, and they are crushed by the slightest hint of disappointment from Kūkaku or Ganju Shiba. Tireless and uncomplaining, they carry out whatever Kūkaku assigns them flawlessly and without a word of resistance.

The pair have guarded the Shiba house for generations, so long that they knew Yoruichi Shihōin on sight in her cat form despite her hundred-year absence from Soul Society. Before the clan's decline they served as tutors to Kūkaku and Kaien Shiba, and once the family fell from grace they alone stayed on to serve it.

When Ichigo Kurosaki's group reached Kūkaku's home, the two barred the way until they recognized Yoruichi and ushered the visitors inside. They raised the platform beneath the cannon-like tower, presented the Kakaku Taihō, and were charged with drilling the group in the Reishukaku technique needed to breach the Seireitei, scolding Ichigo when he alone could not grasp it. As the travelers prepared to launch toward the Seireitei, both guards waited by the cannon, and Ganju's account of his late brother moved them to tears.