Roku Kage

Roku Kage is a Kami and formally a partner and close friend of Shikyo Fushiawase and a member of The Hand. During Shikyo's, Higamoppi Fushiawase's, Zentaitoshitenkushimi Sonodeddo Banbutsunoriechou's, an Burikka Hakumei Akegata's betrayal of the Soul Society 1,000+ years before the start of the series he teamed up with them, but was captured and imprisoned by the Central 46 in Muken. The sentence he was given was 10,000 years, but was broken out when his three partners returned to the Soul Society. While he wasn't offically a balancer 1,000 years ago, he was one of the few Shinigami who did frequently fight alongside them.

Zanpakuto
The name of Roku Kage's Zanpakuto is Takamari no Teikoku (高まり帝国神璽 lit. Rise of the Imperial Regalia).

Bankai
The name of Roku Kage's Bankai is Hagyou no Teikoku Shinji (覇業帝国神璽 lit. Domination of the Imperial Regalia).