Ōetsu Nimaiya

is a member of the Royal Guard.

Appearance
Ōetsu is a dark-skinned man with thick, black hair that is shaven and dyed green in color on the left-side of his head. He wears a variation of the Shinigami shihakushō, featuring instead a green undergarment and a shortened hakama that exposes his lower legs. Worn over this is a white, sleeveless puffer jacket that bears the Royal Guard emblem on its back, as well as the alternating circle and diamond pattern of a captain's haori along the bottom. His attire is completed by gold-framed sunglasses with blue lenses, and a pair of green slippers that are gold trimmed and have a shoe-like appearance.

Personality
According to Kirio Hikifune, he's an unpredictable man.

History
Ōetsu is credited with having created the Zanpakutō, something that even the Soul King recognized as a significant contribution to Soul Society; hence his promotion to the Royal Guard.

The Thousand-Year Blood War arc
After the death of Genryūsai Shigekuni Yamamoto, he comes to Soul Society with the other members of the Royal Guard, where they are greeted by the surviving Gotei 13 captains and Ichigo Kurosaki. He remains silent throughout the encounter and they return to the Royal Palace with Ichigo and the injured Byakuya Kuchiki, Renji Abarai and Rukia Kuchiki.

Zanpakutō

 * Shikai: Not Yet Revealed
 * Bankai: Not Yet Revealed