Genshirou Okikiba

Genshirō Okikiba (沖牙 源志郎, Okikiba Genshirō) is the 3rd Seat of the 1st Division in the Gotei 13 under Captain-Commander Genryūsai Shigekuni Yamamoto. As the Vandenreich attack Soul Society, Genshirō is in Yamamoto's office. Yamamoto states that he is leaving and orders Genshirō to stay and protect the 1st Division's barracks.

(Source: Bleach Wikia)