Kagetoki Kajiwara

Chi no Byakko (地の白虎 Byakko of Earth). Showy and frivolous, the army magistrate and a military commander of the Genji. Confidant of Kurō's older brother, Minamoto no Yoritomo. Although a soldier, Kagetoki also uses a gun-like tool to effect Onmyōji arts. He appears to be showing off, but he is careful and attentive to people's relationships. He is the thoughtful and protective older brother of Kajiwara Saku, the Kokuryū no Miko (黒龍の神子 Priestess of the Black Dragon?). He is based on the historical Kajiwara Kagetoki.

Source. Wikipedia