|Japanese name:||山本元柳斎 重國|
Yamamoto's zanpakutō is Ryūjin Jakka (流刃若火, roughly "flowing blade like fire", Viz "flowing flame blade"). When released, the sword consumes him and the surrounding area in flames. It is the most powerful zanpakutō in Soul Society, and the sheer power of the flame can disintegrate almost anything the sword is waved at. Yamamoto is an exceedingly powerful fighter, able to easily combat two captains, as well as several arrancar, with Ryūjin Jakka's shikai. He is also a skilled martial artist in hand-to-hand combat; when Ryūjin Jakka's powers are negated by Wonderweiss Margera, Yamamoto proceeds to kill the Arrancar with his bare hands. Ryūjin Jakka is a primary plot element in the anime's "Zanpakutō Rebellion" arc, sought by Muramasa to use for his own purposes. He is voiced by Masaaki Tsukada in Japanese and Bob Johnson in English.