Nijūmaru Yamanaka (山中二重丸, Yamanaka Nijūmaru) is a Jōnin from Konohagakure, who fought in the Third Great Shinobi World War when he was ten years old. He is a well respected ninja in the village, and has a twin brother named Shokujin. He is a famous Yamanaka in that he has completely mastered his water nature chakra; being able to combine it with his fire nature to make Boil Release and has also combine his lightning and wind natures to form Swift Release.