The Second Hokage was the younger brother of the First Hokage and a key figure in founding Konohagakure alongside his brother and Madara Uchiha. As a member of the Senju Clan, he helped build the village from the ground up into what it became. He later trained the Third Hokage, passing down his knowledge to the next generation.
He's best known for his mastery of water jutsu—widely considered the greatest of his time. What made him stand out was his ability to create water from nothing, which meant he could perform any water technique without needing an external source. This gave him a significant edge in combat and made him a formidable shinobi.
He was also Tsunade's great-uncle, connecting him to one of the village's most important medical ninjas down the line.
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