Urushi is an orphaned child who lived in the Konoha Orphanage. He later became a shinobi of Konohagakure. At some point in time, Urushi along with some other children and Nonō from an orphanage, found a young boy under a tree wounded. After she had healed him, Urushi assisted the young boy in getting back to the orphanage with them. The next day, he stated that it was odd for someone to have no name, and as such the nun decided to call him Kabuto after the helmet Urushi put on Kabuto's head. Over the years, as the orphans aided Nonō and Kabuto in treating some Konohagakure shinobi, Urushi protested having to help ninja, but understood that they needed the money and dutifully helped them. (Source: Narutopedia)