Izuna Uchiha

Izuna Uchiha was a powerful shinobi from the Uchiha clan, Madara Uchiha's younger brother, and a key figure in the era before the ninja villages. He was renowned as one of the Uchiha's strongest members, rivaling his brother, and was the first Uchiha to awaken the Eternal Mangekyo Sharingan alongside Madara. His death at the hands of Tobirama Senju led to Madara's descent into darkness, and Izuna's eyes were given to Madara, allowing him to achieve the Eternal Mangekyo Sharingan.