Izuna Uchiha

Izuna was a fair-skinned man with spiky, black hair that had a blue tint to it and was tied in a ponytail. His bangs parted down the centre of his face to frame both sides of it. He wore the standard Uchiha outfit which consisted of a high-collared, blue shirt with the Uchiha crest on his upper back and blue pants which were wrapped up in bandages at the ends. On his waist, he had a bandage belt that held a sack which presumably held ninja tools. As a child, his ponytail was absent, and his hair was spiky in the back, and he wore the standard high-collared robes worn by other Uchiha of the Era of the Warring States with the Uchiha crest on the back, with an armoured chest plate. According to Hashirama Senju, Izuna bore a striking resemblance to one of his clansmen, Sasuke Uchiha.

Before the era of ninja villages, Izuna was one of the five sons born to Tajima Uchiha. However, three of his brothers died at the hands of the Senju, leaving the second eldest Izuna and his oldest brother Madara. Alongside Madara, Izuna was considered one of the most gifted members of the Uchiha. Izuna often competed with his brother as training. As a child growing up during the war-torn era, Izuna once accompanied his father on a mission to kill Hashirama Senju, whom Madara — albeit unknowingly — had been meeting. Once there, Izuna and his father were confronted by Butsuma and Tobirama Senju, the latter of whom he acknowledged by name. As Izuna clashed with Tobirama, unbeknownst to him, Butsuma had launched an attack at him, hoping to strike him down and gain an advantage at defeating the evenly-matched Tajima. This attack, however, was deflected by his brother Madara who had intervened between the two sides along with Hashirama. Izuna later showed shock when Madara noted that Hashirama was stronger than he was, but was later elated to see that his brother had awakened his Sharingan. As the battles between the two clans raged on, Izuna awakened his own Sharingan and became one of the first two Uchiha to awaken the Mangekyō Sharingan, alongside his older brother. With their newly obtained power, the two brothers became the heads of the clan, with Madara becoming its leader. During a battle with Tobirama, Izuna was mortally wounded by Tobirama's technique. With Madara quickly rushing to Izuna's aid, Hashirama pleaded with Madara to come to peaceful terms. Seeing his brother begin to consider this offer, Izuna told his brother not to listen to their lies, ultimately making Madara retreat with Izuna. When Madara later returned to the battlefield, he revealed that the injury inflicted on Izuna was fatal. At the last moments of his life, the dying Izuna had given Madara his eyes so his brother could obtain the Eternal Mangekyō Sharingan to protect their clan from its growing number of enemies and the Senju. Because of the blindness caused by overuse of a Mangekyō Sharingan, many people came to believe that Madara took Izuna's eyes by force to regain his sight.