Izuna Uchiha was a harmonic and devoted person. He also appeared to be very competitive with his brother, Madara, in terms of skill as they would often spar with one another in an attempt to hone these skills. Izuna looked up to Madara greatly. As he grew older, Izuna's love for his clan grew and he fought fiercely to protect it. Because of the Sharingan's ability to see past any attempt to blind the user, Izuna felt pity for those who did not possess one, viewing it as a curse.