Madara Uchiha was the 1st Uchiha as well as the 1st person to ever use the Sharingan and achieve the level of Mangekyou Sharingan.
Known Sharingan Users (that remain alive): Itachi Uchiha, Sasuke Uchiha, Obito Uchiha and Kakashi Hatake.
Sharingan: A blood line power or limit only obtained through blood relation (family),known as the "Copy Wheel Eye" or the "Mirror Wheel Eye" who ever posesses the Sharingan his/her vision dramatically sharpens allowing the user to see even the most insignificant details there for the user is able to immitate or copy his/her opponent's (movements,speech,writingjutsu and so on) thus the name Sharingan,the appe