In the Naruto series, Tobi, also known as Obito Uchiha, plays a significant role in the Uchiha clan massacre and later on in the battle with Konan. One of the key factors that allow Tobi to have two Sharingan eyes is his involvement in the massacre itself and his collection of Sharingan eyes from the deceased Uchiha clan members.
Tobi, alongside Itachi Uchiha, orchestrated the Uchiha clan massacre in order to prevent a coup d’etat against Konohagakure, the village hidden in the leaves. During this tragic event, Tobi collected several Sharingan eyes from the Uchiha clan members who fell victim to the massacre. It is believed that he implanted one of these Sharingan eyes into his left eye socket, replacing his original eye.
The Sharingan is a special eye technique unique to the Uchiha clan. It grants the user enhanced visual perception, the ability to see chakra, and even copy and predict their opponent’s movements. By implanting a Sharingan eye, Tobi gained access to these powerful abilities, making him an even more formidable opponent.
However, Tobi’s possession of two Sharingan eyes goes beyond just implanting one eye. After the events of the Uchiha clan massacre, Tobi encountered Nagato, a fellow Uchiha and member of the Akatsuki organization. Nagato possessed the Rinnegan, a legendary eye technique that surpasses the Sharingan. Tobi convinced Nagato to join forces with him, and together, they worked towards their shared goals.
Nagato eventually sacrificed his life to revive the lives of those who died in the destruction of Konoha. Tobi, desperate to carry on Nagato’s legacy and achieve their shared dream, used the power of the Rinnegan to implant Nagato’s eyes into his own body. This granted Tobi the ability to utilize both the Sharingan and the Rinnegan simultaneously.
With the Rinnegan, Tobi gained even more powerful abilities, such as the ability to control the Six Paths of Pain and access the legendary technique known as the Infinite Tsukuyomi. By combining the Sharingan and the Rinnegan, Tobi became an incredibly formidable opponent, capable of executing complex and devastating techniques.
In conclusion, Tobi’s possession of two Sharingan eyes is a result of his involvement in the Uchiha clan massacre, where he collected Sharingan eyes from the deceased Uchiha clan members. He implanted one of these eyes in his left eye socket, replacing his original eye. Additionally, he later acquired the Rinnegan by implanting Nagato’s eyes into his body, further enhancing his visual prowess and granting him even more powerful abilities.