Sharingan

He later killed his best friend to get his hands on the Mangekyo Sharingan and, after his brother's death, he transplanted his eyes to make his own Mangekyo Sharingan eternal.

Along with Madara, he was the first Uchiha to awaken the powers of the Mangekyo Sharingan, which he did by killing his best friend.

His possession of the Rinnegan and Eternal Mangekyo Sharingan also made him one of the few capable of interpreting the tablet's contents in their entirety.

Itachi had awakened the Mangekyou Sharingan in both his eyes, which allowed him to use the Susanoo.

The Susanoo or God of the Sea and Storms technique is generated by both eyes, and it makes use of the Mangekyou Sharingan form so as to create a sword-wielding specter that will surround the user.

While these powers of the Sharingan make it an overpowered ability on their own, there is more to them that the fans know makes it exceptional.

With two Mangekyo Sharingan, the Kamui was able to make the user intangible at twice the speed.

Itachi can easily beat Deku using his trickeries without having to use his ultimate trump card, the Mangekyo Sharingan.

Anyone who has awakened the Mangekyō Sharingan in both eyes is able to create a giant chakra avatar known as the Susanoo.

After all, we don’t know anything about his past, and his original artwork did seem to indicate an affinity for copying, just like the Uchiha clan’s sharingan.

The Sharingan gives Sasuke's body such an edge that, merely by having it, he's acknowledged as a strong ninja.

The Sharingan lets him hone his own speed and be a faster fighter, making it harder for enemies to track him.

While most of its powers are based on reading others' motions and copying moves, the Sharingan can also create illusions.