What is mangekyu sharingan?

Mangekyu Sharingan is a powerful form of Sharingan that is activated when the user experiences intense emotions, such as overwhelming grief or anger. It provides the user with advanced visual abilities, such as the ability to perceive chakra and track high-speed movement, as well as unique techniques such as Amaterasu and Susanoo.

However, the Mangekyu Sharingan also has serious drawbacks, including vision loss and physical strain on the user's body. Overuse of the Mangekyu Sharingan can lead to permanent blindness and even death.

There are also different variations of the Mangekyu Sharingan, with each user developing their own unique shape and design. Some famous users of the Mangekyu Sharingan include Sasuke Uchiha, Itachi Uchiha, and Madara Uchiha.