Heaven's Eye - Sharingan

The Sharingan (写輪眼; Literally meaning "Copy Wheel Eye") is the Dojutsu Kekkei Genkai of the Uchiha clan that selectively appears in some of its members. This is the one of the Three Great Dojutsu (三大瞳術, San Daidojutsu; Literally meaning "Three Great Eye Techniques"), along with the Byakugan and the Rinnegan. The Sharingan is also called "Heaven's Eye" (天眼, Tengan), because of the many abilities it grants the user.

Sharingan have 3 stages of power. The first of the Sharingan's powers is being able to see chakra flow. The Sharingan itself gives colour to chakra, allowing the wielder to differentiate them. As the Sharingan evolves, gaining more tomoe, this ability extends to being able to track fast-moving objects before finally giving some amount of predictive capabilities to the user, allowing them to see the image of an attacker's next move from the slightest muscle tension in their body and counter-attack or dodge without any wasted movement. The Sharingan's third and most well-known ability is that it grants the user the ability to copy almost any technique that he or she witnesses, apart from other Kekkei Genkai Techniques.

Top to Bottom ( Obito (Sharingan - Rinnengan), Madara (EMS), Itachi (MS), Sasuke (EMS) )

The Sharingan needs to be activated by the user when they are faced with a difficult circumstance or placed under emotional stress. Beside that Sharingan have special upgrade for special user it called Mangekyo Sharingan. The Mangekyo Sharingan is awakened by a Sharingan user when they suffer from trauma after witnessing the death of someone close to them. Every person who get this stage have different power of the eyes, but every person who awakened this Mangkekyo Sharingan, have ability to awake special technique who called Susanno. Like special power of the Mangekyo Sharingan, every Susanno of each person is different.

Obito and Madara Susanno

Sharingan also can be change to Super Powerfull eyes like the Sage of Six Patch eyes who called Rinnengan, but in this case the user of Sharingan need to acquired Hasirama Senju DNA, like the Madara Uchiha do. He acquired Hasirama Senju's DNA during the battle on the Valley of the end with Hasirama. One who possesses the Rinnengan has access to a multitude of abilities, such as the ability to possess and use all six chakra nature transformations and the capacity to use any technique.

Madara Sage Six Path Mode With Rinnengan