In the world of the Naruto series, the Sharingan is one of the legendary abilities passed down through the Uchiha clan. The Mangekyou Sharingan is a higher-level form of the Sharingan, often referred to as “the eye that can perceive the truth of all things.”
However, each individual’s Mangekyou Sharingan exhibits unique forms and powers; no two are exactly alike. This is why each Mangekyou Sharingan has a distinct aura that is never fully explained within the story.
What could be the underlying reasons for this?
1. Genetic Heritage May Play a Role in the Strength of Mangekyou Sharingan in Naruto

Unlike the regular Sharingan, the Mangekyou Sharingan varies among individuals, leading to differing abilities and manifestations. The unique strength of each Mangekyou Sharingan is often linked to the genetic background of its wielder.
For example, one of the two abilities of Sasuke and Itachi’s Mangekyou Sharingan is similar, which is the ability to create black flames known as Amaterasu.
However, this phenomenon can only be confirmed if we fully understand the unique powers of the Mangekyou Sharingan of Uchiha Fugaku and Uchiha Sarada. If both were to inherit a certain technique from the likes of Sasuke or Itachi, then this theory might hold true.
2. Potential Traumas Can Affect the Activation of Mangekyou Sharingan
This is also a theory regarding the Mangekyou Sharingan that is quite intriguing, suggesting that moments of deep emotional pain can significantly impact the strength of the eye’s abilities.

Obito’s late arrival to help Rin and Kakashi when his Kamui ability activated demonstrates how a traumatic event can lead to the rapid development of his powers. The only Mangekyou Sharingan that corresponds to this theory is that of Uchiha Obito.
3. The User’s Pre-existing Skills Can Influence the Activation of Mangekyou Sharingan in Naruto
Itachi was a highly skilled ninja whose mastery of techniques with the Sharingan made his Mangekyou Sharingan abilities, particularly Tsukuyomi, incredibly powerful.

Sasuke and Itachi are both ninjas who utilize their innate abilities to the fullest, making their Mangekyou Sharingan powers centered around Amaterasu—the black flames that can burn continuously for seven days and nights even if the target has already turned to ash.
The innate talent and potential of a Uchiha clan member can also influence the strength of the Mangekyou Sharingan, making their abilities significantly more powerful.