Sasuke awaken his sharingan in episode #141, titled “truth. ”. How did kakashi get his sharingan? Obito gave it to him while he lay dying during a mission.
Sasuke had the kekkei genkai that he inherited when he reached the age of 18 and got his sharingan. But how did sasuke get mangekyou sharingan? A dedicated professional that dedicates her time to help other people or to love and support her family.
Yeah she isn't as powerful as naruto/sasuke, like 99% of the characters. She is still a top kunoichi. Before itachi’s death, sasuke could show a powerful genjutsu to his enemies with his sharingan, and before he defeated itachi and killed him, itachi transfered his power to sasuke.
And then sasuke learnes the truth about why itachi betrayed the hidden leaf villiage, and then he gets mad and sad, and then sasuke awkens his mangekyo. Being a member of the prestigious uchiha clan, sasuke was able to obtain his clan’s kekkei genkai, the sharingan, during his growth. The first time he woke up was at the age of 7, with a cross in each eye, after experiencing the massacre of his clan caused by itachi, however, due to the trauma caused, sasuke was not able to wake him up again.
Shippuden’ sasuke is pushed to leave the hidden leaf to grow strong enough to defeat his brother itachi and avenge the whole uchiha clan. Seeking to grow his strength as a shinobi, but also an uchiha, sasuke sought out the taboo training of orochimaru. This behaviour led to his exile from the village and ultimately earning him.
After knowing the dark truth about the uchiha massacre, itachi’s sacrifice for the village and love for his younger brother, sasuke gets his mangekyou sharingan. Later, he went to kill danzo for that. After danzo’s death, he wanted to destroy the hidden leaf village, as the hatred took over his senses.
So, this explains how did sasuke get. Simply that event wasn’t as traumatic due to his age. Sasuke was barely 7 when the incident happened and a child that small isn’t able to understand the gravity of the event.
Even then it does affect him on the long run. When tobi told sasuke about the truth of itachi uchiha. The realization of his brother protecting him this whole time activated his mangekyo due to.
What chapter does sasuke get the mangekyou sharingan? Risk of mangekyou sharingan. Although the mangekyou sharingan is powerful, it comes at a risk:
As long as you have your eyes activated into that form, it will become painful for you to keep them open.
