One common theme is Naruto's struggle for acceptance. Since he's neglected, he has to fight to be recognized. Another theme could be the power of the Mangekyou and how Naruto discovers and masters it in the face of neglect. Also, there might be themes of revenge against those who neglected him.
Common themes in such fanfics include Naruto's self - discovery. Because he's been neglected, he may not fully understand his own capabilities, especially when it comes to the Mangekyou. Redemption is also a theme that might come up. Naruto could seek to redeem those who neglected him or himself in the eyes of others. Additionally, the exploration of the dark side of being neglected, such as feelings of anger and resentment, which can be intertwined with the power of the Mangekyou, is often seen in these fanfics.
I'm not sure of a specific 'neglected naruto mangekyou fanfic' off the top of my head. But you can try searching on fanfic platforms like Fanfiction.net or Archive of Our Own. Just type in 'neglected naruto mangekyou' in the search bar and browse through the results.
One common theme is isolation. Naruto would feel alone and isolated from his family, which could be a central part of the story. Another theme is self - worth. He'd constantly be struggling to find his value when his family doesn't seem to care. Resilience is also a theme. Despite the neglect, Naruto has to find a way to keep going and become strong. There might also be a theme of revenge in some cases, where Naruto wants to prove his family wrong or make them regret their neglect.
One common theme is the exploration of the power's origin. Many fanfictions try to explain how the Mangekyou Sharingan really came to be. Another theme is the cost of using the Mangekyou. Writers often show that the power comes with a price, like the user's eyesight deteriorating or some kind of emotional toll.
Another common theme is redemption. Sometimes, a character with the eternal mangekyou has made mistakes in the past. Fanfictions might use this power as a means for the character to atone for their sins and become a better person within the Naruto universe. It could be through using their power to protect the innocent or make up for past wrongs.
Power. The eternal mangekyou sharingan represents a great power in the Naruto world, so many fanfics focus on how characters use or struggle with this power.
In 'neglected harry fanfic', the theme of hidden potential is quite common. When neglected, Harry has the opportunity to explore his abilities that were previously unnoticed. Also, the theme of outsider - ness is prevalent. He doesn't fit in with the normal expectations of the wizarding world, and this makes him an outcast. This can lead to him forming new and unexpected alliances with other marginalized characters in the wizarding world.
Self - discovery is also a theme. When Hermione is neglected, she has to re - evaluate herself and her place in the wizarding world. She might discover new powers or talents that she didn't know she had before. In some fanfics, this leads to her becoming a much more self - reliant and confident character.
One common theme is redemption. Naruto gets a chance to overcome his past of neglect and grow into a stronger and more confident person. Another theme is the power of family. The adopted family often provides the love and support Naruto missed out on, which helps him in his journey.
One common theme is revenge. Since Naruto has been neglected, he might seek revenge on those who wronged him. Another theme is self - discovery. With his new god - like powers, he has to figure out who he really is.
One great Mangekyou Naruto fanfic is 'The Redemption of the Uchiha'. It delves deep into the power of the Mangekyou Sharingan and how it affects Naruto's journey. The story has some really interesting character developments, especially for Sasuke who has the Mangekyou. Another one is 'Mangekyou's Secret', which focuses on the hidden abilities of the Mangekyou and how Naruto discovers them in a series of adventures.