One theme could be the struggle between light and dark within Naruto. He has always been a symbol of hope in the Naruto series, but this fanfiction might show his internal battle with the darker emotions like anger and vengeance.
The theme of isolation might be present. Naruto has had his moments of feeling alone in the series. In this fanfiction, it could be amplified as part of his 'darkness'. Maybe he isolates himself due to some event that makes him question his relationships and his place in the ninja world. Also, the theme of power corruption could be there. Given Naruto's immense power, the fanfiction might explore how that power could corrupt him, especially if he faces difficult situations where the easy way out seems to be using power in a more ruthless way.
One challenge could be controlling the transformations. If he can't master when and how to transform, it could put him in dangerous situations. For example, transforming at the wrong time during a battle could leave him vulnerable.
There are several themes. One could be a training - based theme, where Naruto, Hinata, and Ino train together and in the process, their relationships deepen. Another might be a time - travel theme, where they are sent back in time and have to rely on each other to get back to their own time. Also, a theme of self - discovery could be explored, where through their interactions with each other, they learn more about themselves and their place in the world.
Perhaps he would be a fan of traditional Japanese music. Given his strong connection to his ninja village and Japanese culture in general, it could be a way for him to connect with his roots on a deeper level. In this fanfiction, he could be shown exploring the different instruments like the shamisen or the koto, and the various melodies that have been passed down through generations.
One common theme is the struggle between light and dark. Naruto, who is often associated with the light, has to face the 'Angel of Darkness' which represents the opposite. Another theme could be redemption. Maybe the 'Angel of Darkness' has a chance at redemption through Naruto's influence.
He could have a summon - like animal as a pet. For example, a toad that he befriends and keeps as a pet instead of just using for summons in battles.
Anko could be obsessed with fanfiction that gives her more power or a different role in the Naruto universe. For example, fanfiction where she becomes a key figure in a major battle or a leader in the Hidden Leaf Village. It could also be fanfiction that pairs her with other characters in unexpected relationships, like a friendship with Hinata or a rivalry with Kakashi.
It's really hard to say without actually seeing such a fanfiction. But perhaps it could be related to Naruto getting into some sort of difficult situation, like a magical or physical knot that he has to overcome, and the story could revolve around his journey to untie it, both literally and metaphorically.
The theme of redemption might be present. Characters who have dabbled in the power of darkness may seek to redeem themselves. This could involve a complex journey of self - discovery and atonement. They might have to face the consequences of their actions while trying to find a way back to the side of good. Another aspect could be the exploration of the origin of dark power in the Naruto world. Maybe it's an ancient force that has been forgotten or something new that emerged due to certain events in the fanfiction's plot.
One common theme could be the struggle between Naruto's light - filled past self and the new, dark - influenced self. In many yaoi fanfictions, there might be a relationship that either causes or is affected by this descent into darkness. For example, a relationship with another male character where power dynamics, jealousy, or a need for acceptance play a role in Naruto's change.
One common theme is the struggle against darkness. In both Naruto and Kingdom Hearts, darkness is a significant element. So in these fanfictions, characters often have to battle their inner demons or external dark forces. For example, Naruto might have to face the darkness within himself in the context of the Kingdom Hearts world.