It depends on the specific plot and character development in the fanfic. You could be a new ninja with unique skills or a reincarnation of a past character.
Well, if a Senju became the clan head in fanfiction, it could change a lot of things. For one, they could have a different approach to dealing with the Uchiha. Instead of the historical tensions, they might strive for a more harmonious co - existence. Also, they could play a big role in the overall politics of the Hidden Leaf. They could use their influence to improve the village's infrastructure and ninja training programs.
Well, a common trope is the 'Self - Insert'. Fans write themselves into the Naruto universe, interacting with the characters. Then there's the 'Crossover' trope, where Naruto characters meet characters from other universes, like from Bleach or One Piece. The 'Redemption' trope is also popular, where a villain in the Naruto world gets a chance to redeem themselves through some extraordinary circumstances.
In Naruto fanfiction, it depends on the specific story. Sometimes the character's pride might stem from achieving a difficult goal or mastering a powerful jutsu.
The Hyuga clan could also be a possibility. Given their strong bloodline and their focus on family and tradition, they might adopt Naruto. They could teach him their Gentle Fist technique. And Naruto could use his unique energy and determination to perhaps improve or modify the technique in some way. Plus, he could help the Hyuga clan with any external threats they face due to their valuable Byakugan.
In this fanfiction, Naruto could reject his clan because of the dark secrets or past actions of the clan. He is a character who values justice and friendship. If the clan has a history of wrongdoings that he discovers, he may not want to be associated with it. Also, Naruto has his own dreams and goals that might not fit within the framework of the clan. He has always been a bit of a rebel, and rejecting the clan could be his way of standing up for what he believes in.
One possible reason could be to seek greater power and training opportunities elsewhere. Maybe he feels restricted within his clan in terms of the type of jutsu he can learn or the level of training he can receive. So, he decides to leave to explore different ninja arts and grow stronger on his own terms.
Naruto could unlock the full potential of Uzumaki sealing techniques. He has great chakra control, which is essential for these techniques. With his leadership, the clan members could learn more advanced forms of sealing. Also, he might discover some hidden Uzumaki jutsus that were lost over time. His own experience in battle and with different types of chakra could help in this discovery.
One of the Forbidden Clan techniques could be related to the Uchiha Clan's Izanagi. It allows the user to turn illusion into reality for a short time, but at the cost of losing one's eyesight in the eye used. Another might be from the Kaguya Clan, like their bone manipulation abilities which are extremely powerful and unique to their bloodline.
Fanfiction often takes creative liberties with Naruto clan kinjutsus. Writers may create new variations of existing kinjutsus or even invent entirely new ones. This can add an exciting element to the story, especially when these new kinjutsus are used in battles or to solve complex problems within the fan - created plot.