Perhaps there is an ancient artifact or a powerful curse that causes Naruto to absorb all chakra. In the fanfiction world, it's common to introduce such unique elements. For example, he might find a magical scroll that, when opened, starts sucking in all the chakra in the vicinity and then channels it into Naruto. Or it could be a curse placed on him by an enemy, but instead of harming him, it gives him this strange power to absorb all chakra.
The consequence might also be a shift in the balance of power in the Naruto universe. With all that chakra, Naruto could potentially change the political situation. He could end wars single - handedly or force the different ninja villages to re - evaluate their strategies. Moreover, his own physical and mental state might be affected. There could be a struggle within him to keep his identity intact while dealing with such an overwhelming power source.
He could share it with Hinata. Given their relationship, Naruto might transfer some of his chakra to Hinata to protect her during a dangerous situation. This would also strengthen their bond further in the fanfiction.
One implication could be that Naruto becomes more powerful in combat. The chakra chains can be used as a weapon or a form of defense, allowing him to hold opponents in place or deflect attacks.
Perhaps Naruto unlocks the chakra chains because of a special item he discovers in Wave. This item could be something that has a connection to his past or to the chakra chains themselves. It might emit a certain energy that interacts with Naruto's chakra, causing the chains to be unlocked. Another possibility is that Naruto's encounter with the local chakra environment in Wave is different from what he's used to in Konoha. This new environment could act as a catalyst, triggering a reaction in his chakra system that results in the unlocking of the chakra chains.
Well, Naruto could also turn to his friends for help. In the Naruto universe, teamwork is highly emphasized. His friends like Sasuke, Sakura, and others have their own unique abilities. They could cover for Naruto's lack of chakra and together they could come up with strategies to fight opponents. Maybe Sasuke could use his Sharingan and ninjutsu skills, while Sakura could use her medical and combat skills to support the group.
Well, in the realm of fanfiction, anything is possible. There could be fanfictions where Naruto is made of chakra. This could be a way for the author to explore different aspects of the Naruto universe. Maybe it's a way to show a more spiritual or elemental side of Naruto. It could also lead to new plotlines like how he copes with being such an unusual being in a world where most people have chakra but aren't made of it.
He might gain an enormous boost in his chakra reserves. This could make his jutsus much more powerful and enable him to perform complex techniques with ease.
Naruto's dense chakra could make his friends either jealous or in awe. If he can do things with his chakra that others can't, some might envy his power. But his true friends like Sasuke and Sakura would be in awe and see it as a way to strengthen their team. For example, Sasuke might see Naruto's dense chakra as a new challenge to keep up with, which could improve their friendly rivalry.
In many fanfictions, the Rinnegan and chakra chains are often intertwined in terms of power and function. The Rinnegan, being one of the most powerful ocular abilities in the Naruto universe, can potentially bestow special properties on the chakra chains. The chakra chains themselves might be a way to channel the raw power of the Rinnegan. For instance, they could be used to bind opponents while simultaneously draining their chakra through the Rinnegan's absorptive capabilities. This connection adds an interesting dynamic to the characters who possess both the Rinnegan and the ability to use chakra chains, making for some really cool and unique battle scenarios in fanfiction.