Well, one possibility is that his friends might be initially shocked. But then they would likely accept him and vow to protect his secret. After all, they've been through a lot together already.
In the fanfiction, Naruto's enemies' reactions could vary greatly. For instance, Orochimaru might see it as a chance to conduct more experiments on Naruto or the tailed beast. The Akatsuki, on the other hand, might change their plans completely. They were after the tailed beasts, and now that Naruto has revealed his, they might either try to capture him right away or come up with a more elaborate plan. And then there are smaller enemies who might just cower in fear at the thought of facing a jinchuriki like Naruto who has openly shown his power.
They would probably be shocked. Since Naruto is such an important figure to them, any big secret would likely cause a stir. For example, if it's about his Nine - Tails secret, they might be initially stunned as they realize how much he has been carrying alone.
I think 'naruto ten tailed beast fanfiction' can be really interesting. It often explores the power and mystery of the ten - tailed beast in unique ways. Some fanfictions might focus on how the characters interact with this powerful being, like Naruto's potential new jutsus or his changed relationships due to the ten - tailed beast's influence.
One idea could be that Naruto discovers a new ancient power source that fuses with his existing chakra, gradually transforming him into an 11 - tailed beast. This new form could give him abilities beyond what we've seen in the original series, like the power to manipulate time on a small scale. Maybe he uses this new power to go back in time and prevent some of the tragedies that occurred in the Naruto world.
In terms of his relationship with the other tailed beast hosts, it could become more complex. He might have a new understanding of what they've been through, but at the same time, they could be jealous of his new form. Some might see him as an upstart, while others might look to him for leadership. Naruto would have to navigate these tricky relationships carefully, all while trying to figure out his own new identity as a tailed beast.
He could be experimented on by rogue ninja scientists. These scientists might have been researching ways to create super - powerful beings and see Naruto as the perfect test subject. They use some forbidden jutsu or strange technology to try and force the creation of an 11 - tailed form within Naruto.
One interesting fanfiction could be where Naruto has an unexpected and more powerful tailed beast transformation during a major battle. Maybe he combines the power of all the tailed beasts in a new way, surprising his enemies and allies alike.
Well, Naruto himself might still be a main character as he has a strong connection to the tailed beasts in the original series. He could be the one trying to understand and deal with the 10 - tailed beast in new ways.
Perhaps he reveals his dreams for the future of the Hidden Leaf Village that are more personal and not part of his official Hokage - related goals. For example, he might talk about his hopes for how the different ninja clans interact and co - exist in a more harmonious way, something that he has been thinking about but hasn't shared with the group yet.