Another possibility is that he gets involved in high - level village politics. As a jounin, his opinions would carry more weight. He could use his influence to advocate for better relations between the Leaf Village and other villages, or to push for improvements within his own village like better training facilities for the younger ninja.
Naruto could also be tasked with training a new generation of ninja. Since he has his own unique style of fighting and a lot of experience, he would be a great mentor. He might teach them his signature rasengan or how to better control their chakra.
In a fanfiction where Naruto is promoted to chunin, he might immediately start taking on more challenging missions. He could be put in charge of a team, leading his peers and showing off his newfound leadership skills.
One challenge could be leadership. As a Jounin, he'd have to lead teams. Naruto has always been more of a lone wolf in some ways, so coordinating and guiding others might be tough. Also, there would be more complex missions. He's used to straightforward 'beat the bad guy' type of missions, but now he has to deal with politics and long - term strategic goals.
Naruto's strong sense of justice and his unwavering determination to protect the village could also play a role. He has shown time and again that he would sacrifice anything for Konoha. His moral compass and his courage in the face of danger could be seen as qualities befitting a Jounin, even at a young age.
In this fanfiction, perhaps Mikoto could teach Naruto some unique Uchiha techniques. Since she's from the Uchiha clan, she might have insights into fire - style jutsu that could help Naruto diversify his skills.
In this fanfic, Naruto could finally gain the respect he truly deserves as a Jounin. He might lead his own team and pass on the lessons he learned from Kakashi and others. His unique jutsu like the Rasengan could be further developed and he could use it in more creative ways during missions.
In such a fanfic, Naruto might lead his own team of genin. He could pass on his unique ninja skills and his never - give - up attitude to the younger ninjas. Also, he may be involved in more high - level and dangerous missions, using his new - found status to gain access to classified information that could help the Hidden Leaf Village in the long run.
Well, he could be tortured for information about Konoha. The Iwa ninjas might try to extract secrets about new jutsus or strategic plans. They could also use him as a bargaining chip against Konoha.
He might start training with it. Naruto is always eager to improve his skills, and a new sword could be a great addition to his combat abilities.
One possibility is that Naruto's chakra nature could change completely. Since Kaguya had unique chakra, Naruto might develop new jutsu that are a blend of his own and Kaguya's abilities. For example, his Rasengan could gain the power to not only attack but also to heal, as Kaguya had some form of life - giving power. Also, his connection to the tailed beasts could be enhanced in unexpected ways, allowing for better communication and cooperation with them.
Well, if Naruto was caught singing fanfiction, it could lead to some really interesting situations. His friends might be super surprised and start teasing him about it. They could also be impressed if he's actually good at singing. Maybe it would even become a new inside joke among the group.