Maybe he owns a ninja training academy as a business. Since he is a powerful ninja, he can pass on his skills and knowledge to the next generation. He could offer different levels of training courses for both beginners and more advanced students.
Sakura could be one of his partners. She is smart and has medical skills which could be useful in a business, for example, if it's a health - related business like a spa or a herbal medicine store.
Well, Naruto has a big heart. He would manage his business in a way that benefits the community. He'd offer fair prices, maybe even provide free services to those in need. He'd also hire people who are passionate about the business, not just for profit, but to create a positive and inclusive environment. He'd learn about business management as he goes, making mistakes but always striving to improve.
One possible plot could be that Harry, after defeating Voldemort, decides he wants to do something different. He uses his Triwizard Tournament winnings to start a broomstick - making business. He teams up with some of the best broomstick makers in the wizarding world and creates a new line of broomsticks that are faster and more maneuverable. However, he faces competition from established broomstick companies who try to undermine his business.
In this type of fanfiction, Harry might own a business that is related to his adventures. For example, he could start a business that offers guided tours of the places he has been during his battles against Voldemort. This would not only attract wizarding tourists but also Muggle - born wizards who want to learn more about their magical heritage. He would have to deal with things like marketing, hiring employees, and handling the finances, which would be a whole new set of challenges for him.
I don't think it's a super popular concept in the Naruto fanfiction community. There are so many directions fanfiction can take. Some focus on romance, others on battles or new powers. While Naruto's relation to Konoha is fundamental, the idea of him 'owning' it in fanfiction is not something that seems to be everywhere. That said, there may be some fanfictions out there that play with this idea, but compared to things like exploring Naruto's heritage or his growth as a ninja, it's probably not as prevalent.
One common theme is self - discovery. When Naruto owns property, he often discovers new things about himself, like his connection to the land or the history of his family. Another theme is power. The property might hold some source of power, like a hidden chakra reserve or a powerful weapon. Also, friendship is a theme. His friends often get involved in helping him with the property, whether it's renovating an old building or exploring a mysterious land.