Swords could also be on sale. There are many different types of swords in the Naruto world, like the Kusanagi sword which is quite famous. Naruto might have some replicas or even unique swords in his shop.
He might sell kunai. Kunai are basic and very popular weapons in the Naruto universe. They are small, easy to handle and can be used in various combat situations.
The old ninja masters could visit Naruto's shop too. They might be interested in seeing what new and innovative things Naruto is doing with his shop. Some of Naruto's former teachers like Kakashi could also drop by regularly. He might give Naruto some advice on running the business or just come to have a friendly chat while browsing the items in the shop.
Ninjas would be the main customers. They need weapons for their missions, training, and self - defense. Whether they are from Konoha or other villages, they would come to Naruto's shop to get the best weapons.
His old friends from Hogwarts like Hermione and Ron could be regulars. They might come to support Harry's business and also to buy some useful things for their own magical lives. Maybe Neville would come to buy some special plants for his own gardening projects.
He might sell Butterbeer cupcakes. They would have the rich, creamy flavor of Butterbeer in the frosting and a moist, spiced cake base. It would be a hit among wizards and witches.
Perhaps it's a community building. Naruto is a very community - oriented person. He could own a building that serves as a place for the villagers to gather, like a community center. There could be a cafeteria, a place for kids to play, and rooms for meetings and celebrations.
In such a fanfiction, Naruto might sell ninja tools in his shop. He could use his own experiences as a ninja to recommend the best weapons or items for different missions.
Magical bows and arrows are also sold. The bows could be made from enchanted vines that give them flexibility and strength. The arrows might be tipped with substances that can cause different effects, such as freezing an enemy on impact or setting them on fire. And there could be arrows that can track their targets magically, ensuring a high chance of hitting.
He could get a sword with special powers. It might be able to cut through any material, even chakra - based defenses. Or it could have the ability to absorb the chakra of those it strikes.
Naruto could also make a staff. Given his connection to nature energy through Sage Mode, he could fashion a staff that can better conduct and store nature energy. It could be made from a special type of wood found in the Hidden Leaf's forest, which has natural chakra - absorbing properties.
There could also be external threats. Maybe other villains or rival ninja clans see the apartment building as a target. They might try to take it over or destroy it to undermine Naruto's influence in the village. Naruto would then have to use his combat skills and strategic thinking to protect his property.