It could also be a potion shop. Harry has experience with potions from his time at Hogwarts. In Konoha, he could sell potions for various purposes, like healing potions which could be useful in a ninja village where there are often battles and injuries.
Well, it could be a magic item shop. Since Harry Potter is from the wizarding world, he might sell things like wands, potions, or magical artifacts in Konoha.
He might use his magic skills to stand out. For example, his ability to perform spells could be seen as a unique talent in Konoha. His shop could become a place where ninjas are curious to visit and learn about different kinds of magic.
He could open a magic item repair shop. Since ninjas also use various tools and weapons, Harry could use his magical skills to repair and enhance them. For example, he could fix a broken kunai with a simple spell or add some magic properties to a ninja's headband to make it more durable.
There's also a possibility that it's a Chinese Fireball. These dragons are very beautiful and powerful. In a fanfiction, the author might choose this type of dragon for Harry Potter to own because it would add an element of exoticism and grandeur to the story.
The third challenge could be acceptance. The people in Konoha may be skeptical of a stranger from a completely different world trying to open a shop. They might not trust his magical items or be afraid that his presence could disrupt their way of life. Harry would need to prove himself trustworthy and show that his shop can bring benefits to the community.
Perhaps it's an island with a hidden wizarding school, similar to Hogwarts but with its own distinct features. There might be ancient spells protecting the island, and the architecture could be a blend of different magical styles. Harry could have discovered this island during one of his adventures and decided to make it his own. He might use it as a sanctuary for those in need or as a place to study and preserve rare magic.
Well, perhaps it's a planet with its own system of magic. It might have a core made of pure magic essence which gives power to all the magic on the planet. And there could be different regions, like one area filled with floating islands where powerful wizards live.
He might have discovered the island during one of his adventures and claimed it as his own. Since there was no one else on the island at the time, and he was the first to set foot on it and recognize its potential, he decided to make it his property.
Maybe he inherits it. In the wizarding world, there could be some old family connections or a will that passes the ownership of the bank to him.
In this fanfiction, Harry could use his extensive knowledge of potions from his Hogwarts days. He might create unique potions that combine the traditional magic of potions with his own experiences. For example, a potion that gives the drinker a sense of calm during a Dementor encounter, using the essence of happy memories as an ingredient. He could also hire some of his old classmates like Neville, who has a great talent for Herbology, to supply rare ingredients for the shop.
In the fanfiction, he might own a building that is actually a magical library. Since Harry has always been interested in knowledge, this building could be full of rare and ancient magic books. It could also be a place where wizards and witches from all over come to study and research, and Harry, as the owner, would be in charge of protecting these precious knowledge resources.