It could be a magical sailing ship. Maybe it has enchanted sails that can catch the wind of magic and sail across different magical realms. Or it could be a small, personal ship that he uses to explore hidden corners of Hogwarts lake.
A flying ship would be a cool option. Picture Harry Potter on a ship that soars through the skies above the wizarding world. It could be made of a special magical wood that allows it to fly and be equipped with various magical gadgets for navigation and protection. Another possibility is a time - traveling ship. This would enable Harry to visit different eras in the wizarding history and have all sorts of adventures.
It could be a sleek, enchanted schooner. With sails that can change color according to the magical energy around it. The ship might have a figurehead that comes to life and gives advice, like a wise old wizard.
He could have adventures like exploring uncharted magical islands. Maybe he'd encounter new magical creatures and have to use his wizarding skills to either befriend or fend them off. For example, he might come across a group of mermaids who guard a powerful magical artifact on an island.
The plot could involve Harry building the ship with the help of his friends. They could all contribute their skills. For example, Hermione could use her vast knowledge of magic theory to ensure the ship's construction is perfect, while Ron could offer his practical skills. They might be building the ship to escape from some new dark force that has emerged in the wizarding world. Harry's ship would then be their means of getting away and finding a new place to start over. It could also be a ship that has special magical properties, like being able to fly or travel through time.
Well, perhaps Harry Potter uses his magic to gather materials from all over the wizarding world. He might use spells like 'accio' to bring in rare woods and magical metals. Then, with the help of his friends like Hermione, who could research the best construction spells, and Ron, who provides the brute force when needed, they start building the city - ship. It could be a floating city with different areas for Hogwarts - like classrooms, places for Quidditch, and areas for magical creatures.
Well, he might discover some magical secrets on the fog ship. Maybe it's a ship that has been lost in time and is full of ancient spells or artifacts.
Harry Potter could own custom-made wands or enchanted jewelry in fanfics. Also, some stories give him secret diaries or ancient magical tomes with hidden knowledge.
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.
Maybe Harry Potter steals a ship to escape from some dark wizards who are chasing him. He uses his magic skills to sail the ship stealthily and heads towards a hidden island where he hopes to find a powerful magical artifact to defeat the dark forces.
Redemption is also a theme. For example, in some fanfictions where Draco is a main part of a ship, his journey towards redemption while being in a relationship with another character is explored. It adds depth to the story and the relationship.
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.