In such a fanfiction, perhaps Harry Potter could use his magic to find an unclaimed land. He might then use spells like 'accio' to gather resources for building infrastructure. He could also use magic to educate the people, like creating self - teaching spell books.
Well, Harry Potter might build a country based on the principles of Hogwarts. For example, there could be houses similar to Gryffindor, Hufflepuff etc. for different groups of people. He could use his fame to attract wizards and witches from all over the world to join his new country. And he would definitely need to create a magical defense system around the country to protect it from dark wizards.
One possible plot could be that Harry Potter, after defeating Voldemort, realizes that the wizarding world still needs a new kind of society. So he starts from scratch. He uses his knowledge of magic and his experiences at Hogwarts. He might use the Room of Requirement as an inspiration to create buildings that can change according to the needs of the people. He would also need to establish laws, which could be a mix of traditional wizarding laws and some new ones he creates based on equality and justice for all magic - users.
Ron could also be a great ally. His loyalty and courage would be important. He might be in charge of security, using his skills in wizard chess to plan out defensive strategies. And of course, the Weasley family in general could offer a lot of support, with their various skills and connections in the wizarding world.
Well, perhaps Harry uses his magic to shape the planet. He might create unique magical creatures and ecosystems. For example, he could make a forest where the trees are made of living fire that doesn't burn but gives warmth and light.
Maybe Harry builds a magical trunk that has special compartments for his school supplies, like a self - organizing quill holder and a spell - protected space for his invisibility cloak. It could also have a hidden entrance to a small room where he can study privately without being disturbed by his roommates.
Maybe Harry Potter builds the fortress to protect Hogwarts from a new dark threat. He could use his magic skills and the knowledge he has gained over the years to construct an impenetrable fortress with magical defenses like anti - apparition wards and powerful spells.
Maybe Harry uses magic to create an island as a secret hideout from the Dark forces. He could make it full of magical creatures and plants that he discovers during his adventures.
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.
Maybe Harry Potter builds a home in a hidden forest near Hogwarts. He could use magic to create a cozy cottage with a fireplace that always has a warm fire burning, and rooms filled with memories of his friends and adventures.
Well, perhaps Harry Potter discovers some ancient magic that has the potential to create a stargate. He might use his knowledge from Hogwarts and the wizarding world to assemble the components of the stargate. Maybe he's on a quest to find a new form of magic or a lost spell that is only accessible through the stargate.
The plot could involve Harry Potter building a town that is a blend of the Muggle and magical worlds. He could build schools that teach both magic and Muggle subjects, houses that have both magical and non - magical features. He wants to create a place where wizards and Muggles can co - exist and learn from each other. This would be a revolutionary idea in the Harry Potter universe and would attract all kinds of people, leading to many adventures and challenges along the way.
The plot could involve Harry using his knowledge of spells and potions to create a unique starship. He could also recruit his wizard friends to help him. For example, Hermione could use her vast knowledge to research the best magical elements to incorporate into the ship's design, while Ron could provide his loyalty and physical strength for the more labor - intensive parts of the construction. And they might face challenges from the wizarding world, like the Ministry of Magic trying to stop them for fear of revealing magic to the Muggle world through their starship adventure.