Dumbledore, if he were still alive in the fanfiction, could be an ally. His wisdom and knowledge would be very useful for building a kingdom. Also, the Order of the Phoenix members might support Harry. They are all about fighting for what's right, and Harry's new kingdom could be seen as a new hope for a better wizarding world.
His friends Hermione and Ron would most likely be his allies. They have been with him through thick and thin in the original series.
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.
Hermione would be a great help. Her vast knowledge of magic and books could provide the necessary information for building the planet, like the right spells and magical theories.
Dumbledore might help in a spiritual or advisory way. Even though he's passed away, his wisdom could be passed on through memories or some magical means. Also, Hagrid could be a great help. He could assist in building areas suitable for magical creatures with his love and understanding of them.
Dumbledore (if he were still alive) could be an advisor. His wisdom and experience would be invaluable. Also, some of the Weasley family members like George, who already has experience in running a joke shop, could bring his business acumen to Harry's company, helping with sales, marketing, and product design.
His best friends, Hermione and Ron, would surely help. Hermione could contribute with her intelligent ideas and knowledge of magic for construction. Ron would be there for the physical labor part, using his strength.
The Ministry of Magic would probably oppose it. They are always concerned about maintaining the secrecy of the wizarding world and a stargate could potentially expose it to non - magical beings or lead to unwanted magical interference from other realms.
Dumbledore, even if in spirit or through some magical means, could be an ally. His wisdom and foresight could guide Harry in making important decisions for the kingdom. Also, the house - elves, if Harry treats them fairly and gives them freedom and a place in the kingdom, could be loyal allies. They could take care of the day - to - day running of the castle or important buildings in the kingdom, using their unique magical abilities.
Well, in this fanfiction, Harry might build a kingdom in a hidden location, perhaps an uncharted island. He would have to use powerful spells and his knowledge of magic to construct buildings, set up defenses, and form a government. He could also invite his friends like Hermione and Ron to help him, and together they would make laws that are fairer than those in the wizarding world we know from the original books.
Hermione would surely be one. She's smart and would be great at helping with the academic side of building a school, like creating the curriculum.
His friends like Hermione and Ron would surely be his first allies. They have been through so much together and would support his vision.