Neville could also be an ally. He has grown into a brave and confident wizard. His own experiences of being underestimated could make him a strong supporter of Harry's ideas in the Wizengamot, especially when it comes to issues like equality among wizards and giving a chance to those who have been overlooked in the past.
Hermione would likely be one of his allies. She's intelligent and has a strong sense of justice, always having been interested in the rights and wrongs of the wizarding laws. She could provide Harry with valuable research and advice.
Ron could also be an ally. Even though he may not be as into the political side of things as Hermione, his loyalty to Harry is unwavering. He can provide moral support and also use his Weasley family connections to gain some support from other wizarding families who might be more open - minded.
In this fanfiction, Harry might also form alliances within the Wizengamot. He could team up with some of the more progressive members to counter the conservative forces. His skills as a wizard and his leadership qualities from his time at Hogwarts could come in handy in the political arena of the Wizengamot. He could even start initiatives to improve the relations between the wizarding world and other magical creatures, which would be a significant step forward in the world of Harry Potter fanfiction.
Some of the more progressive magical families like the Weasleys might side with Harry. They've always been on the side of good and if Harry shows that his rule would bring positive changes to the wizarding world, they'd be his allies.
Hermione would definitely be one of his top allies. Her intelligence and knowledge of magic and history would be invaluable in helping Harry rule. She could advise him on laws and policies, especially those related to education and the treatment of non - human magical beings. Ron would also be an ally. His loyalty and his understanding of the wizarding world's less - sophisticated side could help Harry connect with the common wizards.
Hermione would definitely be one of his allies. She is smart and resourceful and would be able to help Harry navigate the new political and magical situations he faces as a prince. For example, she could research ancient laws and prophecies related to his new status.
He might face political intrigue. There are likely those in the Wizengamot who oppose him due to his past actions and his association with Dumbledore. Also, he has to deal with the complex and often archaic laws and traditions of the wizarding world which could be a huge obstacle.
Ron could also be an important ally. His loyalty and courage would be great assets. He might be in charge of security or diplomatic relations with other magical communities, using his Weasley charm to smooth things over.
Dumbledore could be an unexpected ally. He might see this as an opportunity for Harry to stand up for himself and gain some closure on his difficult childhood. Also, some of the Hogwarts professors, like McGonagall, could be on Harry's side. They have always cared for Harry's well - being and would not tolerate the Dursleys' abuse. And there could be some new magical characters introduced specifically to help Harry in his legal battle, like a wizard lawyer who has a soft spot for underdog cases.
His friends Hermione and Ron would most likely be his allies. They have been with him through thick and thin in the original series.
He might use powerful magic or make bold statements to intimidate them.