There could be some new characters introduced in the fanfiction as Harry's allies. For example, a mysterious wizard from a far - off land who has a special kind of magic that can help Harry in his fight. Or perhaps an old, forgotten order of wizards who come out of hiding to support Harry when they see the new threat emerging.
His friends like Ron and Hermione would surely be his allies. They have always been by his side in the original stories, so it's likely they'll be there in the fanfiction too, helping Harry in his fight.
Maybe some unexpected allies could emerge. For example, a centaur who has witnessed the unjust actions of the court might come forward to help Harry. Or a goblin who has knowledge of the court's financial misdeeds could offer assistance. Harry's reputation for being a hero could attract all sorts of beings who want to see justice served in the court.
There could be a group of rogue witches and wizards who are against the current system in the wizarding world. They oppose the Ministry of Magic's rules and see Harry Potter as a symbol of the establishment they want to overthrow, so they become the antagonists.
Hermione would be a very likely ally. She's smart and resourceful, and could help Harry figure out the best ways to use magic against the Chitauri. Ron might also be there, with his loyalty and fighting skills. Additionally, some of the more experienced wizards or witches from Hogwarts could potentially join in to help Harry.
In a dark corner of Hogwarts, Harry was fuming. Malfoy had once again taunted him about his parents. Harry's eyes blazed with anger. Without a second thought, he lunged at Malfoy, his wand at the ready. 'You won't get away with this anymore, Malfoy!' he shouted. Magic crackled in the air as they dueled, Harry's newfound determination pushing him forward.
Hermione could be a strong ally. She's smart and could help Harry research more about battle magic. Ron too, with his loyalty and courage, would be by Harry's side.
Well, it could be that Harry is facing some new dark forces in the fanfiction. Maybe he discovers a hidden group of dark wizards who are plotting against Hogwarts, and he decides to fight back to protect his school and friends.
Hermione could be one of his allies. She's smart and resourceful, and her knowledge of magic could be very useful in different war situations. Also, Ron, with his loyalty and his own combat skills, would be a great help.
Maybe Harry Potter discovers a new dark threat in the fanfiction and has to fight it using his magical skills and the support of his friends. He could be facing a powerful dark wizard who has found a way to break through Hogwarts' defenses.
Daenerys Targaryen could potentially be an ally. She is open - minded about different powers and has her own dragons. Harry's magic could be seen as another powerful asset. And Jon Snow, being a noble and brave character, would likely welcome Harry's help in the fight against the White Walkers and might offer his own military expertise in return.
Ron and Hermione would most likely be his allies. They've always been by Harry's side through thick and thin. In this situation, they would use their respective skills, Ron's loyalty and Hermione's vast knowledge of magic, to support Harry in his mission to destroy Snape.