The story could also develop with Harry facing opposition. There might be a powerful wizard or a group that wants to maintain the status quo and sees Harry as a threat. They could try to stop him by any means necessary, including using dark magic against him. Harry would then have to find ways to defend himself and his cause, perhaps by learning new spells or getting help from unexpected sources like the centaurs who are also often marginalized in the wizarding world.
Dumbledore's Army members could also be his main allies. They have already shown their willingness to fight against injustice when they opposed Umbridge. Neville, for example, has grown into a very brave and capable wizard. He could lead some of the resistance on the ground. Luna Lovegood, with her unique perspective and ability to see things others don't, could also be a great asset in terms of strategy and providing moral support.
Perhaps Midoriya starts the civil war because he discovers a conspiracy within the hero ranks. Some powerful heroes are misusing their power for their own gain, and when he tries to expose them, they turn against him. So, he has no choice but to fight back. His friends and those who believe in his cause join him, and it turns into a full - scale civil war within the hero community.
It could start with Harry hitting a really low point due to his alcoholism. Maybe he fails a major exam or loses a close friend because of his drinking. Then, he realizes he needs to change. He could go on a journey of self - discovery, perhaps traveling to a far - off wizarding place to detox and learn new magical skills. This new environment would help him start fresh and build a new identity for himself.
In a fanfiction, Spider - Man could also die due to friendly fire. With the heroes split in the Civil War and the chaos of battle, it's possible that a misaimed attack from one of the heroes accidentally hits Spider - Man and causes his death.
One way could be that a magical portal opens between the two universes and Harry accidentally stumbles into the Nilfgaardians' territory. Then he has to fight to defend himself. Another idea is that some dark magic force brings the Nilfgaardians to Hogwarts and Harry steps up to protect his school and friends.
One way to develop it is through the exploration of relationships. Harry could form a special bond with each Avenger. For instance, he might see Thor as a kind of magical being from another realm like some wizards in his world. With Black Widow, he could share his experiences of having a difficult past and how they overcame it. This would build a deep emotional connection among them.
One way is to start with a magical accident or a powerful spell that transports Harry into the Witcher universe. Once there, he could be found by an old Witcher who takes him under his wing. They start training him, and Harry slowly learns the ways of the Witcher.
To develop it, you could introduce a new character who is a hybrid of a wizard and a Cybertronian. This character could be the link between the two worlds. Harry could then be drawn into the Cybertronian world through this character. In the Cybertronian world, Harry could discover that magic has a different manifestation. He could learn to combine his magic with the technology of the Cybertronians. For example, he could use his wand to control the energy flow in a Cybertronian's body, or use a spell to enhance a Cybertronian's weapon. The story could also explore the ethical implications of mixing magic and technology, and how it affects both the wizarding world and the Cybertronian society.
He could start by solving simple magical math problems, like calculating the amount of potion ingredients based on a ratio. As he progresses, he might study ancient magical math texts and learn more advanced concepts.
His relationships can be a key factor. For instance, his relationship with Aunt May could be explored further. Maybe she gets involved in some way because of the Civil War, and Peter has to protect her while also dealing with the superhero chaos. This would add depth to his character as he tries to balance his family life and superhero duties.