If Harry Potter becomes a super soldier in fanfiction, it would change the whole dynamic of the wizarding world. His physical abilities would be enhanced, which means he could perform feats like flying on a broomstick with greater precision and speed. Also, his super soldier healing factor could help him recover quickly from dark magic attacks. This new version of Harry would likely rewrite many of the rules in Hogwarts, as he could participate in both magical and physical challenges with ease.
Well, he'd probably be an even more formidable wizard. He could use his super soldier strength and agility along with his magic. Maybe he could cast spells faster or endure more difficult magical tasks without getting tired so easily. He might also be able to combine his combat skills from being a super soldier with his dueling skills, making him a really tough opponent in any magical battle.
If Naruto becomes a super soldier in fanfiction, he may change in terms of his personality too. With great power often comes a sense of responsibility or in some cases, overconfidence. He could start to view himself as an even greater protector of the Hidden Leaf Village, but also might struggle with the newfound power and how it sets him apart from his friends. Also, the story could explore how the other characters react to this 'super' Naruto, whether they are in awe, jealous or feel more secure with him around.
The Super Soldier Serum in the Harry Potter universe would likely cause a stir. Some pure - blood wizards might oppose it, seeing it as a Muggle - like intrusion into their magical realm. However, those more open - minded, like Hermione, might see it as an opportunity to further enhance their skills for the greater good. It could also lead to new types of magic - enhanced super - soldiers in the fight against dark wizards.
His relationships would change a great deal. With Hermione, he might become more of an equal in terms of physical capabilities. They could go on more dangerous adventures together without her constantly worrying about his safety. Ron might feel a bit left out at first, but then they'd all adapt. His enemies would be more afraid of him, and his friends would look at him in a new light, perhaps with a bit of awe and also some concern as his new abilities might make him a bit of a loose cannon.
In some fanfictions, if Harry Potter becomes a warlock, he might gain even more powerful magic. He could have greater control over spells and be able to perform magic that was previously thought impossible. For example, he might be able to manipulate time in a more complex way or have the power to instantly transport himself anywhere in the wizarding world without the need for a Portkey or Apparition.
If Harry Potter becomes god in fanfiction, he might completely reshape the magical world. He could rewrite the laws of magic, perhaps making it more accessible and less dangerous. He could also bestow extraordinary gifts upon his friends. Hermione might gain the ability to instantly understand and master any spell or bit of knowledge, and Ron could become an unbeatable warrior with superhuman strength in the face of any danger.
In this kind of fanfiction, Harry might teach his children magic in a very different way from how he was taught. He would be extremely protective, having faced so many dangers himself. Maybe he'd pass on the lessons he learned from his own battles, like the importance of friendship and courage.
If Harry Potter becomes the Joker in fanfiction, he would probably start to question all the values he once held. The Joker is all about subverting order, so Harry might begin to undermine the Ministry of Magic and other institutions. He could use his knowledge of magic to play cruel pranks on people, not the innocent kind of pranks he used to do. His Gryffindor courage could be twisted into a reckless disregard for the safety of others.
If Harry Potter becomes a Jedi, he would likely combine his existing magical skills with Jedi abilities. His Patronus charm could be enhanced by the Force, becoming an even more powerful protective entity. He might use his wand as a sort of lightsaber hilt, channeling the Force through it for unique combat moves. His ability to apparate could be refined with Jedi - like teleportation skills. Also, his knowledge of the wizarding world's dark magic could help him better understand the dark side of the Force and avoid its temptations.
If Harry Potter becomes a Lamia in fanfiction, his relationships would change drastically. His friends might be both intrigued and a bit scared at first. He would have to adapt to his new form and its characteristics. For example, he may need to learn how to control any new instincts that come with being a Lamia. Also, his role in the fight against Voldemort could be completely different. Instead of using a wand in the traditional way, he could use his Lamia - related powers to combat the dark forces.
If Harry Potter becomes a demon in fanfiction, his relationships would be severely affected. His friends like Ron and Hermione would be very confused and possibly afraid of him. They might try to find a way to reverse the transformation. And Hogwarts itself would be in chaos. The teachers would be divided on how to deal with him, some might want to help him while others might see him as a threat to the safety of the school.