One possibility could be that Harry uses his fame and influence in the wizarding world against Snape. For example, he could spread rumors about Snape's past misdeeds that were overlooked during the war. Harry might also use his skills as an Auror to dig up some dirt on Snape, perhaps something related to his time as a Death Eater. Another way could be that Harry uses his friendship with Hermione and Ron to come up with some elaborate pranks to embarrass Snape in front of the students and faculty at Hogwarts. Maybe they could use magic to make Snape's potions backfire during a class demonstration or cause his robes to change color unexpectedly.
Well, in a fanfiction scenario, Harry could use his knowledge of the Marauder's Map to constantly keep tabs on Snape and then use that information to his advantage. He could show up at the most inconvenient times for Snape, like when he's in a secret meeting or doing something he doesn't want others to see. Harry might also find a way to expose Snape's unfair treatment of students. Since Harry has experienced it first - hand, he could gather testimonials from other students and present it to the school authorities, which would be a huge blow to Snape's reputation at Hogwarts.
Harry could potentially use his connection to Dumbledore's memories and knowledge to undermine Snape. If there were any secrets or half - truths that Snape had been hiding, Harry could discover them through Dumbledore's old things. He might also use his own memories of Snape's actions during his time at Hogwarts, especially the times when Snape was particularly cruel to him. Harry could write a tell - all book about his experiences with Snape, which would surely damage Snape's standing in the wizarding community.
One possibility is that Snape would be extremely strict with Harry. He might force Harry to study Potions intensively, but also secretly protect him from the Dark Arts threats that lurk in the wizarding world. Since Snape has his own complex past and feelings towards Harry's father, this adoption could be filled with emotional turmoil for both of them.
In this fanfiction, Harry could be on a quest to protect dragons. Given his kind heart, he might learn about the cruel treatment of dragons in some parts of the wizarding world, like in dragon - breeding for the Triwizard Tournament. So he decides to take a stand and try to ensure their well - being. This could lead to him making new friends or enemies in the process, and exploring new parts of the wizarding world that are related to dragons.
In a Fem Harry Potter is Enkidu fanfiction, it might show Fem Harry Potter idolizing Enkidu. She could study the stories of Enkidu and try to incorporate some of his values into her life in Hogwarts. Since Enkidu was known for his strength and his relationship with Gilgamesh, Fem Harry Potter could perhaps form a similar strong bond with one of her friends, like Hermione or Ron, inspired by Enkidu's story.
Well, 'harmony' in Harry Potter fanfiction often refers to the pairing of Hermione and Harry. A'redo' could mean rewriting the story with a different focus on their relationship. Maybe it gives them more romantic moments earlier on, or changes the events that led to their relationship developing differently than in the original books.
A phylactery in the context of some fictional lore is often associated with dark magic and immortality. In a fanfiction where Harry Potter makes a phylactery, it could be a very dark turn for his character. Maybe he's been corrupted by the idea of never dying after facing so many near - death experiences. It could also mean that he's delved into some really old and dangerous magic that he doesn't fully understand. This could lead to a story where he has to grapple with the moral implications of creating such a thing, as well as deal with the reactions of his friends and the wizarding world at large.
It could entail Harry having the powers of a dovahkiin. So he might be able to shout like a dragon and have enhanced physical abilities. He could use these powers to fight Voldemort in a completely different way, perhaps using dragon shouts to disarm or stun death eaters.
Well, it could be a really strange crossover. Maybe Harry Potter would be given some of Deathstroke's skills, like his combat abilities and strategic thinking. He could be using his wand like a sword and casting spells in a more aggressive, Deathstroke - like way.
He could compose magical music. For instance, music that has the power to heal or protect. In fanfiction, his musical skills might be used to soothe a wounded dragon or restore a damaged magical forest.
One possible motive could be a misunderstanding. Maybe Snape is framed for something really bad, like a dark magic plot against Hogwarts. Harry, in his haste to protect the school and his friends, believes Snape is guilty and takes drastic action. Another reason could be if Snape accidentally endangers someone Harry loves dearly, like Ginny or Ron, and Harry's emotions get the better of him in the heat of the moment.
Perhaps in the fanfiction, Hermione tempts Snape by challenging his beliefs. Snape has his own set of views on magic, house rivalries, etc. Hermione, being the fearless thinker she is, could question him on these things. This would make Snape re - evaluate his long - held ideas and create an interesting dynamic between them.