Yes, there are such fanfictions in the Harry Potter fan community. Some fans like to explore alternative family relationships and storylines, so they create fanfictions where Snape is Harry's father. It adds a whole new dimension to the story, often changing the dynamics between the characters and how events unfold.
In these fanfictions, Snape might ignore Harry because of his past with Harry's father. James Potter bullied Snape when they were at school, so Snape could be projecting that hatred onto Harry. It's a simple yet powerful motivation for his behavior.
One common theme is redemption. Snape, who has a rather dark past in the original series, can be seen as redeeming himself through his fatherly relationship with Harry. Another theme is the exploration of family. It shows that family doesn't have to be blood - related in a traditional sense.
Definitely not. The story clearly shows that James Potter was Harry's dad. Snape had a complex relationship with Harry, mainly due to Snape's love for Harry's mother, but he was not related to Harry in that way.
In most of the fanfiction exploring this concept, evidence is often fabricated within the alternate universe created by the author. It might be things like Snape secretly protecting Harry out of a fatherly love that is more intense than just a teacher - student bond. However, in the original 'Harry Potter' series, there is no such indication.
Well, I'm not sure of the exact titles, but in general, such fanfictions often explore the emotional turmoil Harry must feel. Snape ignoring Harry can be a source of great angst. Some fanfictions in this genre might focus on how Harry's friends react to this situation. Maybe they try to intervene or they end up getting caught in the middle of Harry and Snape's strange relationship. It's all about the complex web of relationships within the wizarding world.
One possible plot could be that Harry discovers some new information about his parents that makes him see Snape in a different light. However, instead of handling it calmly, he snaps because of all the pent - up anger and confusion. For example, if he finds out that Snape had a more complex role in his parents' lives than he thought. His snapping could involve shouting at Snape in front of the whole school, which then sets off a chain reaction of events that slowly changes their relationship from one of enmity to something more like a father - son dynamic, full of misunderstandings and reconciliations.
Well, if Snape were Harry's dad in this fanfiction, Harry's isolation might take on a different tone. He could be more conflicted. Knowing Snape is his father, a man he had such a tumultuous relationship with before, would make him question his own identity. He might be more withdrawn as he tries to come to terms with this new family truth, and his relationships with his friends might become strained as he feels they couldn't possibly understand what he's going through.
Harry Potter and Severus Snape are the central figures. However, the other Hogwarts professors could also be important. For instance, McGonagall. She might be the one who tries to calm Harry down after he snaps at Snape or she could be the one who encourages Snape to be more understanding towards Harry. Then there are the Death Eaters. If the fanfiction is set in a context where Voldemort is still a threat, the actions of the Death Eaters could impact the relationship between Harry and Snape. They could be the catalysts that force Harry and Snape to work together and ultimately strengthen their father - son - like bond.
It would be really complex. Snape has always had a love - hate relationship with Harry. As his godfather, he'd probably be strict but also protective. Harry would likely resent Snape's strictness at first but gradually come to understand his motives.