Perhaps there's a misunderstanding where Harry's friends think he's done something terrible, like being a spy for Voldemort. So they abandon him. Harry then has to prove his innocence and regain their trust by going on a dangerous quest alone that reveals the truth.
One possible storyline could be that Harry discovers his friends have been influenced by dark magic or a powerful spell that makes them shun him. He then has to find a way to break the spell while also dealing with his own feelings of betrayal and isolation.
He might turn to his studies more intensively. Since he has no friends to distract him, he could pour all his energy into learning new spells and magic, becoming more powerful in the process.
Yes, it is possible in the realm of fanfiction. Fanfiction allows for creative and often out - of - the - box interpretations. Writers can create scenarios where Harry Potter befriends the Basilisk. Maybe through some magic that tames the Basilisk or a special bond that forms due to shared experiences. It goes against the traditional narrative of the series but that's the beauty of fanfiction, it can rewrite and reimagine the story in many ways.
One possible plotline could be Harry feeling extremely depressed at first. He might isolate himself even more, spending long hours in the library or wandering the Forbidden Forest alone. Another plotline could involve him finding new, unexpected allies who help him grow stronger and more independent. For example, he could befriend some of the house - elves who have their own unique magic and knowledge.
One possible storyline could be Harry making friends with students from different houses at Hogwarts. For example, he befriends a shy Ravenclaw who helps him with his studies in a unique way. Another could be Harry befriending magical creatures, like a friendly centaur who gives him advice on dealing with the Forbidden Forest.
One possible storyline could be a character getting hit by a powerful dark spell during a battle, which causes brain damage. Then the story could revolve around their struggle to regain their magical abilities and memories. For example, if Harry were to be the one with brain damage, he might have to relearn spells and how to interact with his friends in Hogwarts.
One possible storyline is that the Potter Manor is under attack by a new dark force. Harry and Ginny have to defend it using their skills and the help of their friends. Another could be that they are renovating the manor and discover some long - lost family secrets during the process.
A possible storyline is that Ruby Rose, with her combat skills, trains the students at Hogwarts in self - defense against the dark arts. Harry Potter might be initially skeptical but then realizes the value of her unorthodox methods.
One storyline could be that Harry, after the events in the wizarding world, decides to take a break and travels to Gotham. There he meets Bruce, and they end up teaming up to take on a new threat that combines magic and Gotham's usual criminal element. Maybe a villain who has somehow gotten hold of a powerful magical artifact and is using it to wreak havoc in the city.
One possible storyline could be that the hobgoblin is a magical creature that has been trapped in Hogwarts for centuries and Harry discovers it. The hobgoblin then teams up with Harry to uncover the secrets of Hogwarts that are related to a new dark threat. Another could be that the hobgoblin is a messenger from an unknown magical realm and it chooses Harry to be the one to communicate with its realm.
Well, it could be a story where Harry is tricked into believing that Muggles are responsible for some great harm to his loved ones in the wizarding world. So, in his rage and misdirected sense of justice, he starts targeting Muggles. But this is a very un - Harry - like behavior as the real Harry is all about protecting the innocent, whether they are wizards or Muggles.