A 'Harry Potter train's alone' fanfiction could have a plot where the train is abducted by a powerful dark force. The train has to fight back using its own magical properties. It could call on the spirits of the railway tracks or the magic of the surrounding forests to help it. Or perhaps the train discovers that it has a long - lost sibling in the form of another magical vehicle, and it goes on a quest to find it while being alone.
In a fanfiction about the Harry Potter train being alone, perhaps it could become a magical entity on its own. It might start to travel to mysterious destinations not on the regular Hogwarts route. Maybe it would pick up lost magical creatures or even lost wizards from different eras. It could be a place of refuge for those in need, with its compartments transforming into mini - magical habitats.
His character would likely become more introspective. Without his friends always around, he'd have to face his inner thoughts and feelings. He might become more self - reliant and learn to trust his own judgment even more.
Maybe he's frustrated with all the prophecies and his role in the fight against Voldemort. He doesn't want to be constantly pushed into being the hero. He might want some time to figure out who he really is outside of all these expectations. Also, he could be feeling a bit overwhelmed with his studies and the extra - curricular activities like being in Dumbledore's Army. All these things together make him long for some solitude.
Hermione could still be a common character. Even in fanfiction where Harry is alone, Hermione might be mentioned in his thoughts or in flashbacks as someone who has influenced him. For example, he might recall her advice on how to study magic when he is facing a difficult spell alone.
One idea could be a crossover where Train Heartnet, with his unique skills as a sweeper, somehow ends up in the wizarding world of Harry Potter. Maybe he's on a mission to retrieve a magical artifact that has fallen into the wrong hands in Hogwarts. His combat abilities and sharp senses would make for an interesting dynamic in the magical setting.
Well, in such a fanfiction, Harry might disappear to train in some hidden place, away from the prying eyes at Hogwarts. Maybe he goes to a secret location with a powerful wizard who teaches him advanced magic that he couldn't learn at school. This could include dark magic defenses or ancient spells.
Merlin might start by teaching Harry the basics of magic from a different perspective. Maybe he would show Harry how to draw magic from the very essence of nature. For example, instead of using a wand in the traditional way, he could teach Harry to use his hands and the energy around him.
Anubis could train Harry Potter through a series of trials. These trials would test Harry's courage, wisdom, and his ability to face the unknown. For instance, he might be put in situations where he has to make difficult choices regarding life and death. Anubis would also likely teach Harry about the balance between light and dark magic. He would show Harry that there is power in the darker aspects of magic if it is used for the right reasons. This would be a completely new concept for Harry, as Hogwarts mainly focuses on the light side of magic. Through these teachings and trials, Harry would grow into a more powerful and well - rounded wizard.
One interesting story could be about Harry facing challenges alone in the Forbidden Forest. Maybe he discovers a hidden magical creature that no one else knew about and has to figure out how to deal with it on his own.