This could bring out a more protective side of Remus towards Harry. He would be bound to Harry in a new way, and his loyalty would be even stronger. His character could also change in terms of his self - perception. He might see himself as more of a support figure to Harry rather than an equal comrade in some situations. He may also start to view Harry as someone he needs to protect not just as a friend but as his master in the context of being a familiar.
It would likely have a significant impact on Remus's independence. As a familiar, he may not have as much freedom to make his own choices as he did before. On the other hand, his relationship with Harry could deepen in a different way. He might be more in tune with Harry's emotions, which could lead to him being more empathetic and patient. Also, his lycanthropy might be affected in some way. Maybe the bond with Harry could give him more control over his werewolf side, or it could be a source of new problems when it comes to his transformations.
Remus might become more submissive in a way. Since he is now Harry's familiar, he has a certain obligation to follow Harry's lead. However, he would still retain his intelligence and wisdom. For example, in a battle, he might be more likely to wait for Harry's command rather than act on his own instincts immediately.
Well, one possibility is that Harry discovers a new magical ability that allows him to make a familiar. He chooses Remus because of their strong bond. Then, they might have a deeper connection in battles, with Remus being able to sense Harry's needs and intentions more acutely. Maybe Remus could also gain some new powers or abilities as Harry's familiar, which would be really interesting to explore in the fanfic.
The main characters would obviously be Harry Potter and Remus Lupin. Harry is the one who turns Remus into his familiar, so he is a central figure in this fanfic's unique plot. Remus, on the other hand, has his own complex identity as a werewolf and a former teacher at Hogwarts, and now he is in this new and rather strange relationship with Harry as his familiar.
Perhaps in this fanfic, there is some sort of danger in the wizarding world that can only be overcome by Harry and Remus having this special familiar - master relationship. Harry might turn Remus into his familiar to protect him from a dark force that is specifically targeting werewolves. As they navigate this new dynamic, they also have to deal with the reactions of their friends and the wizarding community at large. The story could explore themes of acceptance and the power of unconventional relationships.
He might use his Patronus. His Patronus could guide Harry out of a dangerous place or ward off Dementors that were about to attack Harry.
One possible fanfic could be about Remus Lupin's search for a permanent cure to his lycanthropy. It might involve him traveling to far - off places, meeting with ancient healers or magic users who claim to have the knowledge. Maybe he teams up with some of his old Hogwarts friends like Sirius or James in flashbacks, and they try to find a cure together. This would add an element of friendship and adventure to the story.
A fanfic could be centered around a magical plant that has the power to cure lycanthropy. Remus hears rumors of this plant in the Forbidden Forest. He ventures in, facing various magical creatures and dangerous terrains. When he finally finds the plant, he has to figure out how to use it properly. This could involve a series of trials and errors, and perhaps some help from Hagrid who knows the forest well.
He'd probably be more confident. With Sirius and Remus as his guardians, he'd have two strong male figures who believe in him wholeheartedly. Sirius's boldness and Remus's wisdom would rub off on him. He might be less hesitant in taking risks and more assertive in his actions.
In this fanfiction, their relationship could transform in a significant way. At first, they may have been more like acquaintances or even rivals among werewolves. But with Harry in the picture, they would be forced to communicate better. Remus could influence Fenrir to be more civilized, while Fenrir could make Remus more assertive. They would share the joys and sorrows of raising Harry, which would create a bond between them that was stronger than just their werewolf connection.
It would make their life at Hogwarts very special. For example, they might be able to use the unicorn's speed to get to classes faster. Just imagine zooming across the Hogwarts grounds on a unicorn instead of walking.
In the novel Harry Potter, Remus Lupin's patron saint was Hagrid.