Another element could be the interaction between the wizarding world and the Muggle world of cars. Harry might have to hide his magic while fixing cars in the Muggle world, or he could introduce some magical car features that amaze the Muggles. In some fics, there could be a conflict when other wizards don't approve of Harry using magic in such a Muggle - oriented way. This adds drama and tension to the story.
Often, there is a discovery aspect. Harry might discover a new spell or magical technique specifically for fixing cars. Or he could find a hidden connection between the magical world and cars, like certain cars being enchanted long ago by wizards and now in need of a wizard's touch to be fully restored. This sense of discovery keeps the reader interested and curious about what will happen next in the fanfiction.
I'm not sure of the exact title, but there's a fanfiction where Harry teams up with Hermione to fix a car that has some sort of dark magic attached to it. Hermione uses her research skills and Harry his practical magic skills. Together, they figure out how to remove the dark magic and also upgrade the car's features in a magical way.
One interesting plot point could be Harry Potter implementing new and fairer house points systems in Hogwarts. This would change the dynamic between the houses and promote more unity.
Hermione Granger would likely be a main character. She could use her vast knowledge to help Harry in his efforts to fix Hogwarts, whether it's researching ancient spells for repairs or coming up with new educational strategies.
Maybe Draco Malfoy. He could make fun of Harry for trying to fix his hair and try to jinx his attempts, thinking it's a silly thing for Harry to focus on.
False accusations are very common. Usually, Harry is wrongly blamed for something he didn't do, like being involved in dark magic activities.
One common plot element is Harry's struggle with loneliness. Since he's immortal, he'll outlive all his friends and loved ones, which can lead to a sense of isolation.
Well, one common element is the use of magic in a strategic way. For example, in many such fanfictions, characters will use spells like the Disillusionment Charm to hide and then suddenly reveal themselves to surprise their 'prey'.
Well, one plot element is the discovery of the sword - related power or ability. Maybe it's a magical sword he finds or a latent ability within him that he unlocks. Then there's the part where he has to keep it a secret at first, because it's so different from normal wizarding abilities. And of course, there are often battles where his swordsmanship gives him an edge over his opponents, making him a key player in the fight against the dark forces in the wizarding world.
One common plot element is the reaction of the friends and family. In many of these fanfictions, Hermione and Ron might be shocked or supportive in different ways. Another element could be how the female Harry Potter deals with the challenges of being pregnant while still having to face the magical world's threats or her own identity issues.
One common plot element is the idea of Harry Potter having some form of immortality and then getting involved in the world of Hobbits. Maybe he uses his magic to help the Hobbits in some way, like protecting them from a new dark force.