His family members also play roles. His father, Harry Potter, could be mentioned, perhaps giving Albus advice or being a source of inspiration. His siblings might also be included, adding family - related sub - plots to the story.
One interesting plot could be Albus making unexpected friends on the Hogwarts Express. Maybe he meets a shy first - year who has a unique magical ability that Albus has never seen before. They then form a bond and face challenges together at Hogwarts.
The main characters are obviously James Albus and Lily Potter. They are likely to be the central focus of the fanfiction, with their adventures and experiences at Hogwarts being the main storyline.
There could also be some new characters introduced. Maybe a student who also had a late start in a previous year and can give Harry some advice. Or a magical creature that Harry encounters on his way to Hogwarts late and that creature becomes some sort of guide or protector for him during his time at Hogwarts.
There could be a character like Tom, a Smeltings student who is very disciplined but curious about the magical world of Hogwarts. He might be the main character who drives the story forward as he experiences all the new things at Hogwarts.
Well, aside from the main trio, characters like Luna Lovegood are quite common. She might offer her unique insights to Harry in his new role. Also, the Weasley family members, especially Ginny, could play important parts. And of course, many fanfictions include the Hogwarts professors such as Flitwick and Sprout, who interact with Harry in different ways as he takes on the role of Hogwarts master.
One possible plot could be that James Albus and Lily Potter are facing a new mystery at Hogwarts. Maybe they discover a hidden chamber that no one has found before and inside it are secrets about their family's past at Hogwarts. They then have to figure out how to deal with these revelations while also keeping up with their studies and normal Hogwarts life.
Rose Granger - Weasley could also be a main character. Given her intelligence and her family's history, she could play a crucial role. She might be the one who discovers some important clues about the servant of Nagini through her research in the Hogwarts library. And she could use her magical skills, which she has inherited from her parents, to assist Albus and others in dealing with the servant.
Naruto would obviously be one of the main characters. And for the Hogwarts side, it could be Harry Potter himself. Imagine Naruto and Harry having a unique connection that develops into a yaoi relationship. They both have a sense of justice and a willingness to fight for what's right, which could be the basis for their relationship.
A common theme is family. Since they are Potters, their family history and relationships play a big role. Another theme is friendship. They often have to rely on their friends in the stories.
Power and magic are also common themes. In many of these fanfictions, Albus discovers new magical abilities or has to deal with powerful magic that he hasn't encountered before. For example, in some, he might come across ancient and extremely powerful spells. Also, friendship and alliances play a big role. He forms new friendships with characters from other stories and they team up to face challenges together. This often leads to interesting character dynamics.