Another storyline might involve Sirius Black traveling back in time to prevent his own imprisonment. In this fanfic, he could change the past in ways that have a huge impact on Harry's life at Hogwarts, like making sure that Harry has a more stable family environment with Sirius as a guardian from a young age.
One interesting storyline could be Sirius Black surviving the Battle of the Department of Mysteries and then helping Harry train secretly for the final battle against Voldemort. He could teach Harry some advanced magic that he learned from his time in Azkaban and the Order of the Phoenix.
One interesting fanfiction could be about Sirius Black secretly training Harry Potter in advanced magic during his time at Hogwarts. This would add a whole new dimension to their relationship and Harry's growth as a wizard.
One interesting storyline could be Sirius Black protecting baby Harry from the remaining Death Eaters. He uses his skills as an Animagus to outwit them and keep Harry safe. For example, he might transform into his dog form to lead them astray while secretly hiding Harry in a magically protected place.
One common plotline is Sirius Black escaping from Azkaban earlier and secretly training Harry in advanced magic. Another could be Sirius and Harry going on a hidden adventure to uncover more about Harry's parents. There are also stories where Sirius plays a more active role in the fight against Voldemort at Hogwarts, using his knowledge of the Dark Arts and his Animagus form to their advantage.
One interesting fanfiction could be about Sirius Black mentoring Harry Potter in some advanced magic that Dumbledore didn't teach him. It might involve Sirius sharing secrets of the Black family's magical heritage with Harry.
There are several cool Sirius - centric fanfic concepts. For example, a fanfic could be centered around Sirius's time at Hogwarts as a student. It could show his friendship with James Potter, Remus Lupin, and Peter Pettigrew in more depth, including all the mischief they got into. Or it could focus on Sirius's relationship with his Animagus form. How did he feel about being a dog? What were the advantages and disadvantages? Also, a concept could be Sirius trying to clear his name while still in Azkaban, using his magical abilities in ways that no one thought possible from a prisoner.
One interesting storyline could be about Harry and Ginny raising their kids and dealing with the challenges of passing on the wizarding traditions while also protecting them from the dark forces that still lurk. Another might be about Ron and Hermione as parents, trying to balance their Ministry jobs with family life and teaching their children about the importance of friendship and loyalty, just as they learned in their own adventures at Hogwarts.
A possible storyline is that the wizarding world is trying to integrate more with the Muggle world after 19 years. There could be a plot where Harry and his friends are at the forefront of this movement. They might face opposition from some traditional wizarding families who are afraid of losing their pure - blood status or magical traditions. This could lead to all sorts of adventures and challenges for the characters as they try to bridge the gap between the two worlds.
One interesting storyline could be about the teammates going on a secret mission outside of Hogwarts. They might face new magical creatures and have to use their combined skills to survive.
One interesting storyline could be about creating a new magical creature in the Harry Potter RPG fanfic world. The character might discover a hidden spell that combines the essence of different animals, leading to a whole new species. This could then cause a stir in the wizarding community, with some seeing it as a great discovery and others fearing the unknown implications.
One great fanfic could be 'Sirius' Legacy' where Sirius Black not only raises Harry but also imparts some unique magical knowledge passed down in the Black family. It shows a more in - depth exploration of Sirius' own magical heritage and how he uses it to shape Harry's upbringing.