A great 'harry saves sirus fanfic' might involve Harry teaming up with unexpected allies. Maybe he teams up with some of the Hogwarts ghosts who know secret passages. They help him reach Sirius quickly and he is able to save Sirius from the clutches of Voldemort's minions by using their knowledge of the castle's secrets.
There's a 'harry saves sirus fanfic' called 'The Rescue of Sirius'. In this fic, Harry has a premonition of Sirius's danger just in time. He uses his Patronus to send a message to his friends and they all work together to create a diversion while Harry sneaks in to save Sirius.
One possible plotline could be that Harry discovers a powerful time - traveling spell in his third year at Hogwarts. He decides to use it to go back in time and save his parents. Along the way, he has to face challenges like avoiding detection by the time - turner regulations and dealing with dark wizards who are also lurking in the past.
One possible aspect to analyze is Snape's complex character. In many 'Snape Saves Harry' fanfics, it delves deeper into his motives. Snape has always had a love - hate relationship with Harry. In these fanfics, his act of saving Harry might be due to his lingering love for Lily. It shows a different side of Snape, one that is more heroic and self - sacrificing than what we see in the original series at times. This also allows for exploring different plotlines and character development arcs for both Snape and Harry.
I also like 'When Snape Becomes Harry's Guardian'. In this fanfic, Snape saves Harry from a dangerous situation early on, and then takes on a sort of guardianship role. It has some really interesting interactions between the two characters as they learn to live with each other.
One possible storyline could be that Batman has to use his detective skills to find out a hidden threat to Superman before saving him. Maybe there's a kryptonite - based weapon that only Batman can detect and disable.
One possible plot point could be Dudley finally realizing the true nature of the danger Harry is in and using his new - found courage to save him. Maybe he discovers some secret about Voldemort that helps him protect Harry. Another could be Dudley using his physical strength, which he was known for in the original series in a more heroic way to fend off Death Eaters.
The idea of Fenrir saving Harry is interesting because it subverts the typical relationship. Fenrir is often seen as a villain in the Harry Potter universe, so when he becomes the savior, it creates a whole new dynamic.
Well, in some of these fics, Sirius might time - travel to save Harry from a future threat. For example, he could see a vision of Harry being killed by Voldemort in a new and terrifying way, and then he uses time - turning magic to go back and change the course of events.
There are 'Harry Potter fanfic fanfic' that focus on time - travel scenarios. Imagine if a character from the later books travels back in time to the first year at Hogwarts. This can create a lot of interesting plot twists as they try to change or preserve the original story line. Also, some fanfic fanfic might center around magical creatures in a way that wasn't fully explored in the original books, like the life of a hippogriff in more detail.
A common plotline is that Daphne saves Harry from a dark magic attack. For example, she might notice a cursed object meant for Harry and intervenes just in time.