A lesser - known but very well - written fanfic is 'Protecting the Boy Who Lived'. Here, Sirius is almost like a shadow to Harry. He anticipates every danger and is always one step ahead in safeguarding Harry. It has some great character development for both Sirius and Harry, and the way Sirius's protective nature is portrayed is very heart - warming.
There's also 'Sirius's Oath'. It shows Sirius making an unbreakable vow, in a way, to always protect Harry. It delves into their relationship, with Sirius teaching Harry things he never learned at Hogwarts, all while shielding him from the dark forces that are after him. It's really interesting as it also shows how Sirius's protectiveness affects Harry's growth as a wizard.
Another theme is redemption. Sirius may feel he has a lot to make up for, especially considering his past mistakes. By being protective of Harry, he's sort of redeeming himself. For example, in many fanfics, he tries to prevent Harry from making the same mistakes he did when he was younger.
Yes, there are many. You can start by looking on popular fanfic platforms like Archive of Our Own. Just search for 'Harry Frees Sirius' and you'll find a variety of stories with different interpretations and plotlines.
There are quite a few. Some fanfics focus on individual Slytherin students who form an unlikely bond with Harry. They might protect him from the dark forces that are after him, seeing him as more than just the 'Chosen One' but as a friend in need. These fanfics often explore the idea that not all Slytherins are bad and can be quite heroic when it comes to protecting someone they believe in.
One great fanfiction with this theme is 'The Green-eyed Boy' on FanFiction.net. It shows Harry's protective side towards Draco in a really interesting way, especially during their dangerous adventures at Hogwarts. The author does a great job of building their relationship gradually.
In some darker fanfics, Sirius might be faking ignoring Harry as part of a plan to protect him from a greater threat. He thinks that by distancing himself from Harry, he can keep Harry out of danger. But of course, Harry doesn't understand this at first and is deeply hurt.
There's also 'Sirius's Guidance'. This fanfic focuses on Sirius becoming a sort of mentor to Harry in ways that the books didn't fully explore. It's full of heart - warming scenes where Sirius imparts his knowledge and experiences to Harry, and it's well - written with a lot of interesting plot twists.
One great 'Sirius helps Harry' fanfic is 'The Bond Beyond Blood'. In this fic, Sirius helps Harry master some advanced magic that Dumbledore didn't have time to teach him. It's really interesting as it shows a different side of their relationship, more like a father - son bond in the world of magic.
One great fanfiction could be 'The Marauder's Influence'. In this story, Sirius raises Harry with all the love and values of the Marauders. Harry grows up to be confident and strong, and he has a great bond with Sirius. He also gets to learn a lot about his parents through Sirius' stories, which helps him in his journey at Hogwarts.
Well, 'The Green-eyed Monster' is another one. Draco's protective nature towards Harry kicks in when there are threats from the Dark forces. It's a slow - burn romance where Draco's actions to keep Harry safe gradually turn into deeper feelings. The author does a great job of building the tension between them.
There's also 'Sirius's Guardian Angel' which delves into how Sirius protects Harry in ways that are different from the original books. It might have some interesting plot twists where Sirius uses his unique abilities and knowledge to keep Harry safe, with some really touching moments between them.