I also like 'Through Time with Harry and Sirius'. It's a rather long fic that gives ample time to build up the relationship between Harry and Sirius. The time travel aspect adds a lot of mystery and adventure, like when they go back to the Marauders' era and have to navigate through the complex relationships there.
One great fic could be 'A Time for Changes'. It beautifully weaves the relationship between Harry and Sirius while using time travel in an interesting way. The author creates a believable alternate timeline where their relationship develops in unexpected ways.
Love and sacrifice are also prevalent. Harry and Sirius' relationship deepens in these fics, and they often have to make sacrifices for each other during their time - traveling adventures. For example, Sirius might sacrifice his own safety to protect Harry in a different time era. And the theme of family is important too. They form a sort of family unit that is different from the traditional ones in the wizarding world.
One great fanfiction could be where Hermione travels back in time to save Sirius. Maybe she uses her time - turner in a new and creative way. In this kind of fanfiction, she might have to outwit the Ministry of Magic and the Death Eaters who are after Sirius. She could change the course of the story by preventing Sirius from going to Azkaban in the first place.
There's also a fanfic called 'Sirius Black: Through Time'. In this one, Sirius accidentally gets sent to different time points in his own life. It's really engaging as it shows how he reacts to seeing his past self and how he tries to change certain events. It delves deep into his personality and relationships, making it a must - read for Sirius Black fans. The way the time travel elements are woven into the story of his life makes it very unique.
One great Sirius Black OC time travel fanfiction is 'A Second Chance'. In it, the OC travels back in time and forms an unexpected bond with Sirius. It's really well - written, with great character development for both the OC and Sirius.
Another good one is 'Time's Ripple'. Here, Hermione discovers a time - travel device and uses it to go back to Sirius's time. The fic focuses on how their different personalities and knowledge from different times interact and create a unique story line.
One popular fanfic with this theme is 'Time's Threads'. In it, Harry and Ginny use a time - turning device to go back and save Sirius. The story is really engaging as it shows their struggle to fit into the past timeline without disrupting too much. They face challenges like dealing with the younger versions of their friends and family.
One great James Sirius Potter time travel fanfiction is 'Back in Time with James'. It has an interesting plot where James travels back to the Marauders' era and tries to fix some family issues. The author does a great job of portraying the different eras and how James adapts to the past.
A really cool one is 'Back to the Beginning'. In this fanfiction, Hermione uses a newly discovered time - traveling spell to go back to the very start of Hogwarts. It's filled with her trying to fix things while also dealing with the founders of Hogwarts. It's a long read but very engaging.
I've read a fanfic called 'Time - Twisted Daughter'. In this story, the daughter's time travel is an accident. She ends up in the past and has to figure out how to get back while also dealing with the chaos of being in a time where her father is still a student at Hogwarts. It's full of mystery and adventure.
One popular Harry Slash Time Travel fanfiction is 'Back to the Start' where Harry travels back in time and his relationship with a certain character takes a new and interesting turn.