Well, in these fanfictions, we see a more vulnerable side of Sirius. For example, in many of them, his time in Azkaban is explored in greater detail. We get to understand the true extent of the psychological damage it caused him, which makes his character more three - dimensional.
Remus Lupin is often present. He was one of Sirius' old friends and a fellow Marauder. Their friendship can be delved into deeper, especially considering the complex history between them. Dumbledore is another common character. He plays an important role in the wizarding world and his interactions with Sirius can add depth to the story.
La Santa Muerte is often associated with folk religion and has various beliefs and tales attached. Some see it as a protector, while others have different interpretations. It's a complex and diverse story.
One possible fanfiction could be about Sirius Black being in a situation where he has to face Voldemort alone. Maybe he discovers a secret weakness of Voldemort that no one else knows. Sirius, with his brave and reckless nature, decides to take advantage of this knowledge to try and take down the Dark Lord once and for all.
A fanfiction could center around Sirius Black's attempts to rescue someone from Voldemort's clutches. He uses his skills as an Animagus and his knowledge of the wizarding world's hidden paths to get close to Voldemort's lair.
Sirius Black was a complex and tragic character. He was part of the Black family, a pure - blood wizarding family. He was Harry Potter's godfather. Sirius was wrongly accused of betraying the Potters and murdering 13 people with a single curse. He escaped from Azkaban prison, which was a great feat as it was guarded by Dementors. He then hid in his Animagus form of a large black dog. He played an important role in Harry's life, providing love and support when he could.
Well, Sirius Black's scars in fanfiction can vary a lot. Some fanfictions might focus on the emotional scars that are not as visible but are just as deep. His scars could be used to show his connection to other characters too. Maybe a scar he has is linked to a shared experience with Remus Lupin, which then builds on their friendship in the story.
For a more angsty read, there's 'Sirius' Forbidden Love'. It deals with the difficulties of Sirius being in a gay relationship in the wizarding world. It shows the internal struggles he faces, as well as the external pressures, and how love still manages to find a way through all that.
It could develop in a complex way. The spanking incident might initially create tension between them. Harry could be angry or resentful towards Sirius at first.
The exploration of the afterlife is also a frequent theme. Since Santa Muerte is associated with death, novels might take readers on a journey through different realms of the afterlife. Also, themes of justice and vengeance can be found. Santa Muerte is sometimes seen as a figure who can dispense justice, so characters might seek her help for revenge or to right wrongs.