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.
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.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
One popular 'Santa Muerte' fantasy novel could be 'Santa Muerte: The Saint of Death' which delves into the unique mythology surrounding the Santa Muerte figure. It weaves a tale of mystery and the supernatural, exploring her role in a fictional world filled with magic and intrigue.