It's hard to say. You'd have to investigate the context and the author's intentions. Maybe there are elements of truth mixed with imagination to create the story of Kate Wallis.
Shani Dev is an important figure in Hindu mythology. He is associated with the planet Saturn. In the stories, Shani Dev is known for his strict and just nature. His influence on people's lives was believed to be related to karma. People often feared his wrath as it was thought that his negative influence could bring hardships and misfortunes. However, it was also seen as a way to correct one's karmic path and learn important life lessons.
I'm not sure who Marcella Wallis specifically is in Pulp Fiction. It could be a minor character, an extra, or perhaps someone related to the production that isn't widely known in a very prominent role within the movie.
There's no prominent character named Marcille Wallis in the well - known 'Pulp Fiction'. It could be that it's a name that is either misremembered or from a very niche part of the film's production or a really deep - cut reference. Maybe it's an alias for someone involved in the making of the movie that only a few insiders would know about.
I'm not familiar with the 'Shani Grah' life story. It could be a name from a particular culture or community that I'm not well - versed in. If it's a personal acquaintance of yours, sharing some key details about their background or achievements would be useful for me to start with.
One characteristic of geralt and shani lemon fanfiction is the exploration of the Witcher world from a different perspective. Since Geralt is a Witcher and Shani is a character within that universe, the fanfiction can show how their relationship develops in a more intimate way. It may also include details about the Witcher lore and how it affects their relationship. For example, Geralt's mutations and his way of life might be intertwined with his relationship with Shani. Also, the lemon aspect usually implies some level of sexual content, which can be written in different styles, from very explicit to more subtly suggestive.
Since I have no knowledge of the 'shani original story', the main characters could be a diverse group. It could have a hero - like character, or perhaps it focuses on a group of friends or family members. Without reading it, it's all speculation.