I'm not sure specifically as there could be many 'ringo light novels'. It might be about a character named Ringo, and could involve various themes like adventure, friendship, or fantasy, depending on the genre of the light novel.
There might be a fanfic where Ringo discovers a hidden power within herself during a crucial battle in the Naruto universe. This could lead to her becoming an important ally to the main characters. For example, she could use her newfound power to help Naruto defeat a powerful enemy. She might also form new relationships with other characters like Sasuke or Sakura as a result of this discovery.
Since it's called 'ringo light novel', Ringo is probably a main character. There could also be her friends or family members as other main characters. For example, she might have a best friend who accompanies her on her adventures, or a family member who has some important role in the story, like a wise grandmother who gives her advice.
In Pulp Fiction, there isn't a character named 'Ringo' in the most obvious sense. However, if we consider it as a kind of code or an inside - named character by fans or in some analysis, it might be related to the overall theme of the movie about different underworld characters. The movie is full of such characters that seem ordinary on the surface but have deep and often violent or criminal backstories. So this 'ringo character' might be part of that complex web of characters.