Since the title focuses on the 'zombie shoujo', she's probably a main character. There could be other characters like her friends or family from before she became a zombie, who are now either trying to save her or are in conflict with her new state. Maybe there's also an antagonist, perhaps someone who created the zombie situation in the first place and is causing more trouble for the girl.
Given the title 'aru zombie shoujo no sainan light novel', the main character is most likely the zombie girl. However, there may be other important characters. For example, there could be a group of survivors who initially fear her but then come to understand her. There might also be a character with special powers or knowledge that is crucial to the zombie girl's story, whether it's to help her adapt to her new existence or to fight against the source of the zombie outbreak.
I don't know for sure as I haven't read this light novel. But I would assume the zombie shoujo (girl) is one of the main characters. There might also be a character who is helping her deal with her zombie state, like a scientist or a kind - hearted person who stumbles upon her.
I'm not sure exactly as I haven't read it. But generally, a 'zombie shoujo' (zombie girl) in the title might suggest a story about a girl who has become a zombie and perhaps faces various difficulties or adventures. The 'no sainan' part might imply some sort of trouble or crisis she is in. It could be a story full of horror, survival, and maybe some elements of mystery.
Mikoto Misaka is another important character. She is a Level 5 esper in Academy City, known as 'Railgun'. She has a strong sense of justice and is involved in many events related to the espers and the secrets of the city.
The main character is usually a girl who loves literature. There might also be her friends in the literary club, like a boy who is also interested in books and helps her in her literary pursuits.
Index and Kamijou Touma are main characters. Index has a lot of magical knowledge, and Touma has the Imagine Breaker ability.
Aya Asagiri is one of the main characters. She's a girl who has a difficult life at school and at home, and then gets involved with the Mahou Shoujo Site.
I'm sorry I don't know the specific main characters in this light novel.
Without having read the 'busou shoujo machiavellianism light novel', it's difficult to name the exact main characters. However, based on the title, we can make some assumptions. The main characters are probably young women. One might be a protagonist who is highly intelligent and uses Machiavellian tactics to gain an edge in the world of the novel. There could be other supporting female characters, some of whom might be friends or allies, while others could be rivals. They would all be involved in various events, such as battles or strategic planning, and their individual personalities and goals would shape the overall narrative of the story.
I don't know for sure as I haven't read it. But typically in a magical girl story, there would be the lead magical girl, perhaps a mentor figure, and likely some friends or comrades who are also magical girls.
There is a girl named Madoka who is one of the central characters. She gets involved in the whole magical girl system.
I'm sorry, I don't know the main characters as I haven't read this light novel.