Not having played this visual novel, it's difficult to name the exact main characters. But if we assume it follows common visual novel tropes, there could be a group of characters around the 'aku no onna'. There might be a childhood friend who has a different view of her compared to others, and perhaps a mysterious figure who holds some secrets related to her origin or true nature. These characters would interact with her and drive the plot forward.
I'm not sure specifically as I haven't played it in detail. But generally, a visual novel often involves a story with characters, plot development, and probably some kind of relationship exploration. 'Aku no onna' might be centered around a female character who could be associated with some sort of 'aku' which might mean 'evil' or 'dark' in Japanese, so perhaps it's about her story in a dark or complex situation.
I'm not entirely sure as I haven't specifically played it. But generally, a visual novel often has a story with characters and different plotlines. It might involve themes related to the title, perhaps about female characters ('onna kanbu') in some sort of context, which could be related to a dark or 'aku no' (evil or bad) situation. However, without more information, it's hard to be more precise.
Since I don't have direct experience with it, it's difficult to say for sure. However, some visual novels have unique art styles that set them apart. Maybe 'aku no onna kanbu visual novel' has a distinct art style that enhances the mood of the 'aku no' (dark) theme and the portrayal of the female characters ('onna kanbu').
The main characters are likely the 'denpa onna' and the'seishun otoko' as the title suggests.
It could be someone from the Naruto universe who doesn't like Naruto's newfound fascination with Aku. For example, Danzo might see Naruto's interest in Aku as a threat to the stability of the village and try to stop Naruto from further exploring Aku - related things. So, Danzo could be the main antagonist in this case.
Aku could be a storyteller. Maybe it's a person's name.
I have no specific information about the 'a3 visual novel' characters. However, in many visual novels, there are often diverse characters. There could be a young hero or heroine as the main character. Maybe there are some mysterious figures that are part of the 'a3' concept. They could be people with special abilities or knowledge that the main character has to interact with, either as allies or antagonists.
I don't have enough information to determine who the main characters in '707 visual novel' are. It could have a diverse cast of characters such as a brave hero, a cunning villain, and some interesting side characters.
Since I don't have specific information about this '999 visual novel', I can't tell you exactly who the main characters are. But usually in a visual novel, there are protagonists who drive the story forward, and there might be supporting characters like friends, family members, or antagonists who create conflict.
Since we don't know the details of '86 visual novel', we can't say for sure who the main characters are. They could be ordinary people living in a fictional world, or they could be heroes with special abilities. It all depends on the nature of the story which we don't know yet.