I'm not sure about its popularity. It might be popular within certain niche communities who are fans of visual novels, especially those interested in stories with female - centric characters. However, without more data on its sales or community following, it's hard to say for certain.
I'm not entirely sure specifically as I haven't fully explored it myself, but generally a visual novel is a form of interactive fiction. It might involve stories about relationships among characters. Maybe it's about different aspects of the relationships between 'kanojo' (which might mean 'she' or 'girlfriend' in Japanese).
There isn't much information available to me regarding its widespread popularity. However, if it has unique storylines, engaging characters, and good graphics (if applicable), it could potentially be popular among the visual novel community. Some visual novels gain a cult following even if they are not well - known to the general public.
Since I'm not familiar with this specific 'kyuukyoku shinka shita light novel', I can't tell you who the author is. It could be an indie author or a part of a small - press publication. You could try reaching out to light novel enthusiasts or checking with local bookstores that carry a wide variety of light novels to see if they know anything about it.
I'm not entirely sure as I haven't played it in detail. But generally, a visual novel often involves a story with characters and various plotlines. It might be centered around relationships with the female characters (since 'kanojo' means 'she' or 'girlfriend' in Japanese).
Since we don't have much specific information, we can assume that the main character is likely related to 'kanojo'. It could be a male character who has a relationship with her, like a boyfriend or a friend. And of course, Kanojo herself is a main character as the title seems to be centered around her.
As I haven't read the 'hiota no kanojo light novel', I can't say for sure who the main characters are. But if we assume from the title, Hiota is likely to be one of the main characters, and his 'kanojo' (which means girlfriend in Japanese) is probably another important character. There might also be supporting characters like their friends or family members, but without reading it, it's all speculation.
In 'kyuukyoku shinka shita full dive rpg novel', the main characters could be diverse. There might be a group of friends who decide to enter the full - dive RPG world together. One could be the strategist, always thinking of the best ways to approach quests. Another might be the fighter, strong and brave in battles. And there could be a character with special abilities, like magic or hacking skills within the game, that helps the group overcome difficult situations.
Since I haven't had the chance to read the 'kyuukyoku shinka shita full dive light novel', I can't name the exact main characters. However, in light novels of this kind, we often find a central character who is either thrust into an unusual situation, like the full - dive world in this case, or is on a quest. There could be side characters that are fellow divers, or perhaps characters from the virtual world itself that the protagonist interacts with.