The plot might be what makes it unique. It could have a very different take on common light novel themes, like a really unusual way of handling relationships or power dynamics. For example, the story could be set in a world where the rules of society are very different from our own, and the characters have to adapt to these strange rules while also dealing with their personal issues. And the way the story progresses might be full of unexpected twists and turns that keep readers on their toes.
Sure. 'Aoharu x Kikanjuu' light novel is likely to have an interesting story. It might involve unique characters and a distinct plot. However, without reading it in detail, it's hard to give a very in - depth account.
I'm not very familiar with 'chisa x pon', so I can't say for sure if it's popular. There are so many manga out there that it's hard to keep track of all of them. It could be really popular within a certain niche group though.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.