I don't have enough details about 'choppiri toshiue demo kanojo novel' to give precise similar novel recommendations. But if it's about relationships in general, you could try 'Pride and Prejudice' by Jane Austen. It's a classic that focuses on the relationship between Elizabeth and Mr. Darcy, exploring themes like love, social class, and family. Although it may not be exactly similar, it does deal with relationship - centric themes that are often found in many novels.
Since I'm not familiar with the 'choppiri toshiue demo kanojo novel', it's difficult to say exactly. It might be a story that delves into the connection between two characters, perhaps with the male character being a bit older ('toshiue' could imply older age), and the story revolving around their relationship, which is common in many novels. But again, this is just a guess.
I'm sorry I can't recommend similar light novels as I'm not familiar enough with 'kawaiikereba hentai demo suki ni light novel' to make accurate comparisons.
One similar novel could be 'Kimi no Na wa' which also has themes of unique relationships. It's a very popular novel with a beautiful story.
I have no information indicating that it is popular. There are so many visual novels out there, and without any prior knowledge or data about this one in particular, it's difficult to say it's popular.
Some works that might be similar are fanfics related to 'K - ON!'. They share the aspect of exploring the relationships between characters in a rather cute and comical way. Also, fanfics from 'Love, Chunibyo & Other Delusions' itself, other than the one in question, can be a great source. They usually maintain the same tone and style, with a focus on the chuunibyou elements and the development of relationships. Additionally, there are some fanfics based on 'Toradora!' that have similar relationship - centric storylines and interesting character dynamics.
Since I'm not familiar with this specific visual novel, it might be about different characters' relationships and the story might revolve around how they interact with each other in various scenarios. Maybe it focuses on the character 'kanojo' and her experiences with different people, but again, this is just speculation without more knowledge.
One could be 'Oregairu' which also delves into complex relationships in a school and social setting. Another might be 'Toradora!', as it has elements of relationship development between a boy and a girl.
One similar light novel could be 'Toradora!'. It also involves complex relationships between the main character, a girl he has a relationship with and other friends. The story is full of humorous and heart - warming moments.
Since I don't really know the exact genre or plot of 'jimina ken sei wa sore demo saikyou desu web novel', it's hard to recommend similar web novels. However, if it's about a powerful character, you could try web novels in the isekai or fantasy genre where strong protagonists are common.
Since I don't know what '45510 novel' is about, it's hard to recommend similar novels. But if it's a mystery novel, you could try reading Agatha Christie's works like 'Murder on the Orient Express'.