Yes, there are likely Inuyasha fanfics involving Kohaku. You can start your search on fanfic websites like Fanfiction.net or Archive of Our Own. Just type in 'Inuyasha Kohaku' in the search bar and you'll find various stories related to him.
Well, there could be several ways. It could be that they are part of the same community or group. Or perhaps there's a mystery or adventure that forces them to interact and thus, Ruri gets to know Senku. Maybe it's all part of a complex web of relationships that unfolds as the manga progresses.
I'm not sure specifically as I haven't read it in detail. But generally, a light novel often contains elements like unique characters, a fictional world, and a plot that might involve adventure, relationships, or some sort of mystery.
A lesser - known but really well - written kohaku x sango fanfic is 'Under the Moonlight with Kohaku and Sango'. It focuses more on their emotional connection and how they understand each other on a deeper level. The descriptions in this fanfic are very vivid, making it a great read.
Since I don't have in - depth knowledge of 'kohaku iro no hunter visual novel', it might center around the adventures of a hunter. The 'kohaku iro' could be a significant aspect of the game's world, like the environment having a particular amber - like color palette, and the hunter has to navigate through this world, facing various challenges and meeting different characters.
One common theme is adventure. Given the diverse characters of Kohaku, the dragon and Kagome, they are likely to embark on exciting adventures, exploring new lands or fighting against mysterious foes.
Well, 'senku x tsukasa fanfic' like 'The Path of Understanding' is really good. It starts with their initial clashes and then gradually develops into a story of mutual respect. 'Shared Visions' is also great as it imagines a scenario where they both have to combine their skills for a common goal. And 'Hidden Depths' reveals the more complex aspects of their relationship through various events in the story.
You can try looking for it in local bookstores that have a section for light novels. Some big - chain bookstores usually carry a variety of light novels.