The 'inukami light novel' typically involves elements such as the relationship between humans and inukami (dog deities in Japanese mythology). It often has a story filled with adventures, magic, and the unique bond that develops between the characters and these supernatural beings.
I'm not entirely sure about all the main characters specifically in the 'inukami light novel' as there could be various versions or interpretations. But usually, there would be a human character who has a special connection to the inukami world, perhaps a young person with a strong will. And of course, there would be inukami characters, which could be different types with distinct traits.
The Jujutsu Kaisen manga is indeed ending. It's been a great run, but all good things must come to an end. The final chapters are bringing closure to the characters and story arcs.