As of the current manga chapters, Sanemi is still alive. His character has gone through many challenges but has managed to survive. The plot continues to unfold with him as an important part.
Since I don't have specific details about this 'sanemi light novel', it's hard to say precisely. However, in many light novels, the plot often includes elements such as a unique setting, be it a fantasy world or a post - apocalyptic one. Sanemi might be at the center of a mystery or a power struggle. There could be a love interest involved too, which could add an extra layer of complexity to the story.
You can find sanemi fanfic on some well - known fanfic platforms like Archive of Our Own (AO3). There are tons of fan - created stories about Sanemi there. Another place could be FanFiction.net, though the selection might be a bit different. Some fandom - specific forums may also have links to or host sanemi fanfic.
The main character is Sanemi. Depending on the type of light novel, there could be a group of characters around him. For instance, if it's an adventure - themed one, there might be fellow adventurers who each have their own skills and personalities. There could be a healer in the group who takes care of Sanemi when he gets injured, or a strategist who helps plan their next moves. And then there might be a mysterious character whose true intentions are not clear at first, but as the story unfolds, they turn out to be either a great ally or a formidable foe.
One idea could be a rengoku fanfic where he trains a new group of young slayers. It could focus on his unique teaching methods and how he instills his values in them.