I think it can be a lot of fun. You get to see different interpretations of your favorite characters in intense battle situations. It's like a whole new world of possibilities.
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.
Tanjiro would be a great character to pair with rengoku. Their different personalities could create an interesting interaction. Tanjiro's kind - hearted nature and rengoku's fiery determination could lead to some great storylines.
The Shining was a classic horror film directed by Stanley Kubrick and released in 1980. The movie was about a lonely hotel owner and his family staying in a seemingly comfortable but actually extremely scary room. As time passed, they began to find themselves trapped in a mysterious and terrifying world.
The film received high praise and reputation around the world and was considered a classic in the history of film. The horror atmosphere and the design of the thrilling scenes were widely imitated and used as a representative work in the history of movies.