One common theme is redemption. Since their relationship in the show had a lot of problems, fanfictions often explore how they can redeem themselves and their relationship. For example, Louis might try to make up for his past mistakes towards Blair.
One great 'Gossip Girl Blair and Louis fanfiction' is 'A Royal Reunion'. It delves into what could have happened if Blair and Louis had another chance at their relationship after all the drama. Another is 'The Royal Resurgence' which shows their journey of trying to reconcile their differences in a more mature way.
The Blair Witch is not a real entity. The 'Blair Witch' story was a fictional creation for a horror movie. However, it was presented in a found - footage style which made it seem more real. The movie creators used a lot of elements like the mystery of the Blair Witch legend, the idea of a haunted forest, and the disappearance of people to build up a spooky atmosphere. This was all part of the marketing and storytelling to scare the audience.
I'm not sure who exactly Louis Bird is in 'Louis Bird Telling Our Stories' without more context. It could be an author, a storyteller, or someone with a personal collection of stories to share.
No. The Blair Witch Project was presented as a 'found footage' horror movie, made to seem like a real story for the sake of creating a more immersive and terrifying experience for the audience. It was a fictional creation by the filmmakers.
It's not appropriate. Fan - created works should focus on positive aspects like character development, new storylines within the realm of propriety. Sexual fanfics are not in line with these principles and can cause discomfort to many people.