Well, in the Amnesia custom story, the jumpscares can be really intense. Sometimes it's the sudden appearance of a grotesque creature that blends in with the environment until it's too late. For example, you might be examining an old painting on the wall, and then a horrifying face emerges from it. Also, when you hear strange noises getting louder and louder and then a monster jumps at you, that's a classic and terrifying jumpscare.
Well, in a fan fiction of 'Spooky's House of Jumpscares', the plot could center around a new character who enters the spooky house. This character might have a unique backstory, like they're on a quest to find a lost friend who disappeared in the house. As they journey through the house, they encounter all the classic jumpscares but also discover hidden secrets about the house that were never revealed in the original. Maybe they find out that the house is actually a portal to another dimension and they have to figure out how to close it before more horrors are unleashed.
It depends on the specific fan fiction. It could be original characters created by the fan writer, or it could be characters from the original 'Spooky's House of Jumpscares' given new roles or personalities.
One possible theme could be fear. Given the mention of 'jumpscares', fear would likely play a major role. Naruto characters might be put in spooky situations that they have to overcome.
I'm not sure if it's popular. There are so many fanfics out there that it's hard to gauge the popularity of one specific one without looking at relevant fanfic platforms and their statistics.
The title 'spooky's house of jumpscares lemon fanfic' is rather mysterious. 'Spooky's house of jumpscares' sounds like a story set in a haunted or creepy location where there are lots of sudden frights. As for the 'lemon' part in fanfic, it can mean different things. It might be that there are some steamy or suggestive scenes in the story, but it could also just be a term used to make the title more eye - catching or unique. Without actually reading the fanfic, it's difficult to be more precise about its content.
The main spooky character is often quite popular. Fans like to write about his motives and what makes him so intent on scaring people. Also, any brave characters who dare to enter the house are usually well - liked in fan fictions.
There could be a villainous character in the fanfic as well. This could be a dark entity that controls the house of jumpscares and is trying to keep Naruto trapped inside. So Naruto, his potential friends who come to his aid, and this villainous entity would be the main characters in the story.