Often, there's also a theme of mystery and discovery. The members are trying to figure out what's causing the hauntings, which leads to a lot of plot twists and turns. For example, in some fanfics, they might discover that an old curse is the reason behind the spooky happenings, and they have to find a way to break it while also dealing with their own fear and the public perception of them as idols.
One common element is the spooky atmosphere. There are usually things like creaking floors, cold drafts, and strange noises to set the mood. Another element is the use of Naruto's ninja abilities in a new and different context. Since it's a haunted mansion, he might use his shadow clone jutsu to scout ahead or his rasengan to break through barriers created by the haunted forces.
One common theme is the exploration of Naruto's courage. Facing the unknown in a haunted mansion really tests his bravery. For example, in many of these fanfictions, Naruto has to enter dark rooms or deal with strange apparitions, which shows his growth as a character in terms of being fearless.
One common theme is fear. These novels often play on our deepest fears, like the fear of the unknown, the fear of death, and the fear of things that go bump in the night.
A frequent theme is 'Time - Travel'. In these fanfics, a character, often Naruto, travels back in time and tries to change the past. This allows for a whole new set of adventures and interactions. Another common theme is 'The Ninja World's Politics'. Fanfic writers explore how the different hidden villages interact, form alliances, and compete for power in more detail than in the original series.
Maybe Naruto gets cursed during a mission, and the curse makes him see apparitions of his worst fears. These apparitions haunt him everywhere he goes. For example, he might see the ghosts of his fallen comrades or the villains he thought he had defeated, and he has to find a way to break the curse.
Fear of the past is a big theme. Haunted short stories often involve characters being haunted by events or people from their past. There's also the theme of isolation. In stories like 'The Yellow Wallpaper', the woman is isolated and this makes her more vulnerable to the 'haunting'. And death is a prevalent theme too. The idea of the dead coming back to haunt the living is quite common.
One common theme is fear. The haunted house setting naturally instills a sense of dread in the characters and readers alike. Another theme could be mystery, as there are often strange occurrences within the house that need to be unraveled. Also, isolation is often present, whether it's the physical isolation of the house itself or the emotional isolation of the characters who are trapped in this spooky place.
One major theme is the struggle for power. In 'hotaru naruto fanfic', Hotaru could be striving to become stronger, either to protect her loved ones or to prove herself. Also, the theme of loyalty is quite prevalent. She might have to choose between different groups or individuals and show her loyalty in various situations. For instance, she could be torn between her loyalty to her village and a new friend from another place. This creates interesting storylines.
One common theme is adventure. Since Naruto is always up for an adventure and Shion's powers can add an interesting element to their quests. For instance, they might go on a journey to stop a new evil force using Shion's prophetic abilities and Naruto's combat skills.