You could create an OC who is a paranormal investigator. They hear about the rumors of Heavenly Host and decide to go there with their team to document any supernatural activity. However, once inside, they quickly realize that the situation is far more dangerous than they ever imagined. Their scientific knowledge and equipment might initially seem useful, but as the true nature of the place reveals itself, they have to rely on their wits and the help of any survivors they meet.
One idea could be exploring the backstories of the minor characters. For example, you could write about how a particular student ended up at Heavenly Host Elementary in the first place. Another idea is to create an alternate ending where the characters manage to escape the horrors of the school in a different way than in the original. Maybe they find a hidden passage that leads them directly out, but it has its own set of challenges.
One idea could be that Satoshi and Yuka get separated from the rest of the group in the haunted school. As they try to find their way back, they encounter strange apparitions that seem to be connected to Yuka's past traumas. Another plot could involve Satoshi having to protect Yuka from a malevolent spirit that specifically targets her because of her innocent and pure nature. Maybe they find a hidden room in the school filled with old diaries that reveal secrets about the place and help them understand how to escape.
One of the common themes is friendship. Even in the midst of all the horror, the original characters in the 'corpse party oc fanfic' often form bonds with other characters. They rely on each other to get through the terrifying situations. Also, mystery is a big part. The fanfics usually explore the secrets of Heavenly Host through the eyes of the OCs.
One interesting crossover could be the use of Hogwarts' magical elements in the haunted setting of Corpse Party. For example, a spell from Harry Potter might be used to fend off the malevolent spirits in the Corpse Party world.
One interesting feature is the intense and spooky atmosphere. It really draws you into the horror setting. The character development is also quite good, making you care about the fates of the characters. Another feature is the branching storylines which offer different outcomes depending on the choices you make during the game.
There is a 'corpse party oc fanfic' called 'OC's Struggle in Corpse Party'. In this fanfic, the original character has to face all the terrifying situations in the game world. The author does a great job of portraying the psychological state of the OC. It also makes use of the game's atmosphere and lore effectively, making it a very immersive read for Corpse Party fans.
Well, in a Naruto party fanfiction, you could have a themed party based on a specific clan. For example, a Uchiha - themed party where there are red and black decorations everywhere. The characters could exchange stories about the Uchiha clan's history. Or perhaps a party to honor a new Hokage, with the whole village coming together and having a big feast with all the traditional Naruto dishes.
Start with a backstory. Maybe your OC has a troubled past, like they were bullied in school before, which gives them a certain resilience in the face of the bullies - like spirits - in Heavenly Host. Also, consider their appearance. For example, they could have a unique piece of jewelry that has some significance, like it was a gift from a deceased loved one that gives them a sense of comfort and strength in the terrifying environment.
The unique plotlines are a great feature. It doesn't follow typical horror clichés all the time. It weaves in elements of mystery and psychological horror. For example, the way the different 'worlds' are presented in the story keeps you guessing. Also, the art style, which is often dark and moody, suits the horror theme well.
One idea could be that Naruto accidentally stumbles upon the world of the corpse bride while on a mission in an ancient, haunted forest. He discovers that the corpse bride was once a kunoichi from a long - lost village, and he tries to help her find peace by solving the mystery of her death.