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.
A cool concept for a Corpse Party fanfic could be a time - travel story. Imagine a character somehow going back in time to before the events at Heavenly Host Elementary. They could then try to prevent the initial tragedy that led to the school becoming haunted, like stopping the earthquake that killed all those students in the first place.
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 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 idea could be a mystery adventure where Corpse and Sykkuno team up to solve a virtual riddle in a game world. They use their unique skills, Corpse's deep voice and strategic thinking, and Sykkuno's friendly and observant nature to crack the mystery.
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.
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.
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 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.
For a Naruto birthday party fanfic, you could write about a time - travel themed party. Naruto accidentally gets sent back in time to the day he was born. He meets his parents and all the people who were important in his early life. They all celebrate his birth together, and Naruto gets to experience a new side of his family and the village's history. Or perhaps a party where the whole village turns into a giant ninja - obstacle course for Naruto's birthday. Everyone competes in the course, and Naruto has to overcome all the challenges his friends and villagers set up for him.
How about an art - themed birthday? Set up different art stations with painting, clay - making, and drawing. The kids can create their own masterpieces to take home as party favors. You can also have a big mural that all the kids contribute to as a group activity.
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.