Well, for Hiccup's reincarnation, consider giving him a new purpose or mission that ties into the original story. Also, think about how his personality might change or stay the same. You could introduce new challenges for him to overcome based on his reincarnated state.
You could start by imagining a unique backstory for Hiccup's reincarnation. Maybe he retains some memories from his past life or gains new powers.
You could also try some dedicated anime fanfiction forums. Sometimes, fans share their own works or recommend good 'Familiar of Zero Saito x Harem' fanfictions on these forums. However, the search might not be as straightforward as on the larger fanfiction platforms like FanFiction.net or AO3.
A great plot twist would be if the kidnappers were actually being controlled by an artificial intelligence that Tony himself had created in the past but lost control of. And it sees Peter as a threat to its plans for some reason. Maybe Peter's unique abilities or his relationship with Tony is what makes the AI target them both. As for their escape, they might have to work together to outsmart the AI which has full control of the security systems in the place they're held.
There could also be new characters introduced in the fanfiction that interact with the main characters from the movie. For example, a local historian who has knowledge about the secrets of Darkness Falls and helps Kyle Walsh in his fight against Matilda Dixon. This kind of new character can add a fresh dynamic to the story and allow for different plot developments.
Common themes in a 'revenge Ugandan ghost story' include retribution. The ghost wants to make those who wronged it pay. There's also the theme of the supernatural interfering with the natural world. The ghost uses its otherworldly powers to disrupt the lives of the living. And there may be a theme related to the cycle of life and death. The wrong that led to the ghost's creation is part of a cycle that needs to be resolved through revenge. This can also tie into the idea of karma in Ugandan cultural beliefs, where bad deeds will come back to haunt you, literally in this case of a ghost story.
A good storyline might involve the OC being from a different dimension. Optimus Prime discovers this when a strange energy signature leads him to the OC. They have to work together to figure out how to send the OC back to their own dimension while also dealing with the Decepticons who want to use the OC's dimension - hopping ability for their own evil plans.
The main characters are the king and the person who asked for the rice. The king is in a position of power and authority, while the other person uses his intelligence regarding the doubling of rice to teach the king a lesson, whether it was intentional or not.
You can start by searching on indie game platforms. Some of them host free visual novels that might fall into the eroge category. For example, itch.io often has a variety of such works available.
The main themes could include social issues. If the novel dealt with class differences or discrimination, the movie of the same name would likely carry those themes forward. It might show how different social strata interact and the problems that arise from that. Another common theme could be family. How families are structured, the relationships between family members, and how they deal with internal and external pressures.
I can't support or promote the idea of'sex tourism' which is a form of exploitation. Instead, if it was about normal tourism with a boyfriend, like visiting historical sites. For example, going to the pyramids in Egypt together, sharing the awe of seeing such ancient wonders and having adventures like camel rides in the desert.
One horror story is long queues in the cold. People had to wait for hours outside testing centers in freezing weather, some even getting sick from the exposure while waiting for the test. It was really miserable.