In this fanfiction, Haku might be searching for a way to bring some of the beauty of the human world back to the spirit world. He travels across different cities, seeing various forms of art, architecture, and nature. Along the way, he meets a botanist who teaches him about plants. Haku then decides to try and create a garden in the spirit world inspired by what he has seen in the human world. He faces many challenges in transporting the plants and knowledge, but with his determination, he tries his best to make it happen.
One possibility could be that Haku, having finally found a way to the human world, tries to adapt to modern life. He might struggle with things like technology. For example, he could be fascinated by cars but also a bit scared of them at first. He would also have to deal with the different social norms in the human world. Maybe he would make a human friend who helps him understand the world better.
One idea could be a story about Haku and Chihiro reuniting in the spirit world years later. Chihiro has grown up but still remembers Haku vividly. Another could be a fanfiction where they go on an adventure together outside of the bathhouse to explore other parts of the spirit realm that were previously unknown to them.
One plot idea could be that the OC is a spirit from a different part of the spirit world who comes to Yubaba's bathhouse. Haku is immediately intrigued by this new spirit and they start to form a bond as they both deal with the chaos in the bathhouse. Another idea is that the OC has a special power that can help Haku break free from Yubaba's control, leading to a journey of self - discovery for both of them.
A fanfic could focus on a journey that Haku and Chihiro take together within the spirit world that they didn't get to do in the movie. They could face new challenges and in the process, their relationship deepens as they rely on each other for support.
One idea is that Chihiro gets trapped in a different part of the spirit world and Haku has to use all his powers to find her. Along the way, he realizes just how much she means to him.
I'm not entirely sure if there is a specific fanfiction about Haku and Chihiro getting pregnant. While Spirited Away has a huge fan base and a lot of fan - created content, this particular topic might be a bit controversial as it goes against the rather innocent and magical nature of the original film. But it's always possible that in the corners of the fanfiction community, someone has explored this idea. You may need to dig deep into the search engines dedicated to fanfiction to find out.
One idea could be a fanfiction that focuses on what happened to Haku after Chihiro left the spirit world. Maybe he had to face new challenges or make difficult choices. Another could be a story about Chihiro returning to the spirit world as an adult, but finding it completely changed. And a third idea could be a fanfiction that delves into the backstories of the minor spirits we saw in the movie, like the soot sprites and how they came to be in the bathhouse.
One great fanfic could be 'Chihiro and Haku's New Adventure'. It might explore their relationship further after the events of the movie, like them exploring new parts of the spirit world together.
One possible plot could be that the kiss is a moment of realization for both Chihiro and Haku. It might be a way for them to break a spell that has been holding Haku in some sort of limbo. After the kiss, Haku could start to remember more of his true self and his past, which could lead to him being able to finally leave the spirit world and find peace. And for Chihiro, it could be a sign of her growing up and understanding her feelings in this strange world she has found herself in.
Yes, Fanfiction.net also has a good selection. Look for ones with high ratings and a lot of reviews. A common theme in these fanfictions is the OC helping Haku remember his true identity while falling in love with him. The writers usually describe the spirit world in great detail, making it an immersive experience for the readers as the Haku x OC relationship unfolds.