Fanfiction related to 'Flushed Away' is basically stories written by fans. It could be about the adventures of Roddy and Rita in new scenarios not shown in the movie. Maybe new heists they go on or different challenges they face in the sewers.
Some specialized animation - focused fan communities might also have 'flushed away fanfiction'. These could be forums or groups dedicated to the movie. You might need to search around a bit, but they could be a good source. Additionally, you can do a simple Google search with the keywords 'flushed away fanfiction' and see what comes up. Just be careful to check the credibility of the sources.
Since I haven't read the 'a weekend away novel', I can't say for sure who the main characters are. But perhaps there could be a young couple who want to rekindle their relationship during a weekend away. Or it could be a single person trying to find some peace and self - reflection during their weekend getaway.
I don't know specifically as I haven't read it. But usually in a novel about a weekend away, there could be a protagonist who initiates the trip, perhaps a young adult looking for some time off.
I don't know for sure since I'm not familiar with this specific 'far away visual novel'. But typically in visual novels, there are often interesting characters. There could be a brave hero or heroine who is on a journey in the far - away world, a mysterious guide who helps them along the way, or a villain who tries to stop them from achieving their goals.
Chihiro is very interesting. She starts as a scared little girl but transforms into a brave and determined person throughout the story. She has to adapt to the strange spirit world and fight for her family.
Since I don't know the exact story, it could be parents if it's a family - related situation. Maybe a mother or a father who has to take the children away for some reason, or it could be social workers if they are taking children away due to family problems.
Obviously, Harry would be one of the main characters. But there could also be new characters that the author creates for the story. Maybe there's a wise old wizard who takes Harry under his wing in the new place he moves to.