Archive of Our Own (AO3) is also a great place. There are many well - written and diverse fanfics about this series there. You can search by tags related to the series to find the ones that interest you most.
You can start by looking on fanfiction.net. It has a large collection of fanfics for various series, including Fate Kaleid Liner Prisma Illya.
One great fanfic could be 'Illya's Adventure in the Magic World'. It explores Illya's journey in a new magical realm with unique challenges and character development.
The light novel follows Illya, who becomes a magical girl. She gets involved in various adventures, often related to the Holy Grail War in a different context compared to the main Fate series. There are battles against other magical entities, and she also has to deal with her own growth as a magical girl and her relationships with the other characters.
The main character is Illya. She is a young girl who becomes a magical girl. Ruby is also important as she is the Kaleidostick that helps Illya in her magical girl activities. Miyu is another significant character, who has her own secrets and plays an important role in the story.
It's about Illya, who becomes a magical girl. She gets involved in various adventures and battles. There are also elements related to the Fate series' lore.
The main character is Illya. And there is also Miyu.
You can combine the traits of different characters from the Fate Kaleid Liner series. For instance, take the magical abilities of one character and the personality of another. This will result in a new and unique character.
Maybe a time - travel based crossover. A character from Fate Kaleid Liner accidentally travels back in time and meets the younger versions of other characters in the series. This could lead to changes in the timeline and they would have to work together to fix any potential disasters that their meeting has caused, all while trying to find a way back to their own time.
Another place to check could be FanFiction.net. Although the site has a wide range of content quality, with some searching and filtering, you might be able to locate some interesting 'illya x napoleon fanfic'. There are also some niche fandom - specific forums where fans might share their own written works or recommend good fanfics.
You can find 'illya x shirou fanfic' on FanFiction.net. There are a lot of stories there dedicated to this pairing. Just search for their names in the search bar and you'll get a bunch of results.
Another place could be FanFiction.net. Although it has a wide range of content, you should be able to find 'fate lemon fanfic' by searching for relevant keywords. However, make sure to follow the site's rules and regulations.