Perhaps the wounded or those who are recovering from battles could be recipients. The dolls could serve as a form of comfort, a little token to cheer them up during their difficult times.
One interesting aspect could be the creativity in imagining Naruto's new skill or hobby of making dolls. It might show a different side of his character, perhaps a more artistic and patient side compared to his usual ninja activities.
The unique combination of the Diamond Dolls concept with the Twilight world makes it special. It brings in new elements and characters that can change the dynamics of the original Twilight story.
Well, it could be that in this fanfic, Harry Potter has a new idea to combat the villains in his world. He decides to make spy dolls. These dolls could be enchanted with special spells that allow them to move around unnoticed, perhaps they can blend into their surroundings like a chameleon. They might be sent into dangerous places where it's too risky for real people to go, like the lairs of dark wizards. And they could send back information to Harry and his friends, which would help them in their fight against evil.
You can try searching on popular fanfic websites such as Archive of Our Own (AO3) or Fanfiction.net. Just type in the title or relevant keywords and see if it pops up.
The idea of inanimate objects coming to life is a big factor. We expect dolls to stay still and lifeless. When a story suggests they can move, talk, or have a malevolent will of their own, it goes against our normal perception. Also, dolls are often associated with childhood innocence, and when that is perverted in a horror story, it creates a strong sense of unease. In many horror dolls stories, they are used as vessels for evil spirits or curses, which adds to the scariness.
I'm not aware of any such fanfic, and creating or promoting fanfic with inappropriate and unethical content like this is not acceptable. Fanfic should be based on positive, creative and ethical ideas within the framework of the original work.
Perhaps Naruto makes the robot as a tool to help around the village. It could assist in construction, or in taking care of the elderly and the young. Since Naruto is always looking out for the well - being of his village, a robot could be a great addition.
Dolls can be really creepy in scary stories because they often look like people but are not. Their still faces and glassy eyes can seem very strange, especially in a spooky context.