Well, in some fanfictions, he might get it from a skilled ninja prosthetics maker. This maker could be someone who specializes in creating artificial limbs for ninjas who have lost their arms in battle.
One common theme is adaptation. Naruto has to adapt to having a fake arm, whether it's in combat, training, or daily life. Another theme is often power - up. The fake arm might give him new abilities or enhance his existing ones. For example, it could be a super - strong arm made of some rare material that lets him punch through walls or something.
It could have enhanced strength. Since Naruto is already quite strong, the fake arm might be designed in the fanfiction to multiply his physical power, allowing him to punch even harder or hold heavier objects.
One interesting Naruto fake arm fanfiction could be one where Naruto gets a special prosthetic arm after a battle. It might have unique abilities, like being able to channel chakra in new ways. Maybe it was crafted by a hidden master. Another could focus on how he adjusts to having a fake arm in his daily ninja life, dealing with tasks that were once easy but now are a challenge.
It's a horror story that often involves a golden arm with some spooky or supernatural elements. Usually, there's something terrifying associated with this golden arm, like it being cursed or having a dark past.
A long time ago, a wealthy merchant had a beautiful golden arm. It was a gift from a mysterious stranger. But the merchant was cruel. One night, a poor beggar asked for help and the merchant refused. The beggar cursed him. From that day on, the merchant's golden arm became a source of horror. It would move on its own and try to strangle him at night. The more he tried to get rid of it, the tighter it gripped him. In the end, he was found dead in his bed, with the golden arm still wrapped around his neck.
Japanese horror stories often have unique and terrifying elements. When it comes to stories specifically related to the left arm, they might involve themes like cursed body parts. For example, there could be a story where a character's left arm starts to act on its own, perhaps with a strange mark on it that is the sign of an ancient curse. This could lead to all sorts of spooky happenings, like the arm reaching out for things in the dead of night without the person's control.
Sorry, I'm not sure which novel or movie you're referring to. However, from what I know, The Fake Eunuch in the Harem is not a common novel or movie because its plot and theme are usually not adopted by movies or TV series. If you have any other questions about movies or novels, I will try my best to answer them.
Since there are different tellings of the 'the golden arm horror story', the main characters could be a curious explorer who stumbles upon the golden arm. Then there might be an old hag or a dark wizard who has a connection to the arm. Maybe the explorer's friends who also get involved in the mystery of the golden arm and face the horror it unleashes. It really depends on how the story is crafted, but these are some of the common types of characters that could be involved.