One idea could be a castle that floats in the sky in the alternate universe. It could be made of some kind of magical crystal that gives it the ability to levitate. The inhabitants of this castle might be a race of winged beings who use the castle as a base to protect their realm from dark forces.
Well, in the world of 'alternate universe fanfic', for shows like 'Doctor Who', there could be an AU where the Doctor is a human instead of a Time Lord. In 'Sherlock' AUs, Sherlock and Watson might be in a steampunk universe. And for 'The Hunger Games', an AU could be that there is no Hunger Games at all and the districts live in a utopian society.
There's also 'Batman in a Cyberpunk Alternate Universe'. This fanfic takes Batman into a high - tech, dystopian future. Bruce Wayne uses advanced cybernetic enhancements and battles against tech - savvy villains in a neon - lit Gotham filled with skyscrapers and flying cars.
In this 'naruto alternate universe naruko fanfic', apart from Naruko, Kakashi could be a significant character. He might be Naruko's mentor, guiding her through her ninja training. And Hinata could be another main character. Maybe she has a special connection with Naruko, like they are on a joint mission to protect the village from a new threat. Additionally, there could be new characters created specifically for this alternate universe who interact closely with Naruko.
A good plot. For example, if it's an alternate universe where Tim Drake is a vampire, the story should have a well - thought - out plot around his new identity. It should also stay true to his core character traits to some extent.
One interesting concept is the re - imagining of characters. For example, in an alternate universe, a classic hero could be a villain. Another concept is the different power structures. Maybe magic is used in a completely new way, like being a currency instead of a weapon. Also, the alternate social hierarchies can be fascinating. A race that was once oppressed could be the ruling class.
One interesting concept is the idea of meeting alternate versions of oneself. It can lead to self - discovery and exploring different personalities. Another is the discovery of unique cultures and societies in the alternate universes. For example, a world where magic is the norm instead of science. And then there's the concept of changing the course of events in an alternate universe, which can have far - reaching consequences.
First, choose the original story or universe you want to base it on. Then, decide on the major change for your alternate universe. For example, if it's a superhero story, you could change the origin of the powers. After that, start building your new world and how the characters fit into it.
You could start with a character from our world being mysteriously transported to the alternate universe and finding the castle. For example, a young archaeologist who was exploring an ancient ruin suddenly finds themselves in front of this magnificent castle. They then have to figure out how to get inside and what secrets the castle holds. This could lead to encounters with strange creatures and uncovering a plot that threatens both the castle and the alternate universe.
One interesting concept could be a Naruto AU where the main characters have different elemental affinities. For example, Naruto might be a water - type user instead of wind. Another concept could be a world where the Akatsuki are the heroes. They could be fighting against an oppressive regime that the Hidden Villages support. Also, a fanfic could explore a Naruto AU where the tailed beasts are free and coexist peacefully with humans from the start.