One interesting idea could be exploring the human version of Kyubey's complex moral compass. Since in the original, Kyubey's actions are often morally ambiguous. In a human Kyubey fanfiction, we might see how a human with similar characteristics struggles with ethical decisions. For example, a human Kyubey might have to decide whether to sacrifice a few for the greater good, just like the original character does when making magical girl contracts.
One interesting story could be that in human form, Kyubey is a student in a high school. He tries to secretly recruit girls for the magical girl system without them realizing his true identity at first. He befriends a group of girls who are interested in the supernatural, and as the story unfolds, they start to suspect something strange about him.
One common theme is deception. Since Kyubey is known for being manipulative in the original series, in human form he often uses his appearance to deceive others, especially when it comes to recruiting magical girls.
One interesting Homura x Kyubey fanfiction could be where Homura tries to understand Kyubey's true motives in a more in - depth way. Maybe she discovers some secrets about the Incubators that no one else knew before. For example, she might find out that Kyubey has a different side to his cold - hearted, utilitarian nature.
First, you need to understand the essence of the original Kyubey character. Know his motives, actions, and the way he interacts with others. For a human Kyubey, you can then translate those traits into a human context. For example, if Kyubey is cold - hearted in the original, a human version might be emotionally detached.
Maybe a story where a human engineer creates a highly intelligent robot. The robot becomes the human's closest friend and together they solve mysteries or go on adventures. The robot could have unique abilities that help them in their quests.
One idea could be exploring the life of a human who gains Saiyan-like powers through some scientific experiment gone wrong. They then have to learn to control these new powers while hiding their secret from the world.
A human to pokemon fanfiction could focus on a human being transformed into a Pokemon. They would have to learn how to survive in the Pokemon world, using their human knowledge to their advantage while also adapting to their new form. For example, a human turned into a Pikachu might use their understanding of electricity from a scientific perspective to control their electric attacks better. This could create a really unique and exciting story as they navigate their new life and interact with other Pokemon.
One idea could be a human who gains kaiju - like powers through a scientific experiment gone wrong. They then have to deal with the consequences of their newfound strength and the fear of society. Another could be a world where humans and kaiju co - exist, and a human befriends a kaiju and they go on adventures together. A third idea is a group of humans who have to fight off an invasion of kaiju using their wits and some stolen kaiju technology.
One idea could be a story where a mechanic has a special bond with a sentient car. The car has unique abilities and they go on adventures together, like solving mysteries in a post - apocalyptic world where cars are the key to finding resources.
One interesting idea could be a Dalek that has a malfunction and starts to develop human - like emotions. It might struggle between its programmed Dalek nature and these new emotions when interacting with humans.