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 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.
The theme of redemption can also be found in some Homura x Kyubey fanfiction. Even though Kyubey has caused a lot of harm, some stories might explore the possibility of his redemption. Maybe through Homura's influence, Kyubey starts to see the error of his ways. Or perhaps Homura realizes that Kyubey is just a product of his species' nature and tries to find a way to change that nature, which could be seen as a form of redemption for both of them in a way.
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.
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 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.
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