Kagome is an obvious choice. She has a strong bond with Inuyasha already, and when he turns human, their relationship could take on new dimensions. She might have to be more protective of him, or they could have different kinds of interactions. Miroku is also interesting. His wisdom and his own goals could play a role in helping Inuyasha deal with being human. He could offer advice on how to handle the new situation, or he might have some knowledge about the cause of Inuyasha's transformation.
One common theme is the power of their relationship. Their bond, which is a mix of friendship, love, and mutual respect, is often explored. For example, how they support each other in battles against demons.
There is also 'The Bond of the Jewel'. This fanfiction delves deep into how the Shikon Jewel affects their relationship. It shows how they rely on each other to protect the jewel and in the process, their bond grows stronger. It has some great character development for both of them.
These alliances can also be a source of character growth. A human character might start off being afraid of demons but through an alliance, learn to see them in a different light. Similarly, a demon might gain a new perspective on humans. In some fanfictions, the alliance might even lead to a change in the social structure of the Inuyasha universe, with humans and demons starting to co - exist more peacefully. This is often a long and difficult process as there are many prejudices on both sides to overcome.
There could be a fanfiction where Inuyasha in his human form has to protect a village from a new threat. Since he doesn't have his full demon powers, he has to rely more on his wits and the help of his human friends. This would show a different side of his character, more vulnerable and yet determined.
There might be a fanfiction where Inuyasha and Kagome are re - imagined as completely human from the start. In this version, they meet in a small village and their relationship develops as they work together to protect the village from bandits and other threats. They have to rely on their wits and human strength rather than any demon abilities.
Fanfiction.net is also a great place to find Inuyasha human form fanfiction. There are different categories and filters you can use to narrow down your search. Just be aware that the quality can vary, so you might need to read a few to find the really good ones.
Another aspect is the moral gray area. Demons in the fanfiction might not be all - bad, and humans might not be all - good. This creates a complex web of relationships. Some demons might be forced into bad actions due to their nature, and humans might have to decide whether to show mercy or not. It makes for very engaging storylines as characters navigate these moral dilemmas in their relationships.
A good plot could involve Inuyasha turning human at unexpected times. This creates a lot of chaos as his friends are used to his demon form. For instance, they might be in the middle of a battle with a powerful demon, and suddenly Inuyasha turns human. His friends then have to protect him while also trying to figure out how to turn him back. It could also be interesting if his human form has some sort of hidden power or connection that they discover during this time.
In these fanfictions, their relationship can be seen as a journey of self - discovery. Since they are both in a more human context, they learn about each other's personalities in a different light. For example, Kagome might discover that Inuyasha has a hidden talent for painting when he is human, which deepens their connection.