The theme of isolation is often seen in Kilgrave fanfic. Despite his power, he is a very lonely character. Fanfics may show how this isolation affects him and whether he tries to break out of it. Additionally, the idea of resistance against his power is common. There are characters in fanfics who try to resist his mind - control, which leads to interesting power struggles and stories of survival and defiance.
Some Kilgrave OC fanfictions focus on the emotional aspect. The OC could be someone who has a personal vendetta against Kilgrave because he hurt their family. But instead of going for immediate revenge, they try to understand him first. This exploration of the complex relationship between the OC and Kilgrave, with all its moral and emotional gray areas, makes for a great read.
There's a Kilgrave fanfic called 'The Unseen Side of Kilgrave'. It delves deep into his past, his childhood perhaps, and how those experiences shaped the person he became. It gives a more in - depth understanding of his character, rather than just focusing on his villainous actions. Also, 'Kilgrave's Allies' is an interesting one where he forms unexpected alliances, which is quite different from the usual portrayals of him as a lone, controlling figure.
First, understand Kilgrave's character well. Know his powers, his motives, and his weaknesses. Then, create an OC that has a clear backstory and personality. For example, if your OC is a strong - willed person, show how that trait interacts with Kilgrave's control. Also, make sure the plot has a good flow and a clear goal. Maybe the OC is trying to stop Kilgrave from taking over the city or something similar.
One popular fan fiction could be 'Breaking the Chains'. It delves deep into Jessica's journey of recovery from Kilgrave's abuse. It shows how she slowly rebuilds her life and overcomes the psychological trauma he inflicted. Another one might be 'Beyond Kilgrave's Control' which focuses on the power dynamics and how Jessica finally takes back control of her own narrative.