One common theme is power dynamics. Since Loki is a powerful character, his possessiveness often plays into how he wields his power over the OC. For example, he might use his magic to keep the OC close or protect them in a way that shows his ownership.
Another one to check out is 'Loki's Territorial Love for the OC'. In this fanfiction, Loki's possessiveness is more on the territorial side. He sees the OC as his, and he's not afraid to show it. The story has a good plot that weaves in elements of Norse mythology along with the relationship between Loki and the OC, making it a really immersive read.
The character of Loki is complex, so in this type of fanfiction, it's important to stay true to his nature while also highlighting his possessiveness. The OC needs to be a well - developed character with their own backstory. This can influence how they react to Loki's possessive behavior. The fanfiction could also include elements of magic or mystery, as Loki is often associated with such things. For example, Loki might use his magic to keep the OC close. Another aspect is the emotional journey of both Loki and the OC. Their feelings for each other might change over time due to Loki's possessiveness and other factors in the story, and showing this evolution can make the fanfiction more engaging.
One reason could be that Loki sees something special in Peter. Maybe Peter has a unique power or a pure heart that Loki is drawn to, and he wants to keep that all to himself.
First, you need to create a well - developed OC. Decide on their personality traits, especially the ones related to possessiveness. Are they jealous easily? Do they have a strong sense of ownership? Then, think about the relationship with Hisoka. How did they meet? What draws them to Hisoka? After that, plot out the story. For the possessive part, you can have the OC react strongly to any perceived threat to their relationship with Hisoka. For example, if another character flirts with Hisoka, the OC could glare at them or even start a small confrontation.
In some fanfictions, Loki's possessiveness of Peter can be seen in the way he protects him. He'll go to great lengths to keep Peter out of harm's way, but not just because it's the right thing to do. It's also because he sees Peter as his own. He might be overbearing at times, not allowing Peter to take risks on his own, which shows his possessive nature.
Another theme is self - discovery. The OC, who is often an outsider or someone with a unique background, also goes through a journey of self - discovery while interacting with Loki. They both learn about themselves and their capabilities through their relationship.
There's this 'Loki x OC Fanfiction' called 'Love in the Shadows'. The OC in this story is a thief with a heart of gold. She accidentally steals from Loki and that's how their story begins. It's full of witty banter between them. The author has created a really unique OC who is not intimidated by Loki's power and status, which makes for a very engaging read.