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.
The OC might be terrified at first. After all, being kidnapped by Loki is no joke. But they could also quickly gather their courage. Maybe they would try to talk to Loki, to understand his motives. If the OC is smart, they would know that Loki has his own reasons for doing things and might be able to find a way to reason with him.
The OC can have a very independent personality. They don't rely on Loki or anyone else in Asgard for validation or protection. They have their own goals and dreams. For instance, the OC could be on a mission to learn about Asgardian culture and history, and they don't let Loki's charm or his attempts to derail them stop them. This independence makes them a strong character and a great counterpart to Loki as they can both be equals in their relationship.
A common theme is the struggle against fate. Since they are soulmates, there's often some kind of pre - ordained connection, but the characters, especially Loki, may resist it at first. For example, in many stories, Loki is hesitant to accept the OC as his soulmate due to his own trust issues.
Imagine a Loki OC who is a half - Asgardian, half - Vanir orphan. This OC has been living on the fringes of society, but Loki discovers their existence and decides to use them for his own schemes at first. However, the OC's pure heart and kind nature start to change Loki's perspective, and they end up on an adventure together to uncover a long - lost secret about their shared heritage.
Another theme is redemption. Sometimes Loki is in a state where he needs to redeem himself and the OC becomes a part of that journey. They help him see things in a new light and grow as a character. It makes for a very engaging read.
One common theme is the discovery of love. Usually, the OC and Loki start off in a somewhat unexpected way, like in a situation where they initially clash but then gradually fall in love. For example, they might meet during a battle or a political intrigue in Asgard.
First, develop your OC well. Give the character a distinct personality, appearance, and backstory. For example, if your OC is a shy mage, explain how they got their powers and what their goals are. Then, when it comes to Loki, stay true to his character traits. He's cunning and unpredictable. Incorporate these traits into the interactions between Loki and the OC. Also, create a good plot. It could be something as simple as them solving a mystery together.