A prevalent theme is the clash of different natures. Loki, being a god or a powerful being, has a different way of thinking compared to the ordinary prisoners. The OC, whether they are a prisoner or have some other role, brings in their own perspective. This leads to interesting interactions as they try to work together. Also, the theme of power dynamics is often explored. Loki's power is either a hindrance or a help in the prison environment, and the OC may have their own hidden powers or skills that shift the balance. There's also the theme of trust. In a prison full of secrets, Loki and the OC have to decide who to trust and when, which adds a layer of complexity to the story.
One common theme is redemption. Loki often has to face his past actions and find a way to make amends while in the prison setting. Another theme is mystery. There are usually unsolved cases or strange happenings within the prison that Loki and the OC are trying to figure out.
There's a fanfic titled 'The Prisoner and the Detective Loki'. In this one, the OC is a prisoner who has some unique abilities. Loki, as the detective, is intrigued by this prisoner and starts to dig deeper. It has a really interesting dynamic between Loki's godly nature and the prisoner's down - to - earth but mysterious personality. The story builds up the suspense gradually and keeps you hooked till the end.
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.
I can't really say for sure as it's a rather specific and perhaps not so common type of fanfic. But it might involve themes of power dynamics, given Loki's character often has an air of power and mystery. The relationship between Loki and the original character (oc) could be explored in terms of dominance and submission.
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.
One common theme is the relationship between Loki and the OC. It could be a friendship, a mentorship or even a romantic 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.
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.
One common theme is the power of love to change Loki. In many of these fanfictions, the OC's love helps Loki to become a better version of himself, or at least to see things from a different perspective.
One common theme is the unexpected nature of the pregnancy. It often creates a lot of drama and tension in the story. Another theme could be Loki's reaction to the situation. Some stories might show him being protective, while others could depict him as initially confused or even resistant.
One common theme could be forbidden love. Since Loki is often portrayed as a complex and somewhat of an outcast character, a relationship with an original character in a 'lemon' context might involve a sense of secrecy or something that goes against the norms. Another theme could be power dynamics, where Loki's power plays a role in the relationship with the OC.