One possible plotline could be that the OC is a new Asgardian who was overlooked before. Loki, after his experiences with Thor, meets this OC. The OC has some unique power that Loki wants to use for his own gain at first. But as they interact more, Loki starts to develop real feelings for the OC. They could go on adventures together, facing threats to Asgard and Loki has to choose between his old ways and protecting the OC and Asgard.
A great plotline could be that the OC is a healer who comes to Asgard after Thor has left on a long journey. Loki, who is still trying to find his footing in Asgard again, gets injured. The OC heals him and Loki is intrigued by this kind stranger. As time passes, they start to share secrets. Loki tells the OC about his insecurities regarding Thor and his past deeds. The OC helps Loki see that he can be more than his past mistakes and they fall in love, much to the surprise of many in Asgard.
One possible plotline could be Loki initially being angry and resentful towards Thor for hurting him. But as the story progresses, Thor's guilt drives him to make amends in a big way, like going on a dangerous quest to find a rare healing item for Loki. This could lead to a deeper understanding between them and strengthen their bond in the end.
One possible plotline could be that it's a magical accident. Maybe a spell gone wrong in Asgard causes this unexpected situation. Thor is initially shocked but then decides to be supportive. Loki, on the other hand, is more conflicted, dealing with his own emotions and how this will change his standing in Asgard.
Perhaps in the fanfiction, Darcy is from a different dimension where she has some special powers that are only awakened after she marries Loki. Their marriage could be a way to unite two different realms or powers. They then have to deal with the political and magical ramifications of their union, all while falling deeper in love and learning more about each other.
Love triangles are also quite common. The OC is usually caught in the middle between Thor and Loki, creating a complex web of emotions and relationships. This adds a lot of drama and tension to the story, as the OC has to navigate her feelings for both characters. It can lead to some really interesting character development and plot twists.
One possible plotline could be Loki's journey of self - discovery. After being abandoned as a child, he might struggle with feelings of unworthiness. Thor could then play a role in helping Loki realize his true potential. Maybe Loki initially resents Thor for having a more 'normal' upbringing, but as the story progresses, they come to understand each other better.
Well, a typical plotline might involve the OC's confusion upon reincarnation as Loki. They could find themselves in the middle of Asgardian politics, not understanding all the rules and power plays. Some stories may have the OC using their modern - world knowledge to outwit Loki's foes. And then there's the emotional side, like dealing with Loki's complex relationships, such as with Odin. The OC might try to mend those broken relationships in a different way than Loki would have.
One interesting Young Loki and Thor fanfiction could be about their adventures in Asgard as kids. Maybe they get into trouble while exploring a forbidden part of the realm.
Maybe Loki returns after being presumed dead. Thor is overjoyed at first, but then realizes Loki has some secrets he's been keeping. They have a tense but ultimately heartwarming conversation as they catch up on all that has happened.
One interesting story could be about Thor and Loki having to team up against a new, powerful enemy that neither of them can face alone. This forces them to put aside their differences and use their combined powers and wits to save Asgard.
There's 'Thor's Redemption in Loki's Arms'. In this story, Thor realizes his true feelings for Loki after a series of events that nearly tear Asgard apart. It's a tale full of emotion and character development.