One interesting plot twist would be that Loki's dark circles are a connection to a parallel universe. In this fanfiction, whenever the circles appear, Loki can see glimpses of this other world. He tries to find a way to fully access it, believing that there might be something there that can help him regain his rightful place in Asgard. He teams up with a seer in Asgard who can help him interpret the visions he gets from the dark circles.
A plot twist could be that Loki's dark circles are actually a sign of a hidden power. In the fanfiction, as Loki discovers this, he has to learn to control this new aspect of himself. It could be that the darker the circles, the more powerful he becomes, but he also risks losing his sanity if he doesn't master it.
One idea could be a fanfiction where Loki uses his magic to cover up his own dark circles. Maybe he's been up all night plotting against Thor and is trying to look his best in front of the other Asgardians. He could accidentally create a spell that gives everyone in the palace dark circles instead.
Another plot twist could be that the reader has some sort of power or knowledge that Loki needs. So, instead of a malicious kidnapping, it's more of a strategic move on Loki's part. He might be trying to bargain with the reader to get what he wants, but as time passes, he starts to develop feelings for the reader.
One possible plot twist could be that Loki actually has a noble reason for kidnapping Tony. Maybe he wants to use Tony's intelligence to stop a greater threat that the other Avengers are unaware of. For example, there could be a hidden enemy that Loki has knowledge about, and he believes only Tony can help create a device or strategy to defeat it.
A possible plot twist could be that Loki was actually working with Thanos all along, but faked his death to deceive the Avengers. This would change the whole dynamic of the story and lead to a new set of conflicts. Another twist could be that Loki's survival was part of a grand plan by Odin (who might not be truly dead) to stop Thanos from getting all the Infinity Stones.
Maybe Loki adopts Percy because he sees in Percy a power that could be useful for his own plans. But as time goes on, Loki actually starts to care for Percy like a real son. This would change Loki's character development throughout the fanfiction. He might start to make decisions that benefit Percy more than his own self - interested motives, which would be a huge shift for his character.
Well, a plot twist could be that Loki kisses Darcy as a way to gain access to something she has. Like, she has a key or a piece of information that he needs. But then, he actually starts to develop real feelings for her during the process. It adds an interesting layer of conflict, between his initial motives and his newfound emotions.
In this fanfiction, it could be that Loki was misled into thinking the girl was an enemy spy. So, he kidnaps her to interrogate her. However, during the interrogation, he discovers she's completely innocent. Now, he has to figure out how to make up for his mistake without losing his pride, and also deal with the potential chaos that his hasty action has caused among her friends and family.
Well, a common plot twist is when Kid Loki turns out to be the only one who can understand an ancient prophecy that involves the Avengers. This throws the whole team into chaos as they have to rely on him to figure out their next moves. Another plot twist could be that Kid Loki's mischievous acts were actually a way to test the Avengers' loyalty and strength, and in the end, he unites them in a way no one expected. Also, he might be able to transform into a powerful being that the Avengers initially thought was a different entity, and this revelation changes their battle plans entirely.
One possible plot twist could be that the baby has some sort of super - power that neither Loki nor Valkyrie expected. Maybe it can control time like Loki but also has the strength of a Valkyrie. This could put the baby in danger as various forces in the universe would want to either use or destroy it.
Well, a plot twist might be that Loki and Sif's marriage is part of a grander scheme by Odin. He wants to unite two powerful families in Asgard to face an upcoming threat. However, Loki and Sif don't know this at first. As they start their married life, they face many challenges together, like dealing with jealous courtiers. But as they uncover the truth about Odin's plan, they decide to embrace their roles and lead Asgard to safety.