One possible fanfiction could focus on Loki's struggle with always being in Thor's shadow. Since he is the little brother, he might feel overshadowed by Thor's popularity and heroic deeds. Loki could be trying to find his own identity and purpose, distinct from just being Thor's brother. This could lead to a story where he embarks on a solo adventure, facing challenges that force him to rely on his own wits and magic, rather than Thor's strength.
A fanfiction could explore the relationship between Thor and Loki in their childhood. As the little brother, Loki might be constantly teased by Thor in a good - natured way, but Loki takes it to heart. This could lead to a moment where Loki uses his magic to play a prank on Thor that goes too far. They then have to learn about forgiveness and understanding, which deepens their bond as brothers.
One common theme is envy. Loki may envy Thor's position, strength, and the love he receives from the people of Asgard. This envy can drive Loki to do things he might not otherwise do, like plot against Thor or try to prove himself in extreme ways.
Well, it could start with Loki getting physically and emotionally hurt by the taunts of the other Asgardians. Thor, noticing Loki's distress, steps in to protect him. He defends Loki in front of the court and makes it clear that Loki is his brother and should be treated with respect. Then, Thor takes Loki away to a quiet place where Loki can heal. He offers Loki comfort and support, and together they start to repair their relationship which had been strained in the past.
A fanfiction idea could be that Thor becomes overprotective of Loki when they are on a mission off - world. Loki is trying to use his skills to gather information but is in a dangerous area. Thor follows him closely, ready to fight off any threats. He might even go as far as to not let Loki out of his sight for a moment. This overprotectiveness could stem from Thor's love for his brother and his newfound understanding of Loki's importance in his life, as well as in the grand scheme of things in the Avengers universe.
Well, one possible plot could be that Thor and Loki's little sister has some special powers that are a mix of their own. She might be caught in the middle of their feuds, trying to bring peace between them. For example, she could use her powers to stop Loki from his mischievous plans that would anger Thor, while also making Thor understand Loki's motives better.
There could be various interpretations in such a fic. One possibility is that it shows Loki's complex character development. His childhood abuse might have led to his feelings of inferiority and envy towards Thor. For example, it could be used to explain why he sometimes acts out in a negative way, as he is constantly trying to prove himself after such a traumatic childhood.
One possibility is that the younger brother could be a source of both chaos and unity. He might be initially jealous of Thor and Loki's fame and power, causing some internal family strife. For example, he could try to outdo them in heroic deeds in a rather clumsy way, leading to comical situations. But in the end, when faced with a great threat to Asgard, he realizes the importance of family and uses his unique skills, perhaps some kind of hidden magic or strategic thinking, to help Thor and Loki save their home.
It could be Malekith. He might see the sister as a way to get to Thor and Loki and gain power over Asgard. Since she's a new and potentially vulnerable target, he could try to use her in his dark schemes.
Thor might initially go into denial. He can't believe that Loki is truly gone. He may hold Loki's body for a long time, as if waiting for him to come back to life. Then, he could become angry. Angry at the situation, at whoever or whatever caused Loki's death. Eventually, he may find solace in the memories of Loki. Remembering the good times they had together and using those memories to move forward.
It could strengthen their bond. They now have a common responsibility to protect and guide their younger brother. For instance, Thor might take on a more fatherly role, teaching him about honor and courage, while Loki could teach him some of his sly ways to outwit enemies, but also warn him of the dangers of excessive trickery. Their relationship could become more complex as they balance their own differences while raising the younger brother.
One plot idea could be that Baby Loki gets into some sort of magical mischief in Asgard while Thor tries to keep him out of trouble. For example, Loki might accidentally turn all the flowers in the palace gardens into snakes, and Thor has to figure out how to reverse it before the other Asgardians find out.