Well, a common plot in such fanfiction is Loki getting into academic rivalries with the smart Avengers members, like Tony Stark or Bruce Banner. Maybe there's a science fair at school, and Loki tries to outdo them with his own brand of magic - disguised as science, of course. Also, there could be a plot about Loki being forced to join a school club with the Avengers, like the drama club. He might initially resist but then find that he enjoys it and forms unexpected friendships along the way.
Some plotlines might include Loki causing chaos during a high school dance. He could use his magic to make the decorations go wild or the music play strange tunes. Or perhaps there's a school trip where the Avengers and Loki are all together, and Loki gets lost on purpose to make the others search for him. This could lead to some interesting character development as the Avengers try to understand Loki better and Loki might start to see them in a different light.
One popular plotline could be Loki being the new student in high school where the Avengers are also students. Loki might initially try to cause trouble, like pranking the other students or trying to steal something important for a school event. Another plotline could involve a school competition where the Avengers and Loki are on opposing teams, and they have to learn to work together in the end. And there could also be a plot where Loki has a secret crush on one of the Avengers and tries to hide it while still being his mischievous self.
Another plotline might involve Loki getting caught in a time - loop within an Avengers - related adventure. He keeps reliving the same day, and each time he has to interact with the Avengers in different ways to try and break the loop. This could lead to some really comical and also tense situations as he tries to figure out what's going on while the Avengers are getting increasingly suspicious of his behavior.
One plotline could be Loki initially resisting the Avengers' attempts to adopt him. He might be suspicious of their motives, thinking it's a trick. But over time, as they show genuine care, he starts to open up. For example, Thor could be a key factor in getting Loki to trust the Avengers, as he vouches for their good intentions.
Often, there's a plotline where Loki has some inside knowledge about an enemy that the Avengers are facing. Maybe he has some past connection with the villain. So, he becomes a key source of information. There could also be a plot where Loki's presence in the Avengers causes some internal conflict within the team. Some members don't trust him, while others see his potential. This conflict and how it's resolved is a common plotline too. And sometimes, Loki might get kidnapped or held hostage by the enemy because of his new - found alliance with the Avengers, and the team has to rescue him.
One possible plotline could be that future Loki comes with a warning about a new threat that the Avengers initially don't believe. For example, he might tell them about a powerful being from another dimension that is slowly making its way to Earth. Another plotline could involve future Loki trying to redeem himself in the eyes of the Avengers by helping them prevent a disaster that he was partly responsible for in his own timeline. He could use his knowledge of magic and trickery to outwit the new enemy.
A typical plotline in Loki deaged fanfiction is Loki being deaged due to some magical mishap. This then leads to him being in a situation where he has to rely on others, which is a big change for him. For instance, he might have to rely on the Avengers (if it's set in that universe) for help. Another aspect could be that deaged Loki has to face his insecurities from his childhood all over again. This can be really interesting as it shows a different side of Loki, a more vulnerable side that we don't often see in the original stories. There are also fanfictions where deaged Loki tries to regain his old age as quickly as possible while still causing some trouble along the way.
Well, in some Ash Ketchum high school fanfictions, there's a plotline where Ash is given the task of training a group of beginner Pokémon trainers in the school. He has to use his own experiences to teach them, which is not easy as they all have different personalities. Also, there could be a plot where Ash is framed for something he didn't do in the Pokémon - related incidents at school, and he has to prove his innocence while still focusing on his Pokémon training and studies.
One popular plotline could be Gaara and Sakura being paired as partners for a school project. They start off not getting along because of their different personalities. Gaara is quiet and reserved while Sakura is more outspoken. But as they work together, they begin to understand each other better and develop a friendship that might turn into something more. Another plotline could involve a school competition where they are on opposing teams. Despite the rivalry, they find respect for each other's skills. A third plotline could be about Gaara being a new student at the high school and Sakura being the one assigned to show him around. Through this, a bond forms between them.
Some plotlines involve Gray and Lucy in a high school mystery. Maybe there are strange things happening around the school and they team up to solve it. Along the way, they rely on each other's strengths. Gray's cool - headedness and Lucy's intuition. Or perhaps there's a school club that they both join, like a magic club or an astronomy club. As they participate in club activities, they bond over their shared interests. There could also be a plot where a new student arrives at the high school and tries to come between Gray and Lucy, but their friendship/relationship is strong enough to withstand it.
A very common pairing is Loki and Thor. In a high school setting, Thor could be the popular jock type while Loki is the more brooding, artsy kid. Their brotherly dynamic would be interesting to explore in this context. Another popular pairing could be Loki and Natasha Romanoff. She might be the one to see through Loki's tricks and they could have a sort of cat - and - mouse relationship that slowly turns into something more. And of course, Loki and Tony Stark could be paired up. Stark's sarcasm and Loki's mischief would make for some great banter.
Some popular themes include Loki's growth and development. In a child form, he can experience things in a more innocent way. His learning about teamwork is a big one. The Avengers could be teaching him how to work together for the greater good. Also, there could be a theme of Loki dealing with his past mistakes, even as a child. Maybe he has flashbacks to his more villainous actions and tries to make amends, which creates an interesting dynamic within the Avengers - centered fanfiction.