Maybe the Human Friday has a special power that they're not aware of at first. In the fanfic, as they work for the Avengers, strange things start to happen around them. For example, they can always find things that are lost, which turns out to be a latent telepathic ability to sense the location of objects. This power then becomes crucial in a battle against a villain who has hidden important artifacts all over the city.
One idea could be that the Human Friday character is an ordinary person who accidentally stumbles into the Avengers' base. They then start helping out in small ways, like making coffee just right for each Avenger, which becomes a running joke. Eventually, they prove their worth by using their street - smart knowledge to help the Avengers solve a mystery in the city.
To develop the Human Friday character, start with their backstory. Maybe they grew up in a tough neighborhood and had to learn to be resourceful. This would explain their ability to handle various tasks for the Avengers. For example, if they had to fend for themselves as a kid, they'd be good at finding food and supplies, which translates to helping the Avengers in a similar way.
One idea could be exploring what if Loki had an unexpected ally within the Avengers. Maybe a character who was initially on the heroes' side but got swayed by Loki's charm or promises.
Maybe a fanfic where the counselors team up in a more strategic way. Instead of just scattering, they set traps and work together to try and defeat Jason. They could use the environment in clever ways, like using the old cabins as barricades or luring Jason into a dangerous area.
One plot idea could be that the Inhumans' city of Attilan is in danger and the Avengers are called in to help. The Inhumans are initially hesitant to accept their aid due to their differences, but they soon realize they need to work together. Another idea is a young Inhuman with a powerful but uncontrollable ability is found by the Avengers. They try to help the Inhuman learn to control it while also protecting them from those who would use their power for evil.
One idea could be an imagine where a new superhero joins the Avengers. They have a unique power that the team initially struggles to understand but eventually learns to utilize effectively. For example, a hero with the power to manipulate time on a small scale, like being able to slow down time for a few seconds during a battle.
A more complex plot could involve the Flash's speed force interacting with the Infinity Stones. The Avengers might be trying to figure out how to use or contain the power of the speed force in relation to the Stones. This could lead to all kinds of conflicts and alliances within the story, as different characters have different ideas about how to handle such a powerful and unknown combination of forces.
Maybe a story where the Avengers are transported to Supergirl's universe. They have to adapt to her world's rules and help her fight against a powerful villain there. This could involve a lot of world - building and character development as the Avengers learn about Supergirl's allies and enemies.
A plot could revolve around the Avengers Prime traveling through time to prevent a future disaster that they somehow caused. Along the way, they meet different versions of themselves and have to make tough decisions about changing the timeline.
One idea could be a dragon who is injured and is found by a human. The human nurses the dragon back to health and they form an unbreakable bond. Then they go on adventures together, facing various challenges in a magical world.
One idea could be a human being accidentally transported to the Beastars world and having to navigate the complex social hierarchy between different species. For example, they might initially be feared by some animals due to being a human, but then gradually earn the trust of certain characters through acts of kindness. Another plot could involve a human who has unique knowledge from their own world, like advanced medical techniques, and uses it to help the animals in Beastars. Or perhaps a human gets involved in the school drama at Cherryton Academy, befriending some of the main characters like Legoshi and Haru and getting caught up in their relationships and rivalries.