Perhaps the story explores the power dynamics within the ape community when a human is adopted. The human might have to deal with different ape factions, some being more accepting while others are hostile.
One idea could be a prequel showing how some of the apes developed their unique skills before the events of the movie. For example, how Caesar learned to be such an effective leader. Another could be a story where a small group of apes gets separated from the main colony and has to face different challenges, like finding a new place to live with limited resources. And a third idea might be a fanfiction that focuses on the human side more, showing how some humans are secretly trying to make peace with the apes despite the overall conflict.
One idea could be that the magic from the Harry Potter world somehow gets introduced to the Planet of the Apes. The apes might initially be frightened by the strange new powers but then some of the more intelligent ones start to study it. Another could be that a Hogwarts student gets magically transported to the Planet of the Apes and has to use their magic to survive and find a way back home. They could also try to teach the apes some basic magic concepts in exchange for help.
One idea could be that the adopted character has a special power that the Avengers initially don't understand. This power could be something like the ability to communicate with animals, which helps them during a mission where they need to track a villain through a forest. Another could be that the character has a connection to an ancient artifact that the Avengers are also interested in for some reason, and this connection leads to a series of adventures.
One idea could be that the main character, after being adopted by aliens, discovers they have a special power that is crucial for the survival of the alien race. Another could be that the character has to adapt to the strange alien customs and family structure while also trying to find a way back to Earth. Maybe they also form an unexpected friendship with an alien outcast.
One idea could be that the main character discovers they have magical powers that are different from the witch's. For example, they can control time in a unique way while the witch mainly deals with nature magic. Another plot could involve the main character being adopted into a witch family and having to learn their ways to fit in, like attending a magical school for witches and warlocks where they face challenges from other students who are skeptical of an outsider joining. Also, perhaps the main character is adopted by the witch to fulfill a prophecy, and they have to figure out what that prophecy means and how to fulfill it while dealing with the normal struggles of growing up in a magical world.
Well, in such a fanfiction, it might be fascinating to see how the relationships with his original friends, like Ron and Hermione, are affected. Since his family situation has changed, perhaps their interactions become more complex. For example, they might have to deal with a new 'Harry' who has different priorities due to his new family.
Well, perhaps the story could revolve around the character being adopted during a difficult time in their life. David Dobrik becomes like a mentor and a father figure. The character then has to adjust to living in a new environment filled with cameras and the chaos of the vlog squad. They could also face some jealousy from others who might feel the new adoptee is getting too much attention.
One idea could be a story where the adopted character discovers a hidden musical talent inspired by Lennon's music. They start writing songs in the same style and end up making a name for themselves in the music world.
One idea could be a story where a young orphan has a special bond with one of the pitbulls at the shelter. The pitbull helps the orphan overcome their fears and insecurities.
Maybe the fanfiction could be about Tony adopting a child with special powers. He has to protect the child from those who would misuse the powers while also helping the child understand and control them. This could involve lots of action scenes and emotional bonding between Tony and the adopted child.