One idea could be exploring Eren's family life as a baby. Maybe showing how his parents interacted with him in a more detailed way, like his mother singing lullabies. Another could be a story where baby Eren has some sort of premonition about the future in his dreams, which is a very unique take on his character.
A really interesting plot could be that baby Eren has a special connection with the Titans even at that young age. Maybe in the fanfiction, he can sense the Titans in a way that no one else can. This could lead to all sorts of events, like his family trying to figure out what's wrong with him or the local elders being suspicious of him because of this strange ability.
One interesting idea could be exploring Eren's potential even as a baby in the context of the Attack on Titan world. Maybe showing how his early experiences, even as a baby, might shape his future determination against the Titans.
One idea could be exploring Dark Eren's internal struggle in more depth. Maybe he has to make really tough choices between his friends and his new, darker goals. Another could be a scenario where Dark Eren tries to recruit others to his side, and how they react to his changed personality.
A theme that often comes up is destiny. Fans like to write about how even as a baby, Eren is already on a path towards his future as a Titan - shifter and a hero. It's about how his early days might be subtly guiding him towards that fate. For example, he might show signs of great strength or determination even as a tiny baby. And also, protection is a theme. His family and those around him are trying to protect him from the harsh reality of the world outside the walls, which is a big part of many baby Eren fanfictions.
One popular fanfiction idea could be a story where Eren has to team up with the Female Titan against a new, more powerful enemy in the world of Attack on Titan. Maybe they start off as reluctant allies, but as they face challenges together, they begin to understand each other better and develop a unique bond.
Perhaps the friendly titan is a protector of a certain area outside the walls that the humans have not explored much. The story could be about the Survey Corps making an alliance with this titan. The titan guards the area from other dangerous titans, and in return, the humans help the titan when it gets injured. This could lead to a whole new understanding of the titan world and how they can co - exist with the friendly ones.
Well, one interesting concept could be exploring the origin of the Baby Titan. Maybe it has a unique backstory that ties into the overall lore of Attack on Titan. For example, it could be related to some secret experiment by the Marleyans or an unforeseen consequence of the Titans' existence.
One idea could be exploring an alternate timeline where the main characters have different Titan powers. For example, Eren could have the Colossal Titan's power from the start. Another could be a story centered around a new character who joins the Survey Corps and has a unique ability to communicate with Titans on a deeper level. Maybe they try to find a peaceful coexistence with the Titans instead of just fighting them all the time.
One idea could be exploring an alternate timeline where Eren never became a Titan. Maybe the Scouts find a different way to fight the Titans, relying more on advanced technology and strategic warfare. Another could be a fanfiction centered around a new character who has a unique ability to communicate with Titans in a non - aggressive way, changing the whole dynamic of the battle.
One idea could be an OC who has a unique ability to communicate with the Titans. This could lead to a whole new way of dealing with the Titan threat, like trying to negotiate or understand their motives. Another plot could revolve around an OC from a different nation outside the Walls who has their own knowledge and skills regarding Titans. They could bring in new strategies and technologies.
Another plot idea could be that the human princess embarks on a journey outside the walls not just to fight titans but also to find the origin of the titans. Along the way, she meets different groups of people who have their own theories and knowledge about the titans. This journey could be filled with self - discovery as she realizes that the world outside the walls is much more complex than she thought, and she has to use her wits and leadership skills to survive and bring back important information to her people.