There are short stories that focus on the daily lives of the cadets before the big Titan attacks. These stories show their training, friendships, and rivalries. For example, some stories explore the relationship between Eren and Jean during their cadet days, which is really fascinating as it shows the development of their complex relationship from the start.
The short stories about the history of the Walls are also great reads. They explain how the Walls were built, the secrets behind them, and the possible reasons for their existence. It's really cool to see the world - building aspect of Attack on Titan explored in these short stories, as it adds more depth to the overall story and makes you understand the setting and the situation of the characters much better.
The short story about Levi's past is really interesting. It gives more depth to his character.
There could be a story that delves into the early days of Eren's training. It might detail his struggles, how he interacted with his comrades like Armin and Mikasa during that time, and how he slowly started to develop his skills and his unwavering will to fight the Titans. For example, he might have had difficulties with the ODM gear at first, but through perseverance, he overcame them.
You can try looking for them on official manga reading platforms such as Crunchyroll Manga or Kodansha's official website. They often have a collection of Attack on Titan related content, including short stories.
One interesting plot point could be the exploration of a character's backstory that was not fully covered in the main series. For example, perhaps we learn more about a minor character's motivation for joining the Survey Corps.
There are fanfics that focus on alternate timelines. Like, what if Eren didn't inherit the Attack Titan? This type of fanfic would show how different characters might interact and how the story would unfold without Eren having that power. It could lead to new alliances and different ways of fighting the Titans.
One interesting 'Attack on Titan' fanfic could be one that explores an alternate universe where the characters have different abilities. For example, Eren might have the power to control not just Titans but also the elements. Another could be a fanfic that focuses on the backstories of the secondary characters, like Sasha's life before joining the Survey Corps. There are also fanfics that re - imagine the relationships between the characters, such as a romantic relationship between Levi and Hange that wasn't really explored in the original series.
One interesting story could be about a character facing the challenges of pregnancy during the chaos of the titan attacks. Maybe a female soldier discovers she's pregnant and has to balance her duty to protect and her newfound motherhood.
One interesting 'Baby Attack on Titan Fanfic' could be about a baby who has some sort of special connection to the Titans. Maybe the baby is found in a Titan - infested area and has an uncanny ability to calm the Titans down. This would be a really unique take on the Attack on Titan universe as it adds a completely different element to the otherwise very dark and violent world of the series.
In some 'Harry in Attack on Titan fanfiction', Harry might bring his knowledge of potions to the world of Attack on Titan. He could create potions that give the soldiers enhanced strength or speed, similar to the Titan serum but without the negative side effects. This would completely change the dynamics of the fight against the Titans and make for a really exciting story.
One interesting 'Attack on Titan Reaction Fanfic' could be about the characters' reactions to the discovery of new Titans. For example, Eren might be shocked and determined to fight even harder. Another could focus on the Scouts' reaction to a new threat within the walls, like a hidden group working against them. And there could be fanfics where the civilians' reactions to the ongoing battles are explored, showing their fear and hope for survival.