She could be a key figure in a plan to bridge the gap between the Eldians and the Marleyans. Since she is Zeke's sister, she might have some influence over him. Maybe she tries to convince Zeke to change his ways and work towards a more peaceful co - existence. Along the way, she faces many challenges, including facing off against Titans and dealing with the political intrigue within both the Eldian and Marleyan societies.
In these fanfics, the theme of power and its consequences is quite prevalent. If the oc sister has some special abilities or a unique position in the 'Attack on Titan' world, how she uses that power and what it costs her can be a major theme. Additionally, themes of betrayal and redemption can also be found. Maybe she betrays Zeke or someone else for a greater good and then has to seek redemption. Or vice versa, she is betrayed by someone close and has to deal with the aftermath. These themes add depth and complexity to the stories.
Another theme is identity. The sister might struggle with her identity as a twin, as a member of the world in 'Attack on Titan', and perhaps with some special abilities she has. She could be trying to find her place in a world full of chaos and danger. For example, she might question whether she should side with Zeke's ideas or go her own way.
Well, finding a specific 'Attack on Titan Zeke sister oc fanfic' can be a bit of a hunt. You could also try fanfiction.net. Sometimes, joining Attack on Titan fan groups on social media platforms like Reddit or Facebook can be helpful. People in those groups often share and recommend interesting fanfics, including ones related to Zeke's sister original characters.
The plot could involve a conflict within the group of titan shifters because of the tenth titan. Some might see it as a threat, while others believe it's the solution to end the war. The tenth titan's power could be something that disrupts the balance between the different factions. For example, it could have the ability to nullify the powers of other titans, which would make it a highly sought - after and dangerous power.
Her character could be developed by showing her reactions to the world around her. For example, if she witnesses the destruction caused by Titans, it could make her determined to find a solution. She might start off as a naive girl but as she experiences more, she becomes more street - smart. Her relationship with Zeke could also be a major factor. If Zeke has done some controversial things, she could struggle with her loyalty to him while also trying to do what's right.
One idea could be an OC who is a Titan Shifter with a unique ability like being able to control the elements while in Titan form. For example, they could create ice storms or fire blasts. Another could be an OC who has to struggle with the morality of being a Titan Shifter in a world where Titans are seen as pure evil. They might try to find a way to coexist with the other humans instead of just fighting Titans.
A great idea for an 'Attack on Titan' permanent titan fanfic would be to focus on the relationship between a permanent titan and a human. It could be a story of an unlikely friendship or a situation where the human is trying to study the titan to gain some sort of advantage in the fight against the other titans. The fanfic could also delve into the emotional and psychological aspects of the titan, if it has any remnants of its former human self, and how it copes with its existence.
One interesting plot idea could be about a group of modern - day people suddenly finding themselves in a world similar to that of Attack on Titan. They have to quickly learn the skills of survival, like using the 3D maneuver gear which they discover in an abandoned military base. Another could be a fanfic where the Titans exist in a parallel modern world, and a secret organization has been fighting them in the shadows all along.
One idea could be exploring an alternate world where the Titans have different abilities. For example, some Titans might be able to fly or control the elements. Another plot could revolve around the characters from the original 'Attack on Titan' being transported to a completely different world with its own set of rules and threats. Maybe in this new world, the Survey Corps has to form alliances with strange new creatures to fight against a common enemy.
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.