Perhaps the OC has a special ability that is crucial in the fight against the Titans, which makes the characters from the series form a harem around the OC. For example, the OC might be able to communicate with Titans in a certain way, and this strange power intrigues the others. They start to protect and care for the OC more, leading to a harem - like situation.
One idea could be that your OC is a new recruit in the military and gradually gains the attention and affection of various popular characters like Eren, Levi, and Armin. They are all drawn to the OC's unique skills and personality.
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.
A male OC in an Attack on Titan fanfiction could be a double agent. He pretends to be on the side of the Titans while actually working for the Survey Corps. He could have been captured by the Titans as a child and raised among them, but his human instincts and loyalty to his own kind make him turn against the Titans. Another interesting idea is a male OC who is a healer. In a world full of Titan attacks, most of the focus is on combat, but a healer OC could bring a new dimension to the story. He could develop new medical techniques to treat the wounded soldiers, and his struggle to keep people alive in the face of such danger could be a great plot point. And also, a male OC who is a historian, trying to uncover the secrets of the past about the Titans and the origin of the walls.
Another plot could revolve around an OC who is from a different time or dimension and has knowledge of advanced technology. They could use this knowledge to try and create new defenses against the Titans. Maybe they develop a weapon that doesn't require blades and 3D maneuver gear but is more effective in taking down Titans.
One idea could be an OC who has a unique power to communicate with Titans on a deeper level. This power could be a double - edged sword, as it might draw unwanted attention from both humans and Titans. Another plot could revolve around an OC who is a master of stealth and uses it to uncover secrets within the Walls. For example, they could discover hidden chambers or forgotten knowledge about the Titans.
One idea could be that the OC is reincarnated as a titan shifter in a different era of the Attack on Titan world. They could have memories of their past life and use that knowledge to change the course of events. For example, they might try to find a way to end the titan curse earlier.
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.
One idea could be that the OC is a new recruit in the military and Jean takes it upon himself to train her. Their relationship starts off rocky as Jean is a bit brash in his teaching methods, but over time they grow closer. Maybe there's a mission where the OC gets into trouble and Jean has to save her, leading to a deeper emotional connection.
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.
For the OC, first define their backstory. Were they from a family affected by the Titans? This could shape their motivation. Then, for the characters in the harem, stay true to their original personalities from the 'Attack on Titan' series. For example, Levi is strict and disciplined, so if he's part of the harem, his affection for the OC might show in his own way, like being extra protective during missions.
One interesting plot could be that the godlike OC has the power to control the Titans' minds. They could use this power to try and broker peace between the humans and the Titans. For example, they might start by stopping a Titan attack on a walled city and then communicate with both sides to find a common ground.