The key is to make their modern origin matter. They could have a modern hobby like photography, and in the Attack on Titan world, they might be fascinated by the landscapes and want to document them in some way. Their modern education could also play a role. If they studied history, they could compare the events in Attack on Titan to real - world historical events. This can give them unique insights. Their character arc could involve learning to balance their modern values with the necessities of survival in the Titan - filled world. They might start out trying to change everything but then realize they need to adapt to some of the existing ways too.
One major challenge would be the cultural shock. The modern day OC is used to a very different social structure and way of life. In Attack on Titan, the military - dominated society with its strict rules and hierarchies would be a big adjustment. Another challenge is the lack of modern technology. They would have to get used to doing things without the conveniences they're used to, like electricity and advanced communication devices. And of course, the constant threat of Titans is something they'd have to face, which is a far cry from the relatively safe modern world they come from.
First, give your OC a unique backstory. Maybe they come from a long - lost clan within the walls. Then, focus on their Titan form. What makes it special? Is it faster, stronger, or has some unique ability? Also, think about their relationships with other characters from the series. Do they have a vendetta against a certain Titan shifter? This all helps in creating a really engaging OC for your fanfiction.
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.
Another aspect could be cultural or family - related. If the male OC has a unique family background or cultural heritage within the Attack on Titan world, it could intrigue Mikasa. He could share stories about his family's traditions, and Mikasa, who has lost most of her family, might be drawn to the sense of family that the male OC represents. This could be the starting point of a relationship where they find comfort in each other's presence.
Sakura Haruno would likely develop her combat skills further. In the Attack on Titan world, she'd face different types of enemies compared to Naruto. So, she'd adapt her fighting style. For example, she might learn to use the 3D Maneuver Gear more effectively, combining it with her quick punches and kicks. Her medical skills would also be crucial for her development. She'd be constantly saving lives, which would give her a sense of purpose and boost her confidence.
Give your OC a distinct personality trait. For example, if they're overly confident in the face of Titans, it'll make them stand out. Also, a unique physical feature like a strange birthmark or a different - colored eye can help. Their backstory is crucial too. Maybe they grew up in an orphanage within the Walls and that has shaped their view of the world and their determination to fight Titans.
Sakura's character could develop in several ways. First, she might become more hardened due to the constant threat of Titans. In the Naruto world, she had to face strong opponents, but the Titans are a whole different level of danger. This could make her more cautious and strategic in her actions.
Well, start by thinking about the personality of your male OC shifter. Is he brave, cunning, or maybe a bit of both? Then, for the shifter aspect, you could base it on something symbolic, like he shifts into a titan that represents his inner fears or desires. When it comes to the story, it's important to set it in the Attack on Titan world realistically. Use the existing settings, like the walls and the different military branches. Also, don't be afraid to introduce new conflicts that are specific to your OC, such as a rival shifter who wants to steal his power.
Think about their relationships. Maybe they have a connection to a well - known character from their past life. For instance, they could be the reincarnation of someone who was related to a Survey Corps member. This connection can create interesting storylines and interactions. Also, their personality traits can be a mix of modern - day values and the harsh reality of the Attack on Titan world, like being very empathetic but also having to be tough to survive.
Give your OC a distinct physical trait, like a unique hair color or a scar. Also, a memorable backstory is crucial. For example, if your OC survived a Titan attack that wiped out their family, it would shape their motives. Their personality should be complex too, not just all good or all bad.