You can start by giving them unique personalities. For example, one could be really shy but have a hidden strength. Then, put them in different situations to show how they grow. Like when they face a monster, the shy one might find the courage to fight.
Think about their backstories. If they are adopted, what was their life before? Maybe one was an orphan on the streets and had to be really tough to survive. This would influence how they interact with others in the fanfiction. Also, give them relationships with the existing characters. They could have a mentor - mentee relationship with Percy or Annabeth.
To develop the characters, explore their fears and desires. Let's say one of the adopted children desires to be accepted by the other demigods. Their fear could be of being rejected because they are different. As the story progresses, they could overcome this fear through their actions and the support of their new family. You can also show their development through their dialogue. If at first they are hesitant to speak up, later they become more confident and start leading conversations.
One idea could be that the adopted children have special powers related to different elements, like one can control water in a unique way different from Percy. They could go on a quest to find a lost artifact that is key to their new family's safety.
For Percy, you could explore his insecurities more deeply. Maybe he's worried about living up to his reputation as a hero. With Emma, give her unique traits. For example, she could be really good at deciphering ancient languages. Then, put them in situations where they have to rely on each other. Like when they're trapped in an ancient maze.
Another character that could be included is Clarisse. Her tough - as - nails attitude could contrast with the niece's, and they could start off as rivals but eventually become friends. Also, Tyson, Percy's cyclops half - brother. He could be like a big, protective figure for the niece, and his unique abilities could come in handy during adventures or when the niece is in danger.
In fanfiction, Percy and Hermione's characters can be developed in various ways. Some writers might explore Percy's sense of duty and how it interacts with Hermione's thirst for knowledge. For example, they could be on a mission together where Percy's strategic planning, which he learned from his time in the Ministry, combines with Hermione's research skills to solve a complex magical problem.
To develop Percy, you can focus on his loyalty. In a fanfiction with Hermione, this loyalty could be tested in new ways. For instance, when they are in a situation where they have to choose between their own worlds' interests. Hermione can be developed by highlighting her adaptability. She has to adapt to the new world of demigods, with its own rules and hierarchies. You can also show how their individual character traits affect their relationship. Percy's impulsiveness might sometimes clash with Hermione's careful planning, but they can also find a balance and grow together as characters.
For Dark Percy, his character could be developed by showing the internal struggle between his dark side and his original self. Flashbacks to his normal self can be used to highlight the contrast. As for Zoe, her development can be centered around her growing trust in Dark Percy despite his changed state. She could start as a cautious observer and gradually become a fierce defender of him.
To develop the characters, consider how they interact with the lemon aspect. Percy could start off being a bit skeptical about all the lemon stuff his father is into. But as he spends more time with Poseidon in these lemon - related adventures, he could learn to appreciate it and grow as a person. Poseidon, on the other hand, could be developed by showing his pride in Percy when Percy uses the lemon - inspired powers or items he gives him. This could make Poseidon more relatable as a father figure.
For Percy, you could develop his character by showing how he adapts to the more reserved and strict world of Artemis. He might start to understand the importance of her values, like purity and the protection of the wild. This could make him more cautious in his actions and more in tune with nature.
For Percy, you could explore his growth in a world outside of his normal demigod realm. Meeting Rosalie could make him more aware of different forms of immortality and power. Maybe he starts to question his own mortality in a different way. For Rosalie, her encounter with Percy could soften her edges a bit. Since Percy is more in touch with his emotions, she could learn from him and become more empathetic towards others, not just her vampire family.
For Artemis, you could show her softer side. In the original stories, she's very stoic. But in the crossover, maybe Percy's more human and relatable nature starts to chip away at her cold exterior. For Percy, he could grow in his understanding of the more wild and untamed aspects of the divine world through his interactions with Artemis.