Her character could develop in a way that is very much in contrast to Percy. While Percy is often impulsive, she could be more calculating. This difference causes some friction at first, but as they face challenges together, they learn from each other. For example, she might teach Percy to think before he acts in some situations, and Percy could show her how to be more spontaneous and trust her instincts. Over time, she becomes more well - rounded, balancing her cautious nature with a newfound sense of adventure.
One possibility could be that she shows up at Camp Half - Blood unexpectedly. Maybe she was raised by a mortal family all this time, not knowing about her demigod heritage. When she arrives, she has powers similar to Percy's but also some unique ones, like the ability to communicate with sea creatures in a different way than Percy. This could lead to all sorts of adventures and conflicts within the camp as everyone tries to figure out who she really is and what her role will be.
Percy would likely be more in tune with the concept of home and family. Since Hestia represents the hearth, Percy might be more nurturing and protective. He could develop a stronger sense of responsibility for the well - being of his friends as if they were his family.
You can start by giving her a distinct personality. If Percy is brave and impulsive, make her more cautious and calculating. For example, she could be the one who always thinks twice before jumping into a fight, analyzing the situation and coming up with a plan. This contrast in personalities can create interesting dynamics within the story.
She might start off as a shy character. But as the fanfiction progresses and she discovers her connection to lemons, she becomes more confident. For example, if she uses lemons to make a magical item, she realizes her own capabilities and starts to stand up for herself more.
She would likely be more influenced by Roman values. While Percy is impulsive and often acts on his gut feelings, she might be more disciplined, following the Roman way of strict military - like order. For example, in battle, Percy might charge in headfirst, while she would plan out her moves carefully, taking into account the formations and strategies taught in the Roman camp.
His character would become more confident in his artistic abilities. Apollo is the god of many arts, so Percy would likely be exposed to music, poetry, and painting. He might be more flamboyant in his actions and speech, as Apollo has a certain charm. For example, he could start using more flowery language when talking to his friends or enemies.
Percy's character would likely become more in tune with nature. He'd be more reserved perhaps, as he grows up in an all - female group. His sense of honor might be more shaped by Artemis' values, such as protecting the weak and the natural world.
The character of Percy's twin sister can be developed by giving her unique personality traits. For example, if Percy is brave and impulsive, she could be more cautious and calculating. Her appearance could also be distinct, like having different colored eyes or hair. Additionally, her relationships with other characters in the Percy Jackson universe can help develop her. If she befriends Annabeth, for instance, it can show her intelligence and ability to form strong bonds.
Percy's character would be very different. Growing up alone, he would lack the social skills he has in the original series. He'd be more introverted. His view of the gods would be more cynical as he has no one to tell him the 'glorified' stories. He'd have to learn about his powers through trial and error, which would make him more cautious. He may also develop a stronger survival instinct. His relationships would be different too. He might be more hesitant to open up to others when he finally does meet people. Overall, his character would be a loner with a unique perspective on the demigod world.
His character could develop in a way that he becomes more powerful. Since Kronos is a very powerful being, Percy might inherit some latent power. But he would have to learn to control it. He would also become more empathetic towards the Titans in a sense, as he realizes that Kronos is his brother. This could lead to him trying to find a middle ground between the Titans and the gods, which would be a major shift in his character from just being a defender of the gods.