She could be developed as a very intelligent character. If she was raised in a magical family other than the Potters, she might have been taught a lot about magic theory. This intelligence could be used to solve some of the complex magical problems that Harry and his friends face. Also, she could be a bit of a rebel, not wanting to be defined by her relation to Harry and forging her own path in the wizarding world while still being a valuable part of the fight against evil.
The sister's character could be developed as a strong - willed individual. For example, if she was raised in a difficult situation, like in an orphanage in the Muggle world, she could have a tough exterior but a kind heart. She might be initially distrustful of the wizarding world when she discovers it, but as she learns more about her family and the fight against Voldemort, she becomes more open - minded and determined to help.
Her magical abilities can play a big role in her development. If she has a special gift, like being able to communicate with magical creatures in a way no one else can, it can shape her character. She could be seen as an outcast by some in the wizarding world because of this strange ability, but she uses it to her advantage. For instance, she might get help from a powerful magical creature to save Harry from a dangerous situation.
She could be developed by focusing on her relationship with Harry. Maybe Harry has to learn sign language to communicate with her better, and this strengthens their bond. Their shared experiences of being different from other wizards (Harry as 'the boy who lived' and she as a deaf wizard) could be explored.
To develop her character, start with her appearance. She could have the same green eyes as Harry but with long, flowing red hair like their mother. Then, think about her personality. She might be more headstrong and confident than Harry, having grown up a bit earlier. For instance, she could be the type to stand up to bullies without hesitation, even when they are older and more powerful wizards.
One way to develop her is through her internal world. Because she can't see, she might have a very vivid imagination. You could describe how she pictures the wizarding world in her mind. She could be an artist, creating magical art through touch and sound. Her relationship with Harry could also be a big part of her development. Harry might be overprotective at first, but she shows him that she is capable. And she could have a special connection to the magic of nature, feeling the energy of plants and animals in a way that sighted wizards can't.
You can start by giving her a distinct personality. If Harry is brave and impulsive, she could be more cautious and thoughtful. This would create an interesting contrast between them. Also, give her some unique hobbies or interests, like she's really into ancient runes or potion - making. This will make her a more well - rounded character.
She could be more introverted compared to Harry. While Harry is often thrust into the spotlight, the little sister could be someone who prefers to stay in the background, observing and learning. This would make her a bit of an enigma to the other characters at Hogwarts, and her actions might be more calculated and less impulsive.
Suppose there's a Tri - Wizard Tournament - like event at Hogwarts. Harry's sister and Draco are both chosen as representatives for their houses. They are forced to train together. At first, they are constantly bickering, but as they face the challenges together, they learn to trust and rely on each other. This shared experience could be the foundation for a deeper relationship.
She could develop her identity through her relationships. For example, making friends at Hogwarts who see her as an individual, not just as Harry Potter's sister. She might join a club or a study group where she can shine on her own merits.
In some fanfictions, it could be an original character created by the author. Maybe a witch who was the result of an affair that his father had before he married his mother. However, this is completely against the canon of the original books, but in the world of fanfiction, anything is possible.
Chloe's character can be developed by giving her a flaw. Let's say she is overly curious and sometimes gets into trouble because of it. One time she might open a forbidden book in the library without realizing the danger, and this leads to a series of events that teach her to be more cautious while still maintaining her curious nature. As she faces the consequences of her actions, she becomes more mature and well - rounded.