For Link, you can focus on his reaction to the female Chu Jelly. Maybe he starts off being cautious but as he sees her good nature, he becomes more open. For the female Chu Jelly, develop her character by showing her discovery of the human world through Link. For example, she could be curious about Link's sword and he could teach her about its significance.
To develop Link, you could explore his past experiences and how they influence his relationship with the female Chu Jelly. If he had a bad experience with a similar magical being, he would be more hesitant at first. For the female Chu Jelly, her character can be developed by her interactions with other non - main characters. If she is kind to a group of children in a village, it shows her benevolent nature and how she is growing as a character in this new world.
One idea could be that Link discovers a mysterious Chu Jelly that has the form of a female. She has the power to heal his wounds and they embark on a journey together to find the source of a dark magic that is corrupting the land. Along the way, they face various challenges and their bond grows stronger.
Link's character can be developed by showing his growth in courage. For example, in the fanfic, he could start out hesitant to face a certain powerful enemy along the Spirit Tracks but gradually overcome his fear. Zelda's character can be developed through her wisdom. She could start to use her knowledge of the ancient lore related to the Spirit Tracks to solve problems. Also, their relationship can be developed by having them learn to trust each other more deeply.
Their relationship could develop through mutual respect. Link respects the Great Fairy Lemon's power and wisdom, and she respects his courage and determination. For example, every time Link visits her for a power - up, they have a brief conversation that gradually deepens over time. They start to share stories about their experiences in Hyrule, which brings them closer.
To develop the harem characters effectively, give each of them a unique backstory related to Link. For example, one could have a past encounter with Link that changed her life. Another way is to give them distinct personalities. One could be shy and reserved, while another is bold and outspoken. This creates contrast and makes them more interesting.
A female character could be developed as a Dalek sympathizer. This would be an interesting twist. She might believe that the Daleks are not entirely evil and that there is a way to rehabilitate them. She could work towards that goal in the fanfiction, facing opposition from other characters who see the Daleks as pure evil.
In non - adult - themed fanfiction, male characters can be developed by exploring their backstories, like their family upbringing or past traumas. Female characters can be developed through their relationships, such as friendships or rivalries. Aliens can be developed by focusing on their unique abilities and how they adapt to new environments.
In female - dominated society fanfiction, characters can be developed by showing their reactions to the power dynamics. For example, a male character might be shy and reserved as he's used to being in a secondary position, while a female character could be confident and assertive. Another way is to explore their relationships. A female character could have a sister - like bond with other women, which shows her loyalty and connection to the female - dominated society.
For Shenzi, you could explore her backstory more. Maybe she had a difficult upbringing in the hyena clan that made her so tough and competitive. Show her softer side, like her love for a particular part of their territory, or her bond with a younger hyena. For the female hyena, give her unique traits. She could be more agile but less experienced in group dynamics. Develop her character by having her learn from her encounters with Shenzi, growing more confident and strategic as the story progresses.
To develop Naruto in this fanfiction, you could focus on his ability to adapt to the new situation with the female Akamaru - like character. He could learn new skills or ways of thinking from her. For the female character, show her evolution from a somewhat wild and instinct - driven being to someone who can make rational decisions. You can also develop her by exploring her relationships with other characters in the Naruto universe aside from Naruto. Maybe she has an interesting dynamic with Shikamaru or Sakura. Show how she changes and grows through these interactions.
To develop Female Kaa's character, we can explore her past. Perhaps she had a difficult upbringing as a snake in the jungle and that's why she's so protective of Mowgli. Mowgli, on the other hand, can be developed by having him teach Female Kaa about human emotions and concepts. This exchange of knowledge would make their relationship more complex and interesting. For example, Mowgli could introduce the idea of friendship in a more human way to Female Kaa, and she could in turn teach him how to better blend in with the jungle at night.