One way to develop Toshiro's character in fanfiction is to give him a moral dilemma that challenges his beliefs. For instance, he might have to choose between following the strict rules of the Soul Society or saving Momo in a situation where the rules might not allow it. This would force him to reevaluate his loyalty and values. As for Momo, her character could be developed by delving into her past traumas. Maybe she has some unresolved issues from her childhood in the Soul Society that are affecting her current relationships. By facing these traumas, she can become a more complex and well - rounded character, which in turn would impact her relationship with Toshiro.
For Ichigo, his character could be developed by exploring his inner turmoil more deeply. Maybe he struggles with the idea of being half - human, half - Shinigami in a different way. As for Rukia, she could be developed by showing more of her past, like her early days in the Soul Society before she met Ichigo. This would give more depth to her character.
One popular plotline could be Toshiro and Momo growing up together in the Soul Society. They face various challenges during their training and form a deep bond that endures through difficulties. Another might be a story where Momo is in danger and Toshiro has to use all his strength and skills to save her, which showcases his loyalty and feelings for her. There could also be a plot where they go on a mission together outside the Soul Society and discover new things about each other and their own powers.
For Izuku, his self - sacrificing nature can be further developed by putting him in situations where he has to choose between his own safety and the safety of others. This will show his growth as a hero. For Momo, her confidence can be explored more. Maybe she has to lead a team in a difficult task and overcome her insecurities. Inko's caring side can be developed by having her take in more characters who are in need, like an orphaned hero - in - training. This will show her as a mother figure not just to Izuku but to the whole community.
Have them face a difficult decision together that affects the whole family. Their different viewpoints could lead to some arguments at first, but through communication and understanding, their relationship would grow stronger. For instance, if they had to decide whether to send a family member away for training or keep them at home for safety.
For Krillin, he could be developed by showing his growth in confidence. Maybe he takes on bigger threats without hesitation. For Android 18, her softer side could be explored more, like her maternal instincts if they have a child.
For Alaric, his character could be developed further by exploring his past traumas more deeply. Maybe he has some unresolved issues from his time as a vampire hunter that resurface when he's around Caroline. For Caroline, her character could grow by having her face more complex moral dilemmas. For example, if she has to choose between helping Alaric or following the rules of the vampire community. They could also develop their relationship by having them share more personal stories and secrets with each other.
For Boruto, he could be developed by facing more complex moral dilemmas. For example, having to choose between the safety of the village and the life of a friend who has been misled. Mitsuki, on the other hand, could be developed by exploring his origin more deeply. Maybe he discovers more about his 'parent' Orochimaru and how that affects his identity as a ninja.
Bart's character could be developed by making him more responsible. In the fanfic, Greta could be the catalyst for this change. She could give him tasks to do that are important, like helping her with a community project. As he does these things, he realizes he can be more than just a troublemaker. Greta, on the other hand, could be developed by showing her flaws. Maybe she's overly perfectionist and Bart helps her see that it's okay to make mistakes.
For Ardyn, dig deeper into his emotions. Show his vulnerability when it comes to Aera. Perhaps write about his dreams and nightmares related to her. In terms of Aera, develop her character by showing her influence on the people around her. You can also give her a more active role in the events that unfold, rather than just being a passive love interest. Let her be the one who tries to change Ardyn's fate actively.
Character development could occur through their interactions with other characters. If they meet new androids or humans, how they react can show different sides of their personalities. For instance, if they encounter a human who is prejudiced against androids, RK800 might try to reason with the person, while RK900 could be more defensive. This would show RK800's more diplomatic side and RK900's protective nature.