Finral's backstory about his love for women could be delved into. Maybe he had a past heartbreak that made him so eager to please women. By facing this past trauma in fanfiction, he can grow as a character and become more self - assured.
One idea could be Finral getting a special power upgrade. Maybe he discovers a new spell that allows him to teleport not just himself but also others over long distances without any limitations. This would change his role in the Black Bulls significantly.
Putting Wendy in a leadership role within the guild for a fanfiction story would be interesting. She could learn to be more assertive and make tough decisions, which would help her grow as a character. It would also show how she can inspire others in the guild.
Trixx could be developed by giving it more complex emotions. For example, it could feel guilt when its advice to its holder leads to a bad situation. This would add depth to its character.
Hinata could be developed by showing her taking on more leadership roles. For example, she could lead a small team on a mission and show her strategic thinking and decision - making skills. This would also show her growth from a shy girl to a confident ninja.
Mewtwo's character can be developed further by exploring its emotions more deeply. For example, showing its fear of being alone or its longing for a true family. Fanfiction can also focus on Mewtwo's moral struggles, like whether it should use its powers for revenge or for good.
In fanfiction, Fuli's character can be developed by giving her new relationships. For instance, a love interest could be introduced. This would show a different side of her, perhaps a more vulnerable and caring side.
By giving him new goals. Instead of just winning badges, he could aim to understand the origin of all Pokemon species. This would lead him to explore ancient ruins and talk to Pokemon scholars.
His character can be developed by exploring his past. Maybe he has some unresolved issues from his early days as a ninja. For instance, he could have had a difficult relationship with his former sensei that still haunts him.
Show his growth in terms of leadership. Maybe at first, he's hesitant to take charge, but as the story progresses and he sees the need, he steps up. He could learn from his mistakes and become a more decisive and respected leader within the group of survivors. This would involve him making tough calls and dealing with the consequences.
She could also be developed through her relationships. If she falls in love with a character, how does that change her? Or if she has a falling out with a friend, how does she react? These relationship dynamics can shape her character.