To develop Delia's character, we could show her interacting with Giovanni's world. She could start to understand the motives behind Team Rocket's actions, which changes her view of Giovanni. For Giovanni, we can develop his character by having him experience kindness from Delia. This could make him want to change his ways. Maybe he starts to think about using Team Rocket for good instead of evil. He could also be developed by showing his past traumas that led him to be the villain he is, and how Delia might be able to heal those wounds.
Writers often characterize Giovanni as a complex character. He is still the powerful and somewhat menacing leader of Team Rocket. But in fanfictions with Delia, he may show a softer side. For example, he might be more hesitant to carry out his evil plans when Delia is around. He could also be shown as a bit more vulnerable, especially if he has feelings for Delia and is afraid of rejection or of losing her.
A common plotline is a love - triangle type situation. Giovanni has feelings for Delia, but Delia is in love with Ash's father (in some fanfictions). This creates a lot of drama and tension. Also, there could be a plot where Delia tries to reform Giovanni. She believes there is good in him and tries to convince him to use his power and resources for good in the Pokémon world instead of for the evil deeds of Team Rocket.
One interesting plot idea could be that Delia, Ash's mother, has some long - lost connection to Giovanni. Maybe they were childhood friends before Giovanni took the path of the villain. Another could be a story where Giovanni, for some reason, has to protect Delia from other evil forces in the Pokemon world, which turns into an unexpected alliance. And a third idea might be that Delia discovers a secret about Giovanni's past that makes her question her own understanding of good and evil in the Pokemon universe.
The relationship can be developed through shared goals. For example, if they both aim to capture a super - rare Pokemon, they could work closely together. Giovanni could provide Jessie with better resources and training, which would make Jessie more loyal to him. Another way is through a backstory. Maybe they both had a difficult childhood related to Pokemon, which could create a bond between them.
In the fanfic, Jessie could be developed as more independent. In the original series, she often follows orders from Team Rocket. But in the fanfic, she might start making her own decisions regarding her Pokemon training and battles, especially when it comes to impressing Giovanni.
By exploring their past as Pokemon. If a Bulbasaur - turned - human had a tough life in the wild as a Pokemon, that could shape their human personality. Maybe they'd be more cautious or have a strong survival instinct.
In these fanfictions, Silver often develops by facing his internal conflict regarding Giovanni. His experiences with his father - figure make him more resolute in his own beliefs. Giovanni, on the other hand, may show different sides of himself, like a hint of paternal love for Silver that was hidden before. This makes his character more complex.
For Ash, his character can be developed by showing him learning from Zinnia's more in - depth knowledge of Pokemon lore. He could become more patient and strategic in his battles. For Zinnia, she could develop by opening up more to Ash and others. Maybe she starts to see the value in Ash's more straightforward and passionate approach to Pokemon training.
To develop characters interestingly in a Pokemon harem fanfiction, you can explore their fears. Maybe a certain Pokemon in the harem is terrified of water because of a past incident. The main character then has to help it overcome this fear. This process of facing and conquering fears can make the character grow. Another aspect is their cultural or species - specific traits. A Pokemon from a certain region might have unique customs or abilities. Incorporating these into their character development, like how they interact with the main character based on these traits, can make them really stand out.
They could also develop their characters through conflict. For instance, they might have different ideas on how to handle a difficult situation involving a wild and aggressive Pokemon. This disagreement could lead to them learning from each other and growing as individuals, while also strengthening their friendship.