The theme might be 'Love Transcending Boundaries'. In the Pokemon world, Ash has seen all kinds of relationships, but his relationship with Delia evolving into a romantic one in the fanfiction defies the typical mother - son bond. Their wedding would symbolize that love can cross any boundaries, whether they are social norms or pre - conceived ideas of relationships.
One possible fanfiction could start with Ash finally returning to Pallet Town as a champion. His mother, Delia, is overjoyed. As time passes, Ash realizes his deep love and gratitude for his mother is something more. He decides to propose in a simple yet heartfelt way, in their little kitchen where she has cooked so many meals for him. The wedding would be a small affair, with all of Ash's friends from his travels coming to Pallet Town. Pikachu would be the ring - bearer, of course. Everyone would celebrate this unique union of a mother - son like bond evolving into a romantic relationship.
One common theme is family love. Delia is Ash's mother, so fanfictions often explore the deep love and support she gives to Ash. Another theme is Ash's growth, and how Delia has influenced that growth over the years.
One good fanfic could be 'Ash's Homecoming'. It focuses on Ash returning home to Pallet Town and his heartwarming interactions with Delia. It shows their strong bond through simple daily activities like having dinner together and sharing stories of his adventures.
One great Ash Ketchum and Delia fanfiction is 'A Mother's Love'. It beautifully portrays Delia's unwavering support for Ash's Pokémon journey. Another interesting one is 'Homecoming', which focuses on Ash's return home and his interactions with Delia after a long adventure.
First, think about their relationship. Ash is a determined Pokemon trainer and Delia is his loving mother. You could start with a simple idea like Ash coming home for a surprise visit. Then, create a plot around that. Maybe there's a local Pokemon problem in Pallet Town that Ash helps with, with Delia's moral support.
It could be a famous Pokémon trainer. Maybe someone who has traveled to many different regions and has a lot of knowledge about rare Pokémon.
His rival, Gary, could be a likely candidate. Gary has always been competitive with Ash, and in this fanfiction, his jealousy could reach a boiling point, causing him to betray Ash for his own gain, like trying to steal his Pokémon or get credit for his achievements.
A possible plot could be Ash visiting an old, abandoned Pokémon sanctuary. He explores the place quietly, feeling a sense of melancholy. As he walks through the overgrown paths, he discovers an injured and rare Pokémon. He then uses his knowledge and skills in a very calm and methodical way to nurse it back to health. This shows a different side of Ash, one that is more patient and less about the big battles.
The death of a Pokémon he's close to. Pokémon are like family to Ash, and if he were to lose one, especially in a tragic way, it would be a huge emotional blow and would likely make him cry. For example, if Pikachu were to sacrifice itself to save Ash from a powerful enemy.
In this fanfiction, Ash's father might be a trainer who lost his memory. He has been traveling around the Pokémon world without realizing he has a son. One day, Ash might cross paths with him during his own journey, and through a series of events, his father's memory could be restored.