Well, perhaps in the fanfiction, Ash is raised by Giovanni in a world where the Pokemon League is more corrupt. Ash might be trained to take over the League for Giovanni's benefit. He could then meet his old friends and have to choose between his loyalty to Giovanni and his true friendships. It would make for a very complex and interesting story.
In this fanfiction, a possible plot could be that Giovanni raises Ash to be his ultimate weapon against the other powerful trainers. Ash is taught unique and sometimes unethical training methods. As he grows, he starts to question Giovanni's motives. He might also develop a different bond with his Pokemon compared to how he would have in the original series. For example, his Pikachu could be more of a tool for power at first but then develop into a true friend as Ash starts to rebel against Giovanni's teachings.
One interesting plotline could be Ash finally facing off against Giovanni in a high - stakes Pokémon battle where the fate of a region is at stake. Maybe Ash has to use all his skills and the bond with his Pokémon to overcome Giovanni's powerful and devious team.
One possible plotline could be Ash gaining unique powers from Arceus. For example, he might be able to communicate with all Pokémon in a more profound way. Another could be that Ash has a special mission given by Arceus to save the Pokémon world from a great threat. And perhaps he has to face challenges that test his new - found relationship with Arceus and the powers it has bestowed upon him.
Definitely his adoptive father, Giovanni. Also, the members of Team Rocket like Jessie and James would probably have a different relationship with Ash. They might see him as a sort of prodigy or future leader. And his original friends like Misty and Brock might cross paths with him, which would lead to some very tense and interesting interactions.
One possible plotline could be that Ash is raised by Arceus to be a sort of Pokémon messiah. He is taught the true essence of Pokémon and is sent on a quest to save the Pokémon world from an impending doom.
One popular Ash Giovanni fanfiction might be those that explore their relationship in an alternate Pokemon universe. Maybe a story where they team up to face a new and powerful threat in the Pokemon world.
One interesting plotline could be the relationship between the oak and the ash characters. Maybe they start as rivals and gradually develop an understanding and friendship. For example, they might compete for resources in their magical forest setting at first, but then realize they can achieve more by working together.
One interesting plotline could be how Harry's personality is shaped differently. With the Marauders' influence, he might be more mischievous and confident. For example, he could learn pranks from them at a very young age and use them to outwit his enemies later on.
A third plotline might be Percy's newfound powers or abilities due to being raised by the Hunt. He could develop enhanced senses, like better vision at night or a keener sense of smell. This would not only help him in hunting but also in facing off against enemies. He could use these powers to protect the Hunt from threats that they haven't encountered before.
Well, perhaps in this fanfiction, Harry's snake -raising has given him some special powers related to serpents. For example, he could have the ability to move as silently as a snake or even use some snake -like magic that others don't possess. Also, the story could explore how his relationship with the snakes affects his relationships with his human friends. Maybe at first they're a bit put off, but later come to understand and accept this part of him.
In this fanfiction, a likely plotline could be Bella's struggle with her identity. Being raised by the Volturi, she's in a very different environment from the one she knew with the Cullens. She may have to adapt to the Volturi's strict rules and hierarchy. There could be a conflict within her as she tries to hold on to her human values while also becoming part of the Volturi world. This inner struggle could drive the story forward as she tries to find her place in this new and often menacing vampire society.