Team Rocket is a likely candidate. They're always up to no good and hypnotizing Ash would be just another devious plan for them. They could use it to finally capture Pikachu. Giovanni, as their leader, might also be involved in such a scheme. Another character could be a powerful and envious trainer who wants to eliminate Ash as competition by hypnotizing him and making him lose his skills.
There could be some new, made - up villains in the fanfiction. These villains might have special powers related to hypnosis. They see Ash as a threat to their plans in the Pokémon world, so they hypnotize him. Or perhaps an old acquaintance of Ash who has turned bad due to some reason decides to use hypnosis on him. It could also be a Pokémon with psychic abilities that accidentally hypnotizes Ash while trying to communicate or protect itself.
In certain fanfictions, a Pokémon professor or an authority figure in the Pokémon world could betray Ash. They may have their own secret agendas. For example, a professor might use Ash's research data without his permission or manipulate him into dangerous situations for their own experiments. This would make Ash feel extremely betrayed as he looks up to these figures for guidance.
Gary Oak could be a likely betrayer. He has always been Ash's rival, and in some fanfiction, he might take things too far and betray Ash in a crucial Pokémon battle, like using underhanded tactics to win. This would surely make Ash cry.
Ash Ketchum himself is of course a central and great character. Pikachu is also really important as his constant companion. Then there could be some original characters created in the fanfiction that are really interesting, like a mysterious Pokémon trainer who has a unique way of battling.
Some fanfictions might have Misty betray Ash. Perhaps she gets lured by the promise of power or some valuable reward. She could be tricked into believing that Ash is no longer the friend she thought he was and that betraying him is for the greater good.
In this fanfiction, Gary could be an important character. Since he has always been in competition with Ash, he might have mixed feelings about Ash being the chosen one. Serena could also be a main character. She might be inspired by Ash's chosen - one journey and decide to follow him, offering her own skills and support. Professor Oak would likely be involved as well, guiding Ash with his vast knowledge of Pokémon.
Ash Ketchum is the central figure in 'The Secret Life of Ash Ketchum Fanfiction'. Since it's about his secret life, he is the main focus. Pikachu is bound to be there as his sidekick. In addition, antagonists from the Pokémon world could also be main characters in the sense that they create conflict in Ash's secret life. For example, Team Rocket might be more menacing or have different motives in the fanfiction.
The rivals of Ash's daughter are usually popular characters in the fanfiction. They can be other young trainers who are either jealous of her abilities or simply competitive. Some fanfictions might also introduce unique side characters like a mysterious old trainer who gives her valuable advice or a young Pokémon healer who becomes her close friend. These characters add depth and variety to the story.
Ash Ketchum is the central figure. His harem likely consists of various characters. For instance, Dawn, who is a skilled Pokémon coordinator. She might be part of the harem and brings her own unique personality and skills. May could also be one of the main characters in the harem, with her knowledge of Pokémon contests. And of course, there could be other new or less - known characters added to the harem in different fanfictions.
Maybe a new, mysterious villain who has a grudge against Ash or wants to use his skills for their own evil purposes. This villain might be from a far - off region and has special powers that allow them to hypnotize people. They see Ash as a useful tool to carry out their plans in the Pokémon world.
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.