In this fanfiction, Ash's personality might change in a way that he becomes more in tune with nature and other Pokémon. The Pikachu ears and tail could give him a different perspective on the world of Pokémon. He may start to communicate more like Pikachu, using simple sounds and gestures. This could make him seem a bit more wild or untamed at first, but as he learns to control his new form, he would blend his old personality with the new traits, becoming a more complex and interesting character.
One possible plot could be that Ash wakes up one day to find he has Pikachu ears and a tail. He initially panics but then realizes he can use these new features to better understand Pikachu. For example, he discovers he can sense electricity in a similar way to Pikachu, which helps them in battles. His friends are both shocked and amused at first, but they soon see the advantages.
His relationship with Sasuke could be affected. Sasuke might be initially intrigued by Naruto's new look but also see it as a sign of Naruto getting stronger without him. This could fuel his rivalry even more.
He might become more cautious. Usually, Ash is quite bold and rushes into things. But if he's in a Team Rocket - centered fanfiction, he'd likely be more careful as he's constantly surrounded by danger. For example, he'd think twice before challenging a new Pokemon or entering an unknown area.
In this fanfiction, Ash's training style would likely change significantly. Since a female Pikachu might have different energy levels or responses to training stimuli. He may need to be more gentle and patient. Instead of pushing her too hard in intense physical training, he might focus more on mental training and strategy building. Also, he might need to take into account her social needs as a female Pokémon, like allowing her more time to interact with other Pokémon in a positive way during training breaks.
With Sakura, she might be a bit more protective at first. She could see Naruto as more vulnerable because of his new features that make him stand out. But as time goes on, she would also rely on him more in battles as his fox - like abilities prove useful.
The power of its electric attacks would be magnified. It could release bolts of lightning that are not only more powerful but also have a wider range. Maybe it could even control the direction of the lightning more precisely, hitting multiple targets at once.
His relationship with Sakura might change. At first, she could be shocked and a bit put off by his new appearance. But as she realizes it's still Naruto, she would probably start to accept it and might even find the fox ears kind of cute in a way. With Sasuke, Sasuke might be more indifferent on the surface but secretly be curious about how Naruto got this way.
Ash's personality could shift to be more protective. Lugia is known as a guardian of the seas, and in his transformed state, Ash might feel a stronger sense of responsibility towards other Pokemon and the environment. His competitive streak, which is a big part of his normal personality, could be toned down as he now has much greater power and a different role to play in the Pokemon world. He would also have to deal with the isolation that comes with being such a powerful and different being, which could make him a bit more introverted.
Well, Ash is known for his adventurous and curious nature. In Mewtwo's body, that adventurous spirit might be redirected. Instead of running around exploring physically, he might use Mewtwo's psychic powers to explore the minds of other Pokemon or discover hidden places in the psychic realm. His personality would also become more complex as he'd have to deal with Mewtwo's memories and emotions. He'd still be the same Ash at heart, but there would be an added layer of depth and thoughtfulness, perhaps a bit of melancholy too as he'd understand Mewtwo's pain of being created for the wrong reasons. And his interactions with other Pokemon and humans would be different. He might seem more intimidating at first because of Mewtwo's appearance, but as soon as he started to communicate, his friendly and helpful Ash - like personality would show through.
Ash's personality could become more diplomatic as a girl. In the Pokémon world, he would need to navigate different social situations. As a girl, he might use charm and persuasion more often. His love for Pokémon would still be there, but he could show it in a more gentle way. For example, instead of just being excited about catching new Pokémon, he might focus more on the well - being and happiness of the Pokémon he already has.