Her life would be filled with more knowledge. She'd know about different species, planets, and historical events in a way she never did before. This new knowledge could make her more confident and assertive.
If Donna becomes a Time Lord in fanfiction, her relationships would be transformed. Her bond with the Doctor would become more complex. They could now share Time Lord experiences. Also, her relationships with her family and friends on Earth would be different. She might have to keep her new identity a secret from them, or she could use her powers to better their lives in subtle ways.
She might use her new Time Lord abilities to go on adventures across time and space, helping those in need. Maybe she'd team up with the Doctor in a different way than before, bringing her own unique Time Lord perspective to their travels.
The story would become much darker. Harry would no longer be the hero fighting for good. Instead, he'd be causing chaos and destruction. His friends would either try to save him or become his enemies.
Skye would probably become more selfless. The Avengers are all about protecting the world, so she'd have to put the greater good above her own needs. Also, her relationships would change. She might be more guarded at first, but as she bonds with the team, she'd open up more.
Naruto's character would change in several ways. Firstly, he would become more strategic. As a lord, he has to plan for the long - term development of his land, which requires thinking ahead. His impulsiveness would be curbed as he has to deal with the complex web of politics. He would also grow in terms of wisdom. He would learn from his experiences and the advice of his advisors. His charisma would be used in a different way. Instead of just inspiring his ninja comrades, he would need to inspire all his people. His sense of justice would expand from individual cases to the overall fairness of his domain, and he would strive to make his territory a model of a just society.
She might become more confident in public. As a model, she has to be in the spotlight a lot, so she would likely grow out of her shyness. For example, on the runway, she'd need to strut with confidence.
If Bella becomes a banshee, her relationship with Edward would be very different. He would be more protective of her as she has a new and potentially dangerous power. He might also be a bit wary as banshees are known for their wailing which could attract unwanted attention. With Jacob, he might see her as even more of an enigma and be more drawn to her in a way, since she's now a more powerful supernatural being.
If Arya becomes the Night Queen, her personality might become more cold and calculating. She has always been a survivor, but as the Night Queen, she would need to be more ruthless to control the White Walkers. Her sense of humor and playfulness might disappear as she takes on this dark and serious role.
Romantically, if Hermione becomes a boy, she might attract different people. Maybe some of the female students who were just friends with her before start to have a crush on her. And she would have to figure out how to handle these new romantic interests while still being true to herself and her old friendships.
If Anko becomes Naruto's maid, her character would change in several ways. Firstly, she'd have to adapt to a more submissive role, which is very different from her usual assertive self. She'd be responsible for Naruto's well - being in a non - combat way. This could make her more empathetic as she gets to understand Naruto's daily life struggles. Also, she might become more organized as she has to manage household tasks. Her relationship with Naruto would also change, and she'd be more protective of him in a different sense than just in battle.
If Kurama becomes Naruto's father in fanfiction, it could completely change Naruto's character development. He might inherit more of Kurama's powers directly. For example, he could have better control over the Nine - Tails' chakra from the start, without having to struggle as much as in the original story.