Harry might become more conflicted. He'd be exposed to Grindelwald's ideas which could make him question the black - and - white view of good and evil he had before. His confidence could waver as he's no longer in the familiar Hogwarts environment.
Harry's character would likely experience a significant transformation. Growing up with Grindelwald, he would be surrounded by a different set of values and magic. He might initially seem more aloof and calculating, having been taught by Grindelwald's methods. However, deep down, his inherent goodness might still be there. As he learns more about Grindelwald's true nature and plans, he would start to struggle. This struggle could lead to him becoming a more independent thinker. He might develop a new sense of justice that is a blend of what he learned from Hogwarts and his experiences with Grindelwald. His relationships with other characters would also be affected. He might be shunned by some of his old friends from Hogwarts, but at the same time, he could make new allies who see the potential for good in him despite his upbringing.
His character could develop in a very complex way. At first, Harry might be influenced by Grindelwald's charisma and power. He could become more withdrawn from the traditional values he held. But as he grows, he might start to resist. Maybe he'd use some of the knowledge Grindelwald gave him, but for good. For example, he could learn advanced defensive magic from Grindelwald and then use it to protect those who are being oppressed by Grindelwald's followers.
At first, it might be a relationship based on Grindelwald's self - serving motives. He sees Harry as a tool. But as they spend time together, there could be moments of mutual understanding. Harry might start to see Grindelwald not just as a villain but as someone with complex ideas.
He could develop a more cunning side. Bellatrix is a sly character, and Harry would need to learn to be crafty to survive in her world. This would be a big change from his usually straightforward and brave self. For example, he might learn how to deceive Death Eaters or other threats.
His character would likely become more conflicted. Harry was always a symbol of good in the original series, but under Grindelwald's influence, he'd be exposed to different ideas of power and control. He might start to question his own beliefs.
She might start off as a bit of an outcast. With her family name, she would be shunned by some. But as she experiences kindness from others, she could start to become more confident and less ashamed of her heritage. For example, if she meets a kind teacher at Hogwarts who encourages her to be her own person.
Harry's character would likely become more conflicted. He'd be exposed to Grindelwald's radical ideas, which might make him question the values he learned at Hogwarts. His sense of right and wrong could be blurred, and he'd have to struggle to hold onto his true self.
At first, their relationship might be one of student - teacher, with Harry being curious and Grindelwald being manipulative. Harry would be eager to learn from Grindelwald's vast knowledge, but gradually he would start to sense that something is not right.
Harry might start off as a bit naive about the darker aspects of magic. But as he is trained by Grindelwald, he becomes more aware of the grey areas in the wizarding world. His character could become more conflicted as he is exposed to Grindelwald's teachings. He may question his previous beliefs and values.
In a 'Grindelwald Adopts Harry' fanfic, Grindelwald could be seeking to create an heir of sorts. He adopts Harry when he is very young. Grindelwald might expose Harry to a world of magic that is different from what he would have known at Hogwarts. Harry could be taught magic that is more about power and control. However, as Harry gets older, he might discover the truth about Grindelwald's dark deeds and his plans for the wizarding world. This could lead to a great internal struggle within Harry as he has to choose between the man who raised him and what he believes is right for the wizarding community as a whole. There could be a lot of drama as Harry tries to find his place and figure out his true identity in this new and rather dark scenario.
At first, it would probably be very tense. Harry would be suspicious of Voldemort's motives, and Voldemort would be cautious of Harry's potential to rebel. But as time goes on, they might develop a strange sort of understanding. Harry could start to see Voldemort as more than just a pure evil figure, and Voldemort might start to view Harry as something more than an enemy.
Harry would probably become more conflicted. His views on good and evil would be severely tested. Hermione might become more cunning as she tries to outwit Voldemort while living under his roof. Voldemort himself might develop a strange sort of attachment to them, which could make his actions even more unpredictable.