The training could turn Harry into a more complex character. He might start to understand Voldemort's motives better, which could make him more hesitant in the fight against the Dark Lord. He could also develop a darker side of his personality, struggling between the good he was brought up with and the dark teachings of Voldemort.
Harry could become more powerful in a way that scares his friends. Voldemort's training might focus on the Dark Arts, which are powerful but dangerous. This could change Harry's magic style. He may become more solitary as his new skills and knowledge set him apart from his Hogwarts friends who follow a more traditional path of magic.
Harry in this fanfiction is likely to be more ruthless. Voldemort's upbringing would make him less empathetic. He may value power above all else and be more willing to use dark magic to achieve his goals. His relationships would also be different. He wouldn't have the same close - knit group of friends as in the original story. Instead, he might be surrounded by Death Eaters or those who follow Voldemort's ideology.
It could start with a lot of animosity on Harry's part, but as he is trained, he might start to see Voldemort in a different light. Maybe he begins to understand Voldemort's motives, though not necessarily agreeing with them.
Well, it might make him more cynical at first. After all, he has just absorbed the essence of the most evil wizard. But then he could use this newfound darkness within him to better understand the bad in the wizarding world and fight it more effectively.
In this fanfiction, the goblin training could make Harry Potter more assertive. Goblins are not afraid to stand up for themselves and their rights. Harry, being trained by them, could inherit this trait. He might become more vocal about his own needs and desires, not just following what others expect of him. He could also develop a deeper understanding of the magical underworld, which would be reflected in his more guarded and worldly character.
The goblin training could transform Harry into a more street - smart wizard. Goblins have their own set of rules and ways of doing things. Harry would have to adapt to these new ways. This could lead to him being less trusting of traditional wizarding institutions and more likely to question the status quo. His character might become more resourceful as he learns from the goblins' unique skills and knowledge.
In these fanfictions, Harry's character transformation is quite drastic. He loses his sense of morality. His loyalty, which was once towards his friends and the good side, now shifts to Voldemort. He becomes more power - hungry, willing to do whatever it takes to gain more power, including using dark magic without hesitation. He also becomes more secretive and manipulative, using his former relationships to further Voldemort's goals.
Harry might become more cynical. Since Voldemort has seen a lot of dark and cruel things, those memories could taint Harry's view of the wizarding world. He could start to question the motives of people around him more, even those he once trusted, like Dumbledore.
He becomes more conflicted. Knowing he's Voldemort's son, he's constantly in turmoil about his true nature. His confidence might waver as he wonders if he's capable of the same evil as his father.
The relationship would become extremely complex. Harry would be confused and conflicted. He's been taught all his life that Voldemort is pure evil, but now he's been saved by him. Voldemort, on the other hand, might start to see Harry in a different light, perhaps as a tool or as someone with whom he can form an unusual bond. It would be a relationship full of mistrust on Harry's part and manipulative intentions on Voldemort's.
The relationship would become extremely complex. Harry would no longer be able to simply see Voldemort as pure evil. He would be in a state of confusion and moral dilemma. Voldemort, on the other hand, might start to view Harry as a more interesting pawn rather than just an enemy to be killed. They could develop a strange sort of respect for each other, at least on a surface level.