It could change his relationships. If the device has some unique function like showing a person's true intentions, it might make Harry more cautious about who he trusts. On the other hand, it could also help him strengthen his bonds with his true friends. For instance, if it can record and replay memories, he could share more intimate and important moments with Ron and Hermione, deepening their friendship even further.
If the device in the fanfiction is a time - traveling gadget, it could completely transform Harry's life. He could go back in time to learn from the founders of Hogwarts, understand the origin of certain dark magic, and use this knowledge to prevent future disasters in his own time. It would also give him a chance to meet his parents and gain a deeper understanding of his own heritage.
It could be a magical time - traveling device. Maybe it allows Harry to go back in time to change certain events in the wizarding world, like preventing some of Voldemort's early atrocities.
His life might become more self - contained. He'd have to rely more on himself without the big support system of Hogwarts. He might become more resourceful, like finding new ways to cook with limited space and resources in the tiny house.
If Harry receives a 'tre', his character might become more inquisitive. He's always been curious, but this new thing would drive him to ask more questions, dig deeper into the mysteries of the wizarding world. He would likely become more independent in his search for answers as he tries to figure out what the 'tre' is all about.
His life would change drastically. He'd have to balance learning about chakra with his regular Hogwarts studies. His relationships with his friends might shift as they react to his new power. And he'd be more in - demand for fighting against dark forces, as he'd have an extra edge with chakra.
He could become more confident. With the new resources from his inheritance, he feels more secure in his place in the wizarding world. For instance, if he inherits a lot of gold, he doesn't have to worry about financial problems at Hogwarts.
His life could change drastically. He might start to see the magical world in a different light earlier than in the original. For example, he could meet some early allies or enemies right after getting the letter.
When Harry Potter becomes part phoenix in fanfiction, his relationship with the magical world around him would shift. He could communicate with other phoenixes in a way normal wizards can't. This would give him access to knowledge and secrets that are hidden from others. Also, his role in the wizarding community would become more special. People would look at him not just as the boy who lived, but as a unique being with the powers of a phoenix. He might be seen as a symbol of hope and renewal, much like the phoenix itself.
His daily routine would be completely different. Instead of going to classes like Potions and Transfiguration, he'd be in Math and History classes. He might feel bored at times because he's used to the more exciting and magical learning at Hogwarts.
It could change his life by giving him a new form of magic. For example, he might be able to combine the power of the stand with his existing magic, making his spells more powerful.