His abilities in alchemy would be far more advanced. He'd likely be able to create potions and elixirs with ease, having learned from Flamel. Also, his understanding of magical objects, especially those related to the Philosopher's Stone, would be greater.
One possible plot could be that Harry grows up learning ancient alchemy from Flamel. He might be trained in the secrets of the Philosopher's Stone from a very young age, giving him a different perspective on magic compared to his canon self. Maybe he'd have a deeper understanding of life - extension magic and use it to help others in the wizarding world.
Harry Potter's character, if raised by Flamel in fanfiction, would be a blend of Flamel's wisdom and his own innate courage. He would be more patient, having learned from Flamel's centuries - long experience. His sense of justice would be more refined, as Flamel could teach him about the long - term consequences of actions. He might also be more independent, as Flamel would encourage him to explore magic on his own terms, while still providing guidance when needed. This would make him a more well - rounded and formidable wizard in the wizarding world.
His magical abilities would likely develop at a much faster rate. The founders are extremely powerful and knowledgeable. They could guide Harry to discover and master magic that most wizards his age wouldn't even know exists.
Mentally, Harry would be more in tune with the Force. This would give him an edge in sensing danger and the intentions of others. His ability to resist the Imperius Curse might be stronger due to Jedi mental training. Instead of using spells for divination, he could use the Force to foresee events. And his telepathy - like abilities from the Force could be used in place of some magical communication spells.
His character would likely become more mature. Learning from Flamel, an ancient and wise wizard, would expose Harry to different values and ways of thinking. He might become more patient and less impulsive in his actions.
Harry's character would be more attuned to the deeper magics. He would be less likely to jump into things without thinking. Since Flamel is a master of alchemy, Harry might be more interested in the scientific aspects of magic. He would also have a greater respect for life and magic's power, as Flamel, with his long life, would instill in Harry a sense of wonder and caution about the forces they deal with.
He would likely become more knowledgeable in alchemy. Harry's always been eager to learn, and with Flamel as his mentor, he'd soak up all that alchemical wisdom. This would make him more confident in his magical abilities.
If raised by Newt, Harry's ability to sense the emotions and needs of magical creatures would be enhanced. This is because Newt has a great understanding of these aspects. Harry might also develop unique magical abilities that are specific to interacting with the habitats of magical beasts, like being able to create or modify suitable environments for them with magic.
In such a fanfiction, perhaps Harry would learn ancient and powerful magic from Nicholas Flamel. Flamel, being the creator of the Philosopher's Stone, could teach Harry secrets about alchemy and immortality. Harry might gain new powers and a deeper understanding of magic that could change the course of his battles against Voldemort.
Well, Flamel is an extremely old and wise wizard. If he raised Harry, Harry would be exposed to a different kind of magical culture. He could learn about the history of magic in a more in - depth way, not just from Hogwarts but from Flamel's long - lived experiences. Also, Flamel might have different ways of training Harry in magic, which could make Harry a very unique wizard compared to the original story.