The implications are far - reaching. First, in terms of his self - discovery, he would have a unique perspective on his own magic. He might start to see himself not just as a wizard who uses magic, but as someone who can communicate with it on a deeper level. This could also affect how he views the magical creatures and objects around him. Since he can talk to magic, he may understand that there is more sentience in the magic within these things. In the context of the wizarding community, it could cause jealousy or admiration among his peers. Some may see him as a chosen one in a new way, while others may be skeptical or even hostile towards this new ability.
If Harry Potter can talk to magic in fanfiction, it could change his relationships. He might become more isolated as others don't have this ability, or he could form a new bond with magic itself, like a true friend. Also, it could mean he has a new way to solve problems. Instead of relying on books or teachers, he can directly ask magic for solutions. This could make him a target for those who fear this new - found power. Moreover, it would likely lead to a shift in the power balance in the wizarding world as he has an advantage that no one else has.
One implication is that he could gain more knowledge. Magic could tell him things like the origin of spells, which might help him become a more powerful wizard.