In his relationships with new characters in the fanfiction, they might be curious about his cane. Some might assume he is weak, but as they get to know him, they would realize his strength lies beyond his physical ability to walk without a cane. This could lead to new friendships or rivalries based on the initial misperception.
His friends might be more protective of him. For example, Hermione would constantly be on the lookout for any signs of discomfort or danger for Harry. Ron would probably offer to carry things for him more often.
His friends might be initially confused. They're used to seeing Harry's face clearly, so a mask could create a sense of distance. Hermione, for example, would probably be very curious and try to find out the reason behind it right away. Ron, on the other hand, might be more laid - back at first but would also start to worry if Harry didn't explain soon.
His relationships might change. Some of his friends might not recognize him at first without his glasses. This could lead to some initial awkwardness but also force him to re - establish his connections in a new way. He might also attract new attention from characters who were not interested in him before, either romantically or as potential allies or enemies. This new social dynamic could cause him to grow as a character and develop different aspects of his personality.
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.
Well, if Snape were Harry's dad in this fanfiction, Harry's isolation might take on a different tone. He could be more conflicted. Knowing Snape is his father, a man he had such a tumultuous relationship with before, would make him question his own identity. He might be more withdrawn as he tries to come to terms with this new family truth, and his relationships with his friends might become strained as he feels they couldn't possibly understand what he's going through.
It can make him more of a physical combatant. Instead of relying solely on his wand, he becomes more hands - on. This can show a more assertive side of Harry.
It makes him more cautious. Since he knows the law, he's aware of the consequences of his actions more than ever. So he might think twice before using certain spells or getting involved in risky situations.
She can become more sympathetic. Sometimes in fanfiction, authors might give her a tragic past that makes her actions more understandable. For example, if she was wronged by the wizarding community in the past, it could justify her actions against them in the fanfiction.
It adds a whole new dimension to Draco. He might become more spiritual and connected to nature, which could lead to major shifts in his relationships and actions within the story.
He might become more in tune with nature. Since the Phoenix is a symbol of rebirth and nature in the wizarding world, Harry could develop a stronger sense of environmental magic. For example, he could be able to communicate with other magical creatures more easily, not just the Phoenix.
His character could become more detached in a way. After seeing so many people come and go in his long life, he might not form deep attachments as easily. But at the same time, he could also be more empathetic towards those facing mortality.