It could also be related to his self - preservation in the wizarding society. In a world full of magic and danger, showing too much emotion might be seen as a weakness. Harry, being aware of this, decides to shut out his emotions to appear stronger. He has faced a lot of scrutiny and jealousy from some students and even some adults in the wizarding world. By suppressing his emotions, he hopes to be more respected and less of a target.
The romances in the Harry Potter series would be non - existent. The slow - burning love between Ron and Hermione or the unrequited love of Snape for Lily would be completely absent. Instead, interactions would be more matter - of - fact. For instance, if Ron and Hermione were to go to the Yule Ball together, it would be just for the sake of following the social norms of Hogwarts, not because of any budding feelings.
It could be a very different take on the Harry Potter universe. Without emotions, the characters might seem robotic. For example, Harry's fight against Voldemort could be more like a strategic battle without the emotional drive of revenge or protecting his friends. It would be a cold, calculated world where magic is just a tool and not something that is tied to the characters' feelings.
In terms of his romantic relationships, if there are any in the fanfiction, it could be a major obstacle. Shutting out emotions means he may not be able to fully open up to a potential partner. This lack of emotional availability can make it difficult for the relationship to develop. For example, if he has feelings for Ginny, his inability to express his emotions might make Ginny feel unwanted or unloved, even though Harry might actually care deeply.
Through detailed descriptions of body language. For example, if Harry is mortified, you can write about how he blushes deeply, his eyes dart around nervously, and he fidgets with his hands or his robes. This physical manifestation of his mortified state can be very effective in getting the emotion across to the readers.
One possible reason could be to protect himself from the pain and loss he has endured. After all he's been through, like the death of his parents, Sirius, and so many others, turning off his emotions might seem like a way to avoid further hurt.
It shows Harry's pain. For example, if he's dealing with survivor's guilt after the Battle of Hogwarts. He's alive while so many died. This makes him question his own worth. It's a complex emotion that fanfiction can dig into deeply.
In a story where Harry Potter has no emotions, his relationships would be greatly affected. Hermione and Ron might be constantly puzzled by his behavior. For instance, when they celebrate a victory, Harry doesn't show any joy. This could create a lot of tension within the trio. Also, his lack of fear could make him take extremely dangerous risks without hesitation. Maybe he would walk into a room full of Death Eaters without any concern for his safety, just because he doesn't feel the normal human emotions that would stop him.
Well, it could enhance his friendships. For example, he'd be able to tell when Ron or Hermione were feeling down and offer immediate comfort. It might also make his enemies more wary of him, as he could sense their malicious intents. He could use this ability to his advantage in the wizarding battles, being able to anticipate his opponents' moves based on their emotions.
Often, they show extreme grief. For example, Hermione might be completely devastated, unable to focus on her studies or magic research like she used to. Her character could become more withdrawn as she mourns Harry's death.