Harry could also accept it gracefully. Given his character, he might respect Hermione's decision and try to maintain their friendship. He may realize that her friendship is too important to lose over unrequited love and work towards getting over his romantic feelings while still being her friend.
Another possibility is that Harry becomes a bit bitter. Although he tries to hide it, the rejection could leave a mark on him. He might distance himself from Hermione, not out of spite but because it's too painful to be around her knowing she doesn't love him back. He could focus more on his other relationships or his duties as a wizard.
He might be initially heartbroken. Harry has deep feelings for Hermione, so the rejection could come as a shock. He could withdraw into himself for a while, feeling sad and confused about why she doesn't feel the same way.
Perhaps he tries to convince her. Harry is a determined person. He might think that Hermione just needs more time or that he didn't present his case well enough. So, he could start listing all the reasons why they would be good together, from their shared history to their mutual understanding of the wizarding world. But if Hermione remains firm in her decision, he may finally have to accept the rejection and move on.
Natsu might be initially shocked and sad. He could go off on his own for a while to think about what happened. Since he's a passionate person, the rejection would hit him hard.
In the fanfic, Harry could have a range of reactions. At first, he might be in denial, thinking that Hermione is just joking or that she will change her mind. Then, when he realizes it's for real, he could get angry, feeling like he's been unfairly judged or rejected. However, over time, he may come to accept it and focus on other aspects of his life, like his fight against the dark forces or his relationships with other friends.
Well, it could lead to Harry feeling a bit heartbroken at first. But then he might focus more on his fight against the dark forces. He realizes that their friendship is more important than a romantic relationship that wasn't meant to be.
Alternatively, Ginny could be very mature about it. She might respect Harry's decision, even though it hurts. She could choose to step back and give Harry the space he seems to need while secretly hoping that he will change his mind in the future.
Sometimes, Harry might use the rejection as motivation. He could focus more on his training or other important tasks at hand, like fighting against the Dark forces. He realizes that he has bigger things to worry about than a failed romantic pursuit, and this rejection could fuel his determination to prove himself.
He might be initially in shock. Harry could stand there, unable to believe what has just happened. Then he might become angry, lashing out at his mate or the situation in general. He could say things he doesn't really mean in the heat of the moment.
Harry might be extremely hurt. He could initially feel a sense of shock and disbelief. After all, he may have started to develop some feelings of trust or kinship towards Severus. Then, he might turn to anger. Anger at being rejected, especially if he doesn't understand the reasons behind it. He could also feel a sense of loss, as if he has been deprived of a chance at a real family connection.
He may also get angry. Harry has a strong sense of justice and self - worth. Snape's rejection could be seen as unfair in his eyes, especially if he has started to develop some sort of positive feelings towards Snape. So, he might lash out at Snape or even try to prove him wrong by becoming more independent and successful on his own.
Harry might be deeply hurt. He may initially be in denial, not believing that Severus is rejecting him. After all, he may have felt a strong connection. So, he could try to reach out to Severus multiple times, hoping to change his mind.