Harry might be shocked and full of regret. He had finally come to understand Snape's true nature in the original story. In the fanfiction, if Snape tries to kill himself, Harry could feel that he had not done enough to reach out to Snape or show him some form of forgiveness or acceptance, and he would likely be deeply troubled by it.
Dumbledore, if still alive in the fanfiction, would be saddened. He had always known Snape's importance and sacrifices. His reaction might be a mix of guilt for not having been able to prevent this and a sense of loss for a valuable ally. He might also try to use his influence and wisdom to bring Snape back from the brink, if possible.
His family would likely be in shock at first. The Weasleys are a close - knit family, and even though Percy had his differences with them, they still care deeply for him. They might feel guilty for not reaching out more or for being too harsh on him during their arguments.
One possible reason could be his overwhelming guilt. Snape had a complex past, being involved in the Death Eaters and then switching sides. He might have felt that he could never truly be redeemed, especially with all the lives lost during the wizarding war that he had some part in, whether directly or indirectly. This guilt could have driven him to such a desperate act.
Well, some characters' reactions can be really complex. For example, Dumbledore's portrait might show a solemn look, as if he knew this was an inevitable outcome. The students at Hogwarts would be in a state of shock. Those who were in Slytherin house might feel a sense of loss for their head of house, even if they didn't always understand him. And Neville, he might see Snape's death as a tragic end to a misunderstood hero.
Arthur would likely be shocked and feel guilty. He might think that he has failed Merlin in some way, not realizing the full extent of Merlin's inner turmoil. He would probably become more protective and try to find out what made Merlin feel this way.
Merlin could use his magic to show Harry visions of a better future. By giving him hope, Harry might change his mind. For example, Merlin could show Harry how his actions in the future would lead to great good.
Well, Snape has always had a complex relationship with Harry. When he finds Harry cutting himself in this fanfiction, he might be angry at first, thinking it's a sign of weakness. But then, as he realizes the depth of Harry's pain, he could soften. He might start to see Harry more as a troubled child rather than just James Potter's son. Snape could use his knowledge of potions to create something to heal the physical wounds and also try to offer some form of emotional support, albeit in his own gruff way.
It might handle it by showing the psychological state of Paul very clearly. Through his internal monologues, the readers can understand his pain and desperation. For example, it could describe how he looks at his Pokemon team and feels like he has let them down, which adds to his sense of failure.
In this fanfiction, it could be that Paul is under the influence of some evil force or has been manipulated. This makes him do things that go against his true nature. As a result, he feels so guilty and ashamed that he wants to end his life. His Pokemon might be his only hope. For example, his starter Pokemon could have a special bond with him and use that bond to reach out to his heart and prevent him from going through with the suicide attempt.
Hermione would probably be very confused at first. Snape has always been a rather intimidating and strict teacher, so his sudden change in behavior would be quite a shock. She might initially think it's some sort of trick or test.
The other characters' reactions would vary widely. Ginny would be heartbroken. She might feel that Harry has abandoned not just his identity but also their relationship. Neville would be shocked and would probably feel that Harry has let down the whole school. Some of the Slytherins might be secretly glad, thinking that it removes a threat to their own ambitions. However, many of the younger students who looked up to Harry would be confused and disappointed, as he was a symbol of hope for them. Teachers like McGonagall would try to keep the school together in the face of this chaos, while also hoping that Harry would return.