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.
Some fanfics also focus on the psychological aspect of their relationship. Reiner and Bertholdt both have complex personalities and backstories. Fanfics might explore how they understand and support each other on a psychological level, perhaps dealing with their inner demons together.
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.
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.
In such a fanfiction, one possible reason could be his feeling of extreme isolation. After his estrangement from his family, he might have felt completely alone in the wizarding world. He was always so focused on rules and order, and when things didn't go as he planned, especially in his career and family relationships, it could have pushed him to this dark place.
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.
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.
The way the fanfiction portrays his relationships can also show despair. If his friends try to reach out but he shuts them off, it's like he's in a deep hole of despair where he doesn't believe anyone can help. And his actions, such as isolating himself in a dark place, could be symbolic of his state of depression.
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.
Fanfiction.net is also a great place to look. There are many 'Attack on Titan' fanfics there. Just type in 'Reiner x Bertholdt' in the search bar and browse through the results. However, the quality may vary, so you might need to read a few to find the really good ones.