Perhaps Aramis is in a romantic relationship in the fanfic. His partner says something really mean or does something thoughtless that deeply wounds his feelings. He spends time reflecting on the relationship and whether it's worth saving. He might also seek advice from his other friends on how to handle the situation.
One possible plotline could be that Aramis is betrayed by a close friend. Maybe they spread false rumors about him, which makes him feel hurt and isolated. He then has to struggle with these feelings while trying to find out who is behind it all.
In the fanfic, Aramis could be part of a group or a team. The team leader overlooks his efforts and gives all the credit to someone else. This makes Aramis feel unappreciated and his feelings are hurt. He starts to question his place in the group and has to decide whether to confront the leader or just quietly leave.
Maybe Athos is jealous of Aramis. For example, if Aramis gets more attention from a certain person they both care about, like a mutual friend or a love interest. This jealousy could lead him to say or do things that unintentionally or even intentionally hurt Aramis's feelings.
Show his actions. Maybe Aramis withdraws from social situations. He stops going to his favorite places or stops talking to the people he used to be close to. This shows that his feelings are so hurt that he wants to be alone.
One possible plotline could be about a character who has a menacing appearance but is actually kind-hearted. For example, a vampire who is misunderstood in a small town. People fear him because of his nature, but he's determined to show that he won't hurt anyone. He might start by saving a child from a dangerous situation, like a burning building. This could be the beginning of his journey to gain the trust of the townspeople.
In the fanfic, it might be set in an alternate universe where Sakura has a different personality. She could be more aggressive and competitive with Naruto. During a sparring match, she goes too far and seriously hurts Naruto. This could then be the starting point of a story about Naruto having to forgive her and them rebuilding their friendship.
One possible scenario could be that Athos made a critical comment about Aramis' skills in combat. For example, he might have said something like 'Your swordplay lacks the necessary precision lately, Aramis.' This could really hurt Aramis as he takes pride in his combat abilities. It could lead to a rift between them, with Aramis feeling betrayed by his friend's lack of support and confidence in him.
One possible plotline could be that Johnny gets injured during an extreme sports event. His friends then rally around him, and through their support, he overcomes both his physical pain and some internal demons he was facing. Maybe there's a love interest among his friends who realizes their true feelings while taking care of him.
A possible plotline could be Bendy getting hurt while exploring a new and dangerous area in the ink world. Maybe he stumbles upon a hidden trap set by an unknown entity, and this injury slows him down, making him more cautious as he tries to find a way to heal himself.
Maybe Leo has some sort of premonition or information that he believes is right, but it leads to Chris getting hurt. Like, Leo thinks that a certain magical training method is good for Chris, but it actually backfires and causes Chris pain. It could also be that there's a misunderstanding between them. Leo misinterprets Chris's actions as something malicious and takes actions against him that cause harm.
A plot could involve Sarada getting hurt in a trap set by a villain. The villain might be targeting the new generation of ninja in the village. As she gets injured, it sets off a chain of events where her friends start to investigate the incident. Sarada, while hurt, could provide some crucial clues from what she saw before getting injured. This would not only be about her physical injury but also about her mental strength as she tries to contribute to the solution while in pain.
It could be due to an unrequited love. If Aramis has feelings for someone in the fanfic who doesn't return those feelings, it can be a source of restlessness. He might be lying in bed, thinking about this person and how to win their heart, thus unable to sleep.