There could be an older student who is kind and has a sense of justice. This student might see what's happening to Annabeth and decide to help. They could use their influence among the students to put an end to the bullying. Maybe this older student has been through something similar before and doesn't want Annabeth to suffer the same way.
Her family could be a great help. If they are aware of the situation, they can step in. Maybe her parents can talk to the school authorities or even directly to the bullies' parents. Family support is always crucial in such situations.
Well, she might consider making some new friends who are strong and kind. In the 'annabeth gets bullied at school fanfiction', if she has a group of friends by her side, the bullies might be less likely to target her. Friends can also give her support and make her feel better. For example, they can stand up for her when the bullies are around or just be there to listen when she's feeling down about the bullying.
Maybe an antagonist who wants to disrupt the group dynamic. If Annabeth is a key part of a group, punching her could cause chaos and confusion among her friends. It could also be someone who has been influenced by dark magic or some sort of mind - control in the fanfiction. This would make them act against their normal nature and punch Annabeth without really having a personal grudge.
It could be that Annabeth has a misunderstanding about Percy. She might think he's a threat to her position or status at the camp, so she bullies him to try and keep him in check.
Percy might be one. They have a close relationship, and in some fanfictions, he could be more forward with his feelings through flirting.
Well, it depends on who is flirting with her in the fanfiction. If it's someone she doesn't like, she'll probably be dismissive and give cold responses. However, if it's someone she has a bit of an interest in, she could be coy and a bit shy while still maintaining her confident facade.
It could be an enemy from the underworld. Maybe a powerful demon or a vengeful spirit that has a grudge against her. They might use their dark powers to harm her, like sending a bolt of dark energy her way.
Maybe it's a human who has somehow discovered the world of demigods and is afraid of their existence. They shoot Annabeth out of fear and misunderstanding. Another option is that it's a rogue demigod who has gone bad and is working against their own kind. This character could have a personal grudge against Annabeth specifically, perhaps because of her intelligence and leadership skills which they envy.
One possible consequence could be social isolation. Her peers might judge her harshly, leading to her being ostracized at school. Also, her academic performance would likely be affected as she'd have to deal with the physical and emotional stress of pregnancy.
One example could be a situation where Annabeth sees Percy getting a lot of attention from a new girl in their group. She might start acting cold towards Percy, which is a classic sign of jealousy in fanfiction. In such a story, the author might explore her insecurities about her relationship with Percy.
Percy would probably be an important character. He's Annabeth's close friend and love interest. His reaction to Annabeth getting her period could be interesting, like he tries to be supportive but is a bit clumsy at first.