What could make Percy get angry on the Argo 2 in fanfiction?

If the gods were to interfere with her plans for the hunters without her consent. Artemis is very protective of her hunters and their way of life. Any meddling from the other gods in her domain could easily enrage her in a fanfiction scenario.

They might face new and strange monsters. For example, they could encounter a sea - serpent that has the power to control the weather around the Argo 2. Percy would use his water - controlling abilities to try and fend it off while Annabeth comes up with a strategic plan to defeat it.

Maybe he's missing his family. He's been away from them for a long time on the Argo 2, and homesickness could hit hard and make him cry.

Well, he might be unable to perform his duties on the ship for a while. His friends would surely be worried sick and would probably do everything they could to nurse him back to health. Maybe Annabeth would take charge of his care, using her wisdom to find the best way to heal him.

Well, it could be about Percy and Annabeth having some sweet, romantic moments on the Argo 2. Maybe they're sharing secrets, or just enjoying the journey together while facing some minor challenges on the ship.

In a fanfiction, Natsu might get angry if he was wrongly accused of something. Say, if he was blamed for a crime he didn't commit in the guild or in the magical world at large. He's an honest person, and being falsely accused would be a huge blow to his pride. Another possible reason is if a magic - based experiment went wrong because of someone else's carelessness and it put his friends in danger. Natsu values the safety of his comrades, and such a situation would make his blood boil. Also, if someone were to try and break up the Fairy Tail guild by causing internal disputes, Natsu would be enraged as he loves the unity and spirit of the guild.

Perhaps Kushina made a choice that Naruto felt was unfair to him. Like if she gave away something that was rightfully his, it could make him angry.

One possible reason could be betrayal. If her friends, say Ron or Harry, were to lie to her about something really important, like a secret mission or a hidden danger, that would make Hermione furious. In fanfiction, her loyalty to her friends is often a central part of her character, and any threat to that trust could lead to her anger.

Jason is likely to be another main character. Since he has his own set of skills and knowledge, he might have an interesting relationship with Percy in this story. Maybe he's a bit jealous at first of Percy's control over the ship, but then they end up working together really well. And of course, Piper could be there too. She might use her charm - speak abilities to help the crew communicate with any strange creatures they encounter during Percy's time controlling the Argo 2.

One possible reason could be that hunters have been interfering in Percy's quests. If they show up uninvited and start taking over or causing chaos, Percy would get angry. For example, if they start hunting a monster that Percy has been tracking for a long time.