Yes. There could be a fanfiction where the wine is actually a key to a hidden realm. The demigods think it's just a regular drink at first, but then they discover that it has special powers when consumed in a certain way or at a certain place. This sudden revelation of the wine's true nature can be a great plot twist.
A unique plot twist could be that the wine is a form of communication device. The demigods are unaware of this until they accidentally spill some wine and it forms a message from an ancient hero. This then leads them on a new quest to figure out the rest of the message and what they are supposed to do with this newfound knowledge, completely changing the direction of the story.
Perhaps in a fanfic, the wine is poisoned by a new enemy. But instead of killing the demigods, it gives them strange new abilities. This changes the whole dynamic of the story as they have to learn to control these abilities while also finding out who poisoned the wine and why. It's a twist that can add a lot of mystery and action to the Percy Jackson fanfiction world.
There's a fanfiction where Percy Jackson is magically transported to the Queens Blade world and discovers he has a long - lost relative there. This relative is a powerful figure in the Queens Blade realm and Percy has to navigate the complex politics and power struggles while also hiding his true identity as a demigod.
One unique plot twist could be that Percy has hidden powers from his Titan heritage that no one, not even the gods, expected. For example, he might be able to control time in a small way, which is a power not associated with his normal demigod abilities.
In 'The Traitorous Demeter', there's a major plot twist where Demeter seems to turn against Percy. This goes against the normal mother - son type relationship expected. It turns out she has been influenced by an ancient evil, and Percy has to find a way to break that influence and save her, while also dealing with the chaos it causes among the demigods.
One possible plot twist could be that Percy wearing a dress is part of a disguise to infiltrate a group that only allows females. For example, he might be trying to retrieve a powerful magical item that is guarded by this all - female group. Another plot twist could be that it's a magical curse that forces him to wear a dress until he completes a certain task, like solving a riddle or making amends with a certain deity. And perhaps the dress is enchanted and gives him special powers that he has to learn to use while also dealing with the embarrassment of wearing it.
One interesting plot twist could be that the Minotaur is actually a misunderstood creature under a curse. In some fanfictions, it might be revealed that he was once a heroic figure before being transformed. Another twist could be Percy having a secret power that he discovers while fighting the Minotaur that changes the whole dynamic of their encounter. For example, he might be able to communicate with the Minotaur's mind and find out its true motives.
Maybe Loki adopts Percy because he sees in Percy a power that could be useful for his own plans. But as time goes on, Loki actually starts to care for Percy like a real son. This would change Loki's character development throughout the fanfiction. He might start to make decisions that benefit Percy more than his own self - interested motives, which would be a huge shift for his character.
Maybe Percy loses his powers temporarily during the battle with Typhon. This would completely change the dynamic of the fight and force him to rely on his wits and the help of his friends in a whole new way. He might have to find a magical item or perform a heroic deed without his powers to turn the tables on Typhon.
A really cool plot twist might be that the reincarnated character realizes they are not just reincarnated into the Percy Jackson world randomly. They are part of a prophecy that was long forgotten. Their actions in this new life will either save or destroy the world of demigods. This would add a layer of high stakes and mystery to the fanfiction.
A plot twist could be that Percy is actually a long - lost Roman prince in disguise. His whole life as a Greek demigod was just a cover to protect him from Roman enemies. This would completely change his identity and relationships within the story.
Maybe in the fanfiction, Percy is tricked into becoming a god. A powerful enemy disguises as a friend and makes Percy perform a ritual that he thinks is for saving his friends but actually turns him into a god. Percy then has to deal with new powers he doesn't fully understand and the betrayal of those who deceived him.