I'm sorry I can't directly recommend a specific 'Percy sacrifices himself for Artemis' fanfic. But you can try searching on fanfic platforms like Archive of Our Own (AO3). There are tons of fanfics there, and by using relevant keywords in the search bar, you might be able to find one that suits your interest.
The other characters would likely be filled with grief. His friends would probably feel a deep sense of guilt, wondering if there was something they could have done to stop him. Artemis herself might feel a heavy burden, knowing that Percy sacrificed his life for her. She may vow to honor his memory in some way.
Perhaps in the fanfic, there is a prophecy that states only a hero's ultimate sacrifice can save Artemis from a dark curse. Percy, being the selfless hero he is, decides it has to be him. He goes through a series of trials first, trying to find an alternative way but in the end, he has no choice. He sacrifices his life force to break the curse on Artemis. This act not only frees Artemis but also has far - reaching consequences in the Percy Jackson universe, like changing the power dynamics between the gods and demigods.
Perhaps it's when Percy actually makes the sacrifice. He stands there, facing whatever danger it is, and as he gives himself up, there's a moment of complete silence. His body might start to glow or something, signifying his life force being given away, and his friends can only watch in horror.
In fanfiction, Naruto sacrificing himself for Obito could be a very emotional and dramatic concept. It might show Naruto's ultimate selflessness, believing that Obito is worth saving at the cost of his own life. This could be due to Naruto seeing the good in Obito that others might not, like the part of Obito that was once a kind - hearted shinobi.
When Batman sacrifices himself in fanfiction, it can also be a way to explore the darker side of Gotham. Maybe his sacrifice was in vain, and the city falls deeper into crime and corruption. Or perhaps it leads to a new kind of hero emerging, inspired by Batman's last act. It could also show how the villains react, some might be glad that their nemesis is gone, while others may feel a strange sense of loss as Batman was always a worthy opponent.
One scenario could be that they are facing a powerful monster. The monster is about to strike Annabeth, and Percy jumps in front of her at the last moment, taking the fatal blow. Another possibility is that they are in a dangerous situation like a collapsing building or a sinking ship, and Percy uses his powers to ensure Annabeth's escape while he stays behind and perishes.
One possibility is that Percy sacrifices himself to save his friends and Camp Half - Blood from a powerful, unbeatable enemy like an ancient primordial god. He might use his powers to create a shield or diversion that allows everyone else to escape while he faces certain death.
Well, his sacrifice would likely have a huge impact. For Zoe, she might be filled with guilt and a new sense of purpose. The other characters like Annabeth could be deeply affected too. Annabeth might be angry at first that Percy made such a choice, but then she could use that anger to fuel her own actions in the story. His sacrifice could also inspire the other demigods to be braver and more selfless in their own quests.
Peter could sacrifice himself to stop a deadly virus from spreading. He might be a scientist who discovers that his own body can be used to create a cure, but it will cost him his life. So, he decides to go ahead with it to save the world.