Her relationship with Wally could become more strained. He might not know how to comfort her, and she could push him away because she doesn't want to be seen as weak. With the rest of the team, she might be more distant at first. They could be worried about her but she might resist their attempts to help.
One interesting 'Artemis Fowl Dies' fanfic could be one where his friends have to deal with the aftermath of his death. They might struggle to carry on his legacy and face new threats without his brilliant mind. For example, Butler could become more protective of Artemis's family and take on a greater leadership role among their allies.
In this fanfiction, it could be that Artemis is in a situation where she is about to be killed or lose her powers forever. Percy, being the selfless hero he is, takes on a deadly task to prevent that from happening. Maybe it involves facing an ancient and malevolent god who has a vendetta against Artemis, and Percy uses his unique abilities and the element of surprise to try and stop this god, but at the cost of his own life.
Perhaps a powerful and corrupted demigod could be the main antagonist. This demigod might be jealous of Artemis' power and popularity among the other demigods. He devises a plan to harm her, and Percy, being loyal to Artemis, has to give his life to save her from this rogue demigod.
One possible plotline could be that Percy sacrifices himself to save Artemis from a powerful and ancient enemy. Maybe there's a prophecy that foretells his death in order to protect her. Another could be that Percy is tricked into a situation where he has to give his life for Artemis to prevent a great disaster from befalling the world of the gods. And perhaps in his death, he becomes a symbol of heroism that changes the way the gods view demigods.
It could be a powerful Titan who has escaped from Tartarus and blames Artemis for something in the past. So he's out to get her, and Percy has to stop him at all costs, even if it means his death.
A possible plot twist in a 'Percy Dies Saving Artemis' fanfic could be that his death was not in vain, but rather a strategic move by some greater power. Maybe the Fates had planned it so that his death would create a distraction for an even greater evil that was about to be unleashed. Artemis, in her grief, could then discover this truth and be the one to take on this new threat with a new - found determination. Additionally, Percy's death could cause a shift in the balance of power among the demigods. With Percy gone, other demigods might step up in unexpected ways, and this could also play into the overall story as Artemis tries to navigate the new power dynamics in the demigod world.
In the fanfiction, perhaps Artemis decides to take on a more solo approach to her vigilantism. She may feel that with her mom gone, she can't rely on anyone else in the same way. This could lead to conflict within the Young Justice team as they try to bring her back into the fold. Also, she might start investigating the circumstances around her mom's death more closely, uncovering secrets that put her in danger.
One common plotline is the team's reaction to her death. They might go through stages of grief, with some members blaming themselves. Another could be a mystery surrounding her death, like whether it was really an accident or a planned assassination. For example, in some fanfictions, her death could be linked to a new villain who has a vendetta against the Young Justice team.
In the original series, Artemis is often the one driving the plot forward with his intelligence and unique perspective. In a fanfic where he dies, new characters could emerge as leaders. Maybe a minor character from the original series steps up and has to use different methods to solve problems compared to Artemis. Also, the power dynamics between the humans and the fairies could change drastically without Artemis there to act as a mediator or a threat.