Perhaps in the fanfiction, Percy's death is a sacrifice that was misinterpreted. The gods thought it was necessary for some greater good, but it actually throws the world into chaos. His friends then have to find a way to bring him back and restore order.
Another plotline could be that Percy's death is part of a power struggle among the gods. Some gods see him as a threat and kill him, which then leads to a war between different factions of gods, with Percy's friends caught in the middle trying to make sense of it all and figure out how to stop the war.
Well, it could start with Percy being framed for a crime he didn't commit by the gods. This false accusation makes him feel extremely betrayed. He then has to go on the run while trying to prove his innocence. Along the way, he meets other outcasts and together they form a resistance against the gods. They might try to find a way to hold the gods accountable for their actions and create a new order where demigods are treated more fairly.
Well, the fanfiction might show Percy being betrayed in a very personal way. For example, a god he trusted deeply, like Poseidon, could turn against him for some political reason among the gods. Percy would then be heartbroken and angry. He might embark on a journey to find a new purpose, away from the world of the gods. Along the way, he could meet new characters who help him see the true nature of the gods and himself.
Maybe Percy unknowingly breaks some ancient and very strict laws of the Gods. For example, he might interfere with some sacred rituals or places that are off - limits to mortals, even demigods like him. In the fanfiction world, the Gods could be very unforgiving when it comes to such violations and decide to kill him as a result.
One possible plotline could be that Percy has been betrayed by his closest friend. Maybe this friend revealed a big secret of Percy's, and now Percy feels isolated and heartbroken. He might start to question his relationships and his place in the world.
One possible plotline could be Percy's friends trying to break him out. They might have to overcome various obstacles like guards, traps, and security systems within the prison.
One possible plotline could be Percy challenging the gods' unfair rules. For example, he might snap at them for always using demigods as pawns in their games. Another could be Percy standing up for the rights of other minor demigods who are often overlooked by the gods. Maybe he decides to form a sort of demigod union to negotiate with the gods for better treatment.
One possible plotline could be that Sonic is facing a new and extremely powerful villain who manages to outwit him in a battle and ultimately kill him. This could lead to his friends, like Tails and Knuckles, vowing revenge and setting out on a journey to become stronger to face the villain.
One possible plotline could be that the villagers, out of long - held fear and jealousy of Naruto's growing power, band together in a mob. They might ambush Naruto when he is least expecting it, perhaps on his way back from a mission. Another could be that they are influenced by a powerful and evil - minded individual who manipulates them into believing Naruto is a threat to their safety.
One possible plotline could be that Tails is killed by a powerful enemy during a battle to protect his friends. Maybe a new, extremely strong villain emerges and Tails sacrifices himself to buy Sonic and the others time to escape. Another could be that there is some sort of accident in Tails' workshop while he is working on a dangerous experiment, leading to his untimely death. It could also be that in a dark alternate universe, Tails is targeted and assassinated by an evil organization that wants to disrupt the balance of power in the world he lives in.
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.