A possible plot for the 'Percy Jackson Son of Thanatos' fanfic is that Percy is sent on a quest by Thanatos to find a powerful artifact that has the power to control the balance between life and death. Along the way, he meets other demigods who are either helping or hindering his progress. He also has to deal with his own identity as the son of Thanatos, which makes some other demigods and even some gods suspicious of him. This journey could be filled with battles, self - discovery, and moral dilemmas as Percy tries to decide what to do with such a powerful artifact once he finds it.
Well, a cool plot could be that Percy discovers there are dark forces in the underworld trying to overthrow Thanatos. And he has to team up with some unexpected allies, like some minor underworld deities who are also threatened by this uprising. He might have to use his skills as a demigod and his new - found connection to Thanatos to fight these forces. It could also involve Percy learning more about the secrets of Thanatos and how his own fate is intertwined with the god of death.
Another plot idea is that Percy discovers secrets about his adoption. There could be a prophecy related to him being Thanatos' adopted son that he has to fulfill. This might involve him making difficult choices between his old life as a son of Poseidon and his new role, and he may have to find a way to combine the powers and responsibilities of both.
Well, a cool plot for a 'Percy Jackson Son of Khione Fanfic' might be that Percy is sent on a quest related to his new heritage. He has to find an ancient artifact that is tied to Khione's power. Along the way, he meets other demigods who also have unique powers related to cold or ice. They initially don't trust him because of his dual parentage but as they face challenges together, they learn to work as a team. He also has to deal with the internal struggle of being different from what everyone expected him to be.
Well, perhaps in the fanfic, Percy is wrongly accused of a crime by Zeus. He then has to go on the run, all the while trying to clear his name. Along the way, he teams up with some unlikely allies, like a group of nymphs who have their own reasons for helping him. As he's on the run, he uncovers a conspiracy within the Olympian council that could change the fate of the demigod world forever.
One idea could be Percy discovering his connection to Hera later in his adventures and having to deal with the reactions of his friends. Another could be him having unique powers inherited from Hera that set him apart from other demigods.
One idea could be Percy discovering new powers related to being the son of Hades. For example, he might be able to control the shadows in a unique way that no other demigod can. He could use this power to spy on enemies or to travel quickly through the underworld.
Well, perhaps a plot where Percy has to enter Kronos' old lair to find a way to break a curse that is affecting his friends. He could face many challenges and traps there. Also, a plot where Percy discovers that Kronos had a secret plan that he now has to carry out, but it conflicts with his loyalty to the Olympians.
Maybe the son of Hades in the fanfic has a special bond with a particular type of monster that is usually associated with death, like a Cerberus - like creature. Percy Jackson and his friends are initially scared of this bond but then realize it could be used to their advantage. For example, the son of Hades could use this bond to control the monster and have it help them in a battle against a common enemy. The fanfic could also explore how the son of Hades tries to fit into the world of Camp Half - Blood while being different from the other demigods.
Another plot could involve Percy's relationship with other children of Hecate. Maybe there's a group of them that he has to lead in a battle against a common enemy. This would explore his leadership skills as well as his connection to his Hecate - related heritage. He might have to learn some ancient spells from them to defeat the foe.
One idea could be Percy going on a quest to find a lost artifact that has the power to restore a dying part of the godly realm. This would involve him facing new monsters and making unexpected alliances.
The Titans could be great antagonists. They might see Percy as a threat because of his connection to Thanatos and the power it could potentially give him. Also, some rogue underworld creatures, like powerful demons or vengeful spirits, could oppose Percy. They may not want Thanatos to have a more powerful influence through Percy.