Percy Jackson would likely still be a main character. He has such a central role in the original series that it's hard to imagine a fanfiction without him. Another might be Annabeth Chase, as she's Percy's close companion. There could also be new characters created specifically for this fanfiction, like a mysterious ultimate life form character who becomes Percy's ally or adversary.
One interesting concept could be new powers for Percy. Maybe he has the ability to control not just water but also other elements related to the sea, like the ability to manipulate sea creatures' minds on a deeper level. Another concept might be a new form of the ultimate life form, perhaps a hybrid of different mythological creatures that combines the strength of a centaur, the speed of a harpy, and the wisdom of a sphinx.
Percy Jackson could be seen as the ultimate being in fanfiction because of the potential for character development. Fanfic writers can take his basic traits like his loyalty and courage and magnify them. His loyalty could be so strong that it gives him an almost superhuman ability to inspire others to fight for him. His courage could be written in a way that he never fears any opponent, no matter how powerful. This kind of enhanced character profile can easily make him the 'ultimate being' in the world of fanfiction.
One of the top authors is 'SeaFan123'. Their stories always have a great flow and they really understand the Percy Jackson world. Another good one is 'DemigodWriter99'. They often come up with really creative plot ideas. And 'CampHalfBloodAuthor' is also great as they write in a way that makes you feel like you're right there at Camp Half - Blood.
Some fanfictions explore it through his leadership skills. They might write scenarios where Percy becomes the leader of all demigods and even some gods, leading them into battles against great threats. His strategic thinking and ability to inspire loyalty in others are enhanced, showing him as an ultimate being in terms of leadership. Also, his relationships with other characters are often deepened in fanfiction. For example, his friendship with Annabeth could be written in a way that it gives him additional strength or a special connection to Athena's wisdom, making him more powerful.
It could be Harry Potter himself. He already has many extraordinary qualities like his ability to resist the Killing Curse. In fanfiction, he could be further developed into an 'ultimate life form' by gaining more powers, such as the ability to fly without a broom or to instantly heal any wound.
A common theme is power exploration. Since Sonic is the ultimate life form, many fanfictions focus on his powers, how he got them, and how he uses them. For example, some stories might show Sonic learning new ways to control his speed or strength.
In the Percy Jackson universe, Artemis is a maiden goddess who has sworn off love. So in traditional interpretations, it's not a romantic love. However, in fanfiction, anything can happen. Some fanfictions might explore a more complex relationship between them that could be misconstrued as love, perhaps a deep friendship or mutual respect that is pushed to the boundaries of what could be considered love in a non - traditional sense.
One great 'ultimate percy jackson fanfiction' is 'The Lost Hero's Redemption'. It continues the story in a really engaging way. Another is 'Percy and Annabeth's New Adventure' which has some really cool plot twists. And 'The Trials of the Demigods' also stands out as it delves deeper into the relationships between the characters.
In Harry Potter fanfiction, the 'ultimate life form' could be a being with combined magical abilities from different species. For example, having the strength of a giant, the intelligence of a ravenclaw wizard, and the shape - shifting ability of an animagus all in one. It might also possess immortality, which is a highly coveted trait in the wizarding world.