Some fanfictions might also include gods or goddesses from the Percy Jackson universe. They could either be there to offer assistance or to create more obstacles for Percy. For instance, Poseidon might show up to give Percy some advice or a special gift that would help him in his journey within the Tree of Life.
There could be new characters created specifically for the fanfiction. For example, a spirit guide that lives within the Tree of Life and helps Percy understand its mysteries. This character might have unique powers and a deep connection to the tree. Sometimes, antagonists are also introduced. It could be a dark wizard who wants to steal the power of the Tree of Life for his own evil purposes and constantly tries to thwart Percy's plans.
The most common character is obviously the tree itself. Then there are often animals like birds, squirrels, or deer that interact with the tree. Sometimes, there might be a forest spirit or a dryad that has a special connection to the tree. There could also be humans, such as a woodcutter or a wandering traveler who stumbles upon the tree.
Gary could be a common character in such fanfiction. Since he's Ash's long - time rival, it makes sense for him to show up at the Battle Tree. He might be there to test his skills against Ash or to prove himself as a better trainer.
Some fanfictions might also include new characters created specifically for the story. For example, a mysterious wizard who helps Percy understand the magic of a particular region he is in. This wizard could have his own motives and secrets that add more depth to the story.
Another storyline could be Percy being called by the Tree of Life itself to become its protector. He would then have to learn about the tree's secrets and how to fend off threats from dark forces that want to destroy it. He might have to train with the spirits that inhabit the tree and gain new powers in the process.
Well, of course, Percy Jackson himself often makes an appearance. He could be a mentor figure to the adopted son, guiding him through the ropes of being a demigod. Annabeth is also common, perhaps helping the adopted son with her wisdom and knowledge of the mythological world.
Percy Jackson himself is, of course, a common character. Annabeth Chase often appears as well, as she has a significant relationship with Percy in the original series and is likely to be part of the harem in these fanfictions. Grover might also show up as Percy's friend, providing some comical relief and support in the story.
Percy Jackson himself is very common, as the main character of the original series. Writers often like to put him in new and chaotic situations.
Chiron is also likely to be a common character. He would be the one to help Percy adjust to his new identity as a son of Demeter. And there could be antagonists too. Maybe some monsters that are specifically targeting Demeter's children because of their connection to the earth and its resources. They could be trying to disrupt the balance that Demeter's children help maintain.
Common characters include Percy Jackson, of course. Then there's often Annabeth as she is Percy's main love interest in the original series. Some fanfictions might also feature Clarisse La Rue, adding some conflict to the harem dynamic as she and Percy have had their differences in the past. Gods and goddesses like Aphrodite might also make an appearance, perhaps using her powers of love and beauty to either enhance or disrupt the hypnosis harem situation, given her domain and nature.
In many of these fanfictions, characters like Chiron, the centaur mentor, play important roles. Since Percy is now the son of Chronos, some of the Titans might also be common characters, either as allies or enemies depending on the plot. And of course, the gods of Olympus are likely to be involved as they have a connection to Percy's new identity.