There could be other gods and goddesses. For example, Athena might be there to offer her wisdom to Percy as he navigates his new role. Poseidon, being Percy's father, could also play a part, maybe giving him advice on handling the power of a major god.
Some of Percy's friends like Annabeth could be in it. She might be helping Percy understand the more complex aspects of his new power. Grover could also be there, perhaps getting caught up in some time - related chaos that Percy has to fix. And there could be new characters created specifically for this fanfiction, like time - spirits or ancient time - keepers that Percy has to interact with.
Other characters could include the Titans who might be trying to take advantage of Percy's newness to the role of the god of time. The Fates could also be important characters as they are closely related to time. They might be either guiding Percy or trying to test him in some way. There could also be mortal characters who are affected by Percy's actions as the god of time, and Percy has to figure out how to deal with the consequences on their lives.
There could be his friends like Annabeth. She might be the one who first notices Percy's change and helps others to see him in a new light as well.
There could be new characters introduced as well. Maybe other gods or demigods who have a particular interest in Percy's new - found godhood. They could either be allies or antagonists, depending on their motives and how Percy's new power impacts the existing power balance in the fanfic's universe.
There could be an old gardener who mentors Percy. The gardener might teach Percy all about the plants in the garden, their needs, and how to keep the garden thriving.
I'm not sure specifically since I don't know the exact fanfiction, but it could be his friends who might be either involved in his hacking activities or completely unaware of them. Maybe there's a mentor - like figure who guides him in the world of hacking.
Besides Percy, his agent could be a character. The agent would be responsible for handling Percy's endorsements, scheduling his competitions, and dealing with the business side of his athletic career. There could also be a physiotherapist, especially if Percy gets injured during his training or competition. This person would help him recover and get back to peak performance. Another possible character is a fan. A die - hard fan of Percy who follows his every move, collects his memorabilia, and is always there to cheer him on, either at the stadium or through social media. And there could be a local sponsor who is investing in Percy and hoping for his success at the Olympics.
Grover could also be a main character. He might be at the scene when Percy gets drunk and try to use his nature - related powers to sober Percy up. Grover could also provide some comical relief with his reactions to Percy's drunken state, like his horrified expressions or his attempts to herd Percy like he would a wild animal.
The bullies themselves would be key characters. They could be the typical mean kids in Percy's school or wherever the story is set.
Often in these types of fanfictions, aside from Percy, there might be minor characters that serve as catalysts for his actions. It could be a random villager who Percy saves, which then sets off a chain of events. Or perhaps an old mentor figure who appears briefly to give Percy some advice that helps him in his one - man battles.
Well, there could be a wise old wizard who discovers Percy. The wizard takes it upon himself to protect Percy from the forces that might be after him because of his mysterious origins. He becomes like a mentor to Percy, teaching him about the magical world and how to control his powers.
A young mermaid named Ariel could be a main character. She could be Percy's friend and help him explore the underwater world. She could teach him how to swim faster and find the best hiding places from the bigger sea creatures.