Percy is the main focus, no doubt. The tigers are key characters as they shape Percy's early life. There could also be some antagonist characters. Maybe there are hunters who want to capture the tigers or Percy because they see them as a threat. Or perhaps there are other demigods who are jealous of Percy's unique abilities that he gained from being raised by tigers and they try to cause trouble for him.
Obviously, Percy Jackson himself would be the main character. The tigers that raise him would also be important characters. They could be like his family in the story.
Maybe Percy would grow up with the instincts of a tiger. He could be super fast and stealthy like them. And perhaps he'd have a special bond with the tigers that would help him in battles against monsters, just like how his demigod powers usually do.
Obviously, Percy Jackson would be the main character. But there could also be some wild spirits or minor gods that take on a mentoring role for him, like a dryad who teaches him about the plants in the forest.
Well, obviously Percy Jackson and Jason are the main ones. Given that it's a bashing fanfic, they will be at the center of the story. Their actions, personalities, and relationships will be the focus.
Obviously, Naruto and Erza would be the main characters. Naruto is the young ninja with a lot of potential and a big heart. Erza is the strong and capable character who takes on the role of raising Naruto. There might also be other characters from Naruto's world or Erza's world that make appearances, like Naruto's friends from Konoha in cameo roles, or Erza's guildmates who interact with Naruto as he grows up.
Obviously, Percy would be one of the main characters. Chaos, who raises him, would also be very important. There might also be some other primordial beings that interact with Percy during his upbringing.
Probably other demigods would interact with Percy. Maybe some demigods who are in need of a more stable influence in their lives would seek out Percy. Also, characters like Grover might find Percy in Hestia's care and there would be a reunion. And the gods and goddesses who are associated with the concept of home or family in Greek mythology, like Demeter, could also have interactions with Percy.
Well, it could be about Percy learning to survive in the wild using his demigod abilities in unique ways. Maybe he discovers new mythical creatures that are only found in the wild areas he's in.
Percy Jackson himself would obviously be a main character since it's a 'Reborn Percy Jackson Fanfiction'. His friends like Annabeth Chase are also likely to be main characters. She could play a crucial role in helping Percy adjust to his new life after being reborn. Grover would probably be there too, still being Percy's loyal friend. And the gods, especially those who have a connection to Percy like Poseidon, would also be important characters as they might have different reactions to Percy's rebirth.
Some of the likely characters could be the regular mortal kids at Percy's school. They might not understand his differences and bully him because of his ADHD and dyslexia. Another possibility is some jealous demigods who envy Percy's popularity or his special abilities.
A possible new character could be an oracle - like figure who is not from the traditional Delphi but is a seer on Olympus. This character could give Percy cryptic prophecies that are related to the future of Olympus and the demigod world. There might also be a group of centaurs who are specifically trained to protect Percy and serve as his advisors, different from the ones at Camp Half - Blood.