Well, he might discover new magical creatures unique to Atlantis. Maybe he'll form an alliance with some underwater beings to protect Atlantis from an unknown threat.
He might discover new sea creatures that are unique to Atlantis. Maybe he'll find a hidden school of magic there, or encounter ancient sea gods who have been forgotten by the outside world.
Well, he could encounter unique mythical creatures that are specific to the woods. Maybe he'll find a hidden grove protected by dryads where he has to prove himself worthy to enter. It could also be that he discovers an ancient magic in the woods that helps him in his quests.
He could be involved in some really cool quests. Like finding some ancient artifact that's hidden deep within Olympus. He'd probably make new friends among the minor gods and goddesses. And of course, there would be the constant threat of some ancient evil trying to take over Olympus, and he'd be right in the middle of the fight to defend it.
Percy could discover ancient and forgotten temples or shrines in the wild. These could hold powerful artifacts or be the lairs of minor gods or spirits. He might have to face various traps and puzzles to explore them fully. In the process, he would rely on his skills as a demigod, like his ability to control water, to overcome obstacles and uncover secrets. This would be an exciting addition to the fanfiction as it would add new elements to the Percy Jackson universe.
Well, he might encounter unique creatures. Maybe he'll befriend a magical deer that helps him find rare herbs for his ninja training. He could also build a really cool tree - house as his hideout, and use natural elements like vines and branches to set up traps for any potential enemies.
In the fanfiction, living in the sea could give Percy a chance to explore the secrets of his water - related powers more deeply. He could learn to control the tides in a more precise way or communicate with the very essence of the ocean. He might also face challenges such as dealing with underwater magic that is different from what he's used to on land. There could be ancient sea spells that he has to decipher in order to save the sea from a dark force.
He could have adventures with the local wildlife. Maybe he has a close encounter with a moose or a bear. Or he could be exploring the vast, icy landscapes and discover some hidden caves filled with ancient artifacts.
In fanfiction, Ash could have many new Pokemon adventures in Kalos. He might meet new Pokemon species unique to Kalos, like Greninja. He could also face off against new trainers with different battle styles. And perhaps make new friends along the way who help him understand the Kalos region better.
Well, he might explore the magical places in France like Beauxbatons Academy. He could meet new wizards and witches, learn different magic spells that are unique to the French magical community. Maybe he gets involved in some sort of mystery related to an ancient French magical artifact.
Well, it could involve Percy having a unique connection to the lost city. Maybe he discovers some ancient powers there that are tied to Atlantis' history. He could meet Atlantean characters who have been waiting for his arrival, thinking he's some sort of prophesied hero.