One possibility is that Percy trains his powers with the help of his friends. They could create special scenarios or obstacles for him to overcome, which in turn helps him to develop his powers further. His powers could also start to evolve in unexpected ways during this training process.
Maybe there are some dark forces at work. They sense Percy's growing power and want to stop him before he becomes too strong. These could be ancient evils that have been awakened by Percy's power development. They could send minions or create illusions to make Percy's training difficult.
Well, perhaps Percy could be learning some new and powerful combat skills from Chaos. Maybe Chaos teaches him to manipulate chaos energy in unique ways for battle.
One possible plot could be Percy learning unique survival skills while training in Alaska. Maybe he has to deal with extreme cold, wild animals like bears or wolves. He could also meet local Alaskan characters who teach him their traditional ways of living and hunting, which in turn enhance his own training.
Perhaps the fanfiction could be about Naruto training Percy in stealth. Percy, being a demigod, often charges into battle head - on. Naruto, on the other hand, is a master of stealth. He could teach Percy how to move quietly and undetected. This would be a great advantage for Percy when he has to infiltrate a monster's lair or spy on the enemy. The story could show Percy struggling at first but gradually getting better with Naruto's guidance.
Well, it could be about Percy facing some new and unique challenges while training in isolation. Maybe he discovers a new power within himself during this alone time. He could be training to master a new weapon or combat style, like learning to fight with a double - edged sword that has some special powers. And he might encounter some mythical creatures that are drawn to his solitary training, which he has to fight off while still trying to improve his skills.
One possible plot could be Percy going on a solo quest specifically designed to help him master his powers. He might face challenges that force him to use his water - based powers in new and extreme ways, like having to freeze an entire lake to stop a monster from escaping. Along the way, he could meet a new mentor, perhaps an ancient water spirit, who teaches him secrets about his abilities that he never knew before.
Well, in most fanfictions where Percy trains in Tartarus, it often involves him facing extreme challenges. He might be learning to control new powers or just surviving the harsh environment. For example, he could be training to fight stronger monsters that lurk in Tartarus.
In the fanfic, Percy might show off his powers in a competition among demigods. He would display his combat skills along with his unique powers, like being able to communicate with sea creatures to gain an edge in the contest.
He might lose control of his abilities. For example, if his power is related to water, he could cause unexpected floods that harm innocent people or damage the surrounding environment.
It could be some of the other trainees who are jealous of Percy's progress and his special relationship with Chaos.