Well, perhaps it's a sleek, form - fitting armor that has the ability to change its appearance based on Percy's needs. It might start as a simple chainmail but when he's in danger, it could transform into a full - body plate armor with glowing blue accents that represent his powers. The new armor could also be enchanted to make him faster in water and more resistant to fire, which would be really useful considering the various challenges he faces in the Percy Jackson universe.
Perhaps he gets the power of astral projection. He could send his spirit out of his body to explore areas that are otherwise inaccessible or to spy on his enemies. This would be a very useful power especially when dealing with secretive foes or trying to find hidden places in the mythological world.
Some fanfictions depict Percy's armor as having a trident emblem on it, which glows when he's near water or in danger. It could be made of a combination of materials, not just celestial bronze, but also some kind of sea - gem that gives it extra power.
Often, the armor is related to the character's godly parentage. For Percy, being Poseidon's son, his armor could have elements related to the sea, such as seaweed - like patterns that are actually enchanted to protect him better in water. Fanfiction allows for a lot of creativity when it comes to these aspects of the Percy Jackson world.
Well, she could be a new demigod. Maybe someone who just arrived at Camp Half - Blood. She might have some unique powers that catch Percy's eye, like being able to control plants in a really cool way. That would be different from his past relationships and add a new dynamic to the story.
It could start with a shared adventure. They might be on a quest together and have to rely on each other to survive. For example, they are trapped in a maze created by some minor god. In the process of finding their way out, they start to understand each other better and feelings begin to develop.
There might be new gods or minor deities introduced. They could be ones that have been forgotten or ones that are from a different part of the mythological world. Their appearance could change the power dynamics in the story. They might either help or hinder Percy in his second - chance journey.
Perhaps it's a gift from his father, Poseidon. Since Poseidon has control over the sea and all things related to water, he might have some connection to a power that gives Percy wings, like as a way to help Percy reach new heights both literally and metaphorically.
In the fanfic, it could be that Percy gets Triton as a gift from Poseidon. Triton could be initially reluctant to be with Percy, seeing him as an upstart half - blood. But as they spend time together, they start to understand each other better. Triton might help Percy improve his control over water, especially in more complex and powerful ways. They could go on quests together, like finding a lost ancient sea artifact that has the power to either save or destroy the world of the sea gods.