He could receive it from a powerful wizard or sorceress. They recognize his need for a more powerful weapon in his upcoming battles, and the giant sword is the perfect choice. They might give it to him after he completes a difficult task for them.
It's possible that the sword was forged specifically for Percy by a master blacksmith who is also a demigod. The blacksmith realizes Percy's importance in the fight against the dark forces and creates this magnificent weapon for him. The sword might be made from some rare and magical materials that enhance Percy's abilities.
Perhaps he discovers it in an ancient, hidden temple dedicated to a forgotten god. The sword could be a gift from this god, who sees potential in Percy to use it for good.
Well, in some fanfictions, Percy might obtain the spear as a gift from a minor god who sees his potential. For example, a god of an ancient and forgotten war cult could give it to him, seeing Percy as a worthy warrior to carry on their legacy.
In some fanfictions, he might find it in an ancient weapon stash hidden in a mythical location. Maybe while on a quest, he stumbles upon a secret chamber where the katana is kept as a powerful relic from an old civilization.
Well, he might find it in some mysterious place like an ancient temple. Maybe it was left there by a powerful being from another dimension.
In some fanfictions, Percy might obtain the trident through a special quest. Maybe he has to prove himself worthy to an ancient sea deity who then bestows the trident upon him as a symbol of power and trust.
Yes, in some fanfiction, Percy Jackson can be depicted as a Frost Giant. Fanfiction allows for a lot of creative interpretations, and authors might take the existing Percy Jackson universe and twist it in unexpected ways, like making him a Frost Giant.
Well, Percy Jackson as a 'giant fanfiction' is different in that it was written by an author with a clear vision and a planned out story arc from the start. Most fanfiction is more episodic and written as a response to an existing work. Riordan created a whole new set of rules and character dynamics in the world of Percy Jackson. Also, it has been adapted into movies and other media, which is not common for typical fanfiction.
One way Percy Jackson could obtain Mjolnir in fanfiction is through a quest. Maybe the Norse and Greek gods come to an agreement for some reason. The gods set up a series of challenges that Percy must complete. These challenges could test his courage, strength, and wisdom. If he passes all of them, he is deemed worthy and is given Mjolnir as a sort of temporary loan or gift for a specific purpose, like saving both the Norse and Greek realms from a common threat.
In the fanfiction, it's possible that the boa staff is a reward for Percy helping out a magical creature. He could have saved a snake - like being that has a special bond with the boa staff. As a token of gratitude, the creature gives Percy the staff which then becomes an important part of his adventures.
In the fanfiction, Percy might face new challenges related to his demigod status. Maybe he has to deal with the aftermath of the war, like rebuilding Camp Half - Blood or helping new demigods adjust.
Well, in some fanfictions, it might be related to his demigod powers. Since he has a connection to the water element, blood being a liquid could potentially be manipulated in a way similar to how he controls water. Maybe he can sense the water content in blood and use his will to move or influence it.