Identity crisis is also common. Percy has been a demigod, and now as a god slayer, his identity is shaken. He may question who he really is and whether he's still the same Percy. In some fanfictions, he struggles with this as he sees himself changing in the mirror of his new actions and the reactions of others.
Power and responsibility. Since Percy is taking on the role of a god slayer, he has to deal with a great deal of power. And with that power comes the responsibility of not misusing it. For example, in many fanfics, he has to make tough decisions about which gods to target and why.
Another theme is the blurring of moral lines. God slaying is not something that is typically seen as 'good' in the Percy Jackson universe. So, in these fanfictions, Percy often has to grapple with whether what he's doing is right or wrong. He might find himself in situations where the traditional ideas of good and evil don't apply as clearly, like when facing a god who has done some wrong but also has a role in the balance of the universe.
One common theme is the hero's journey. Percy, as the dragon slayer, goes through a series of challenges and grows as a character. Another theme could be friendship. His friends might assist him in his dragon - slaying quests in different ways.
One common plot is Percy's struggle with the moral implications of being a God Slayer. He has to deal with the consequences of taking on such a role. Another plot could be Percy being hunted by other gods or forces because of his new status. Also, there might be a plot where Percy has to team up with unlikely allies to face the chaos that ensues after slaying a god.
One common theme is the hero's journey. Percy, as the dragon slayer, has to go through various challenges and grow as a character. Another theme is the power of friendship. Often, he has friends who help him in his dragon - slaying quests. For example, his demigod friends might use their unique powers to assist him.
One common theme is power - up. Naruto or other characters often gain new and extraordinary powers related to god - slaying. Another theme is the clash between different power systems, like the ninja chakra system and the god - slaying powers.
One of the common themes is the struggle against new enemies. When Naruto becomes a flame god slayer, he attracts the attention of powerful foes who are either after his powers or see him as a threat. Also, friendship and loyalty are themes. His friends in the Leaf Village may be initially skeptical or worried about his new powers, but they still stand by him, and Naruto has to prove that he can be trusted with such great power. This is often shown through various story arcs where Naruto has to make difficult choices to protect his friends while using his flame god slayer abilities.
Power and responsibility is a common theme. As Natsu becomes a dragon god slayer, he has more power, but also more duties. Another theme is friendship. His friends in Fairy Tail still support him even as he changes. And there's often the theme of self - improvement, as Natsu has to master his new abilities.
Power and its consequences. Since it involves a God Slayer OC, often the story explores what it means to have such great power. Whether it's using it for good or being tempted by it.
Yes, in certain Percy Jackson fanfiction. Writers like to explore different aspects of his character and powers. Since Percy has such a strong connection to the demigod world and has faced numerous challenges involving gods, it's not a huge stretch in fanfiction for him to be portrayed as a God Slayer. This can add a whole new layer of drama and adventure to the story.
Power is a common theme. The power of the god and the power of the slayer. Another is rebellion, as slaying a god is often an act of rebellion against the established order.
Another theme is the exploration of Percy's identity. Since he's interacting with these ancient and powerful beings, he starts to question who he really is. He might discover new aspects of his powers or his heritage. In some fanfictions, he could find out that he has a deeper connection to the gods than he initially thought, which leads to a journey of self - discovery.