In a Percy Jackson fanfic with a sick Octavian, one possibility is that the sickness is some sort of magical or divine affliction. This could tie into the overall mythology of the series. For example, it could be a curse from an angry god because of something Octavian did. His struggle with the sickness could then be a journey of self - discovery and redemption. He might start to see the error of his ways, especially if he has to face his mortality. And this could have a ripple effect on the relationships between the demigods of the Greek and Roman camps.
Perhaps Octavian's sickness is a way for the author to explore themes of forgiveness and acceptance. He could be a really unlikable character at first, but as he gets sick, he starts to change. The other characters see this change and start to question their own prejudices against him. His sickness could be a catalyst for him to make amends with those he has wronged in the past. And the story could end with him either fully recovered and a changed person, or with his death being a turning point for the other characters to become better.
Well, it's hard to name just one. There are many talented authors out there. One author who stands out is someone who goes by the username 'DemigodWriter99'. Their fanfictions about Octavian and Percy often have unique plot twists and really in - depth characterizations. They manage to make Octavian more than just the 'bad guy' we see in the original series.
One great 'Octavian Percy Jackson' fanfiction could be the one where Octavian has a change of heart towards Percy. It shows a different side of Octavian, exploring his character in depth. In this story, he realizes that Percy is not the enemy he thought he was and they end up working together in an unexpected way.
In fanfiction, the relationship between Percy Jackson, Octavian and Rachel can be quite complex. Percy and Rachel have a connection, as Rachel has the gift of prophecy and is also someone Percy has feelings for at some point. Octavian, on the other hand, is often portrayed as an antagonist. He may be in conflict with Percy due to their different views on the Roman and Greek demigod worlds. Rachel might be caught in the middle, or she could be used as a tool by Octavian in some stories to get to Percy. However, it really depends on the specific fanfiction and the creativity of the author.
These fanfics can have a significant impact. They add new dimensions to the characters. For Percy, being sick shows his vulnerability, which is not always explored in the original books. It makes him more relatable to fans who have also experienced illness. Fans can then engage more deeply with the character.
In some Percy Jackson sick fanfics, the author might take a different approach. Instead of a physical illness, Percy could be affected by a mental or emotional 'sickness'. For example, he could be suffering from a curse that makes him lose his confidence or his sense of self. This would change his character dynamics as he would no longer be the fearless hero we know. His friends would have to find a way to break the curse and bring back the real Percy.
One interesting 'octavian percy fanfic' could be about their epic battles in an alternate universe. Maybe in this fanfic, they have to team up against a greater evil despite their differences. It could show how they gradually learn to respect each other's powers and abilities.
One common plotline is the love triangle between Percy, Rachel and Octavian. Octavian might try to win Rachel over to get to Percy or to spite him. Another plotline could be that Octavian frames Percy for something, and Rachel has to use her powers to prove Percy's innocence. Also, they might all be on a quest together, where Octavian's distrust of Percy and Rachel's unique abilities create a lot of tension within the group.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find some great 'octavian percy fanfic' there.