A plotline could also involve Percy using his color blindness as an advantage in some unexpected way. For instance, in a situation where everyone is distracted by a vividly colored illusion, Percy's color blindness might make him immune to the distraction and allow him to see through the trick. This could then set him on a path to solve a mystery or defeat an enemy in a unique way that only his color - blind perspective can offer.
One possible plotline could be Percy struggling to adapt to his color blindness in a world where color is important. For example, in a magical setting, colors might be associated with different powers or elements, and his color blindness could be a hindrance that he has to overcome.
Maybe the fanfiction could focus on how Percy's friends and family react to his color blindness. Some might be overly protective, while others might not fully understand the implications at first. This could lead to some interesting relationship - building and conflict - resolution storylines within the fanfiction.
A plotline might involve a werewolf character with blind faith in their pack's traditions. But when a new threat emerges that the traditional ways can't handle, they have to decide whether to stick with their blind faith or adapt. In the context of 'Twilight', there could also be a plot where a character has blind faith in the idea of a 'true love' that crosses the boundaries between species, like a vampire - human relationship, and they go to great lengths to pursue it, facing many obstacles along the way.
I'm not sure about specific 'percy is color blind fanfiction' off the top of my head. You could try searching on fanfiction platforms like Archive of Our Own or FanFiction.net. They usually have a wide variety of fanfictions and you might be able to find some related to Percy being color blind by using relevant keywords in their search bars.
One possible plotline could be Percy's journey of learning to adapt to his blindness. For example, he might discover unique ways to sense his surroundings, like using his other senses more acutely. Another could be how his friends and family support him through his challenges. Maybe his friends help him navigate the world around them, or his family gets him special training to help him be more independent.
One possible theme could be acceptance. The girl has to accept her color blindness and find ways to live with it.
One possible plotline could be that Naruto has been hiding his blindness all along to protect his friends. He might have developed special techniques to compensate for his lack of sight, like relying more on his other senses such as smell and hearing. For example, he could use his sense of smell to detect enemies' movements and positions, similar to how he uses it to find Sasuke in the original series. Another idea is that his blindness is a result of some hidden power or curse, and as the story unfolds, he has to find a way to either overcome it or use it to his advantage.
One possible plotline could be that an enemy tries to seduce Percy to turn him against his friends. This would create a lot of internal conflict for Percy as he has to fight against the charm or allure of the seducer while staying true to his comrades.
One possible plotline could be that Percy has been kidnapped by some mysterious enemy. Maybe it's a new villain who has a vendetta against him. His friends then start a search mission to find him, facing various challenges along the way.
One possible plotline could be Percy going through some sort of extraordinary adventure that changes Artemis's view of him. Maybe he saves her in a way that no one else could, and this new - found respect and connection gradually turns into love, leading to their marriage.
Another plotline could be that they are babysitting a group of demigod toddlers at Camp Half - Blood. The toddlers keep getting into mischief, like stealing nectar and ambrosia. Percy and Annabeth have to keep them in line, teach them about the rules, and also make sure they don't accidentally harm themselves with their budding powers. It could be a really cute and chaotic story.
One possible plotline could be Loki using Percy for his own mischievous ends. Maybe Loki wants to cause chaos in Percy's world, so he takes control of Percy and makes him do things that disrupt the normal order, like causing trouble at Camp Half - Blood.