There are several common themes. For instance, the theme of healing is often seen. Given Will's role as a healer in the Percy Jackson world, he might help Percy heal from physical or emotional wounds in the TLT - based fanfictions. Another theme is the exploration of the Greek mythology elements that are so central to the series. Percy and Will might interact with different Greek gods or creatures in unique ways. And of course, the theme of young love or the start of a romantic relationship between them can be a major focus, as fans like to explore how their relationship could develop in the TLT setting.
One great place to find Percy x Will TLT fanfiction is Archive of Our Own (AO3). There are numerous stories there. You can search for tags like 'Percy Jackson', 'Will Solace', and 'The Lightning Thief (TLT)' to narrow down the results. Some popular fics might have interesting takes on their relationship, like how they team up during quests in the Percy Jackson universe.
One plot idea could be that Percy and Will have to go on a quest together in the world of TLT. Along the way, they face various challenges that test their friendship and skills. For example, they might encounter a powerful monster that they have to defeat using their combined powers. Another idea is that they find a mysterious place in the TLT realm that has some sort of healing power, which is of great interest to Will as a healer. They then have to protect this place from those who would misuse it.
To develop Percy's character well, emphasize his courage and loyalty. Show how his experiences in previous adventures have shaped him. For example, his time at Camp Half - Blood has made him a natural leader. For Will, focus on his caring nature as a healer. Let his actions towards Percy, like always being there to patch him up, show his kindness. Also, give them both flaws. Percy could be a bit impulsive at times, and Will could be overly cautious in some situations.
Another theme could be adventure. They might go on quests together, using their respective powers. Percy with his water - related abilities and Apollo with his archery and prophetic powers. It makes for exciting storylines where they face various mythological creatures and challenges.
One common theme is adventure. Given that both characters might be from action - filled universes, they often go on adventures together in fanfictions. For example, they could be on a quest to save their world or a particular place within it.
Friendship is a very common theme. These three characters are often depicted as having a strong bond that helps them through various difficulties. For example, in many fics, they rely on each other during battles or when facing internal demons.
The exploration of different mythologies is also a theme. Castiel is associated with Christian angel mythology, while Percy is part of Greek mythology. Fanfiction might delve into how these two mythologies interact or clash when the two characters meet. It could be about how they view each other's deities or how the rules of their respective mythologies affect their relationship.
One common theme is the struggle with identity. Since the child has two very different parents, they often have to figure out where they belong. Another theme is the power struggle. With powers from both Percy and Artemis, they might face challenges in controlling or using them properly. And family acceptance is also a big one. How will Percy's friends and family, as well as Artemis's followers, accept this child that goes against the norms of their worlds?
One common theme is the idea of Percy overcoming his blindness in unique ways, often with the help of Artemis. For example, his connection with water might be enhanced in some stories, allowing him to'see' through the movement of water around him. Another theme is the relationship between a mortal (even a special one like Percy) and an immortal goddess like Artemis. It creates a lot of interesting power dynamics and emotional conflicts.
A lot of fanfictions also focus on the relationship between the two in a more emotional sense. Maybe Percy is lost and in need of guidance, and Rhea steps in as a mother - like figure. Or perhaps there's a more romantic undertone, which is a bit of a stretch given their different natures but makes for interesting stories.