Well, you could write a fanfic that focuses on the backstories of the characters in 'Blood of Olympus'. Maybe explore how Percy Jackson became the hero he is from a different perspective. Or create a plot where the gods interfere more directly in the demigods' quests in the fanfic. This could add more drama and tension as the demigods have to deal with the gods' complex personalities and motives on top of their existing challenges.
One idea could be a new prophecy that involves the demigods having to travel to an unknown realm to retrieve a powerful artifact before the Titans use it to destroy the world. Another could be a fanfic where the demigods form an alliance with some previously thought - of - as - enemies, like certain monsters who also don't want total chaos. Or perhaps a story where a demigod discovers a hidden power within themselves that has the potential to change the balance of power between the gods and the Titans.
Well, you could write a fanfiction where a minor character from the original 'Percy Jackson and the Blood of Olympus' gets their own story arc. Maybe a character who was always in the background but had a lot of potential. For instance, a demigod who discovers a new power related to the blood of Olympus that was previously unknown. They could then go on a journey to master this power and in the process, uncover secrets about the Olympians that were long forgotten.
One idea could be exploring the relationships between the demigods in more depth. For example, how Percy and Annabeth's relationship evolves after the events of 'Blood of Olympus'. Another could be creating a new adventure for the demigods that involves a forgotten prophecy. Maybe they have to travel to a new, unknown part of the mythological world to fulfill it.
One idea could be Percy having to deal with a new, powerful enemy that even the Olympians are afraid of. He has to use his unique skills and form new alliances.
One idea could be Percy going on a quest to find a lost artifact that has the power to restore a dying part of the godly realm. This would involve him facing new monsters and making unexpected alliances.
A really interesting Lore Olympus fanfic idea could be a crossover with another mythological universe. For instance, combine it with Norse mythology and see how the Greek and Norse gods interact. You could also write a fanfic that dives deep into the relationship between Demeter and Persephone before the events of the main story, exploring their mother - daughter bond and the things that led to their initial conflicts.
Perhaps a fanfic where Naruto's blood has some special connection to an ancient and powerful demon. The demon is slowly being awakened due to some dark magic related to Naruto's blood. Naruto has to face not only the threat of the demon but also the distrust from some in the village who think his blood is a danger. He must prove that he can control this situation and keep the village safe.
Another plot could focus on the origin stories of some of the side characters. For instance, the backstory of Yukina Himeragi. How did she become an attack mage? What kind of training did she go through? A fanfic could expand on this and also show how her past experiences influence her actions and relationships in the present story.
One idea could be exploring the backstories of the characters more deeply. Maybe delving into their childhoods and how those experiences shaped them into the people they are in the story. Another could be creating an alternate universe where the main characters have different occupations or abilities.
Well, you could write a fanfiction where the power dynamics in Olympus are completely different. Maybe the mortals have more power over the gods for a change. Or you could write about a character's journey to find their true self outside of their given role in Lore Olympus. For instance, a character who is always seen as a villain trying to prove they can be good. Also, a time - travel based fanfiction where a character goes back in time to change a crucial event in Lore Olympus history would be really interesting.