A possible plotline could be Percy being assigned to a top - secret mission by Shield. He has to use his unique skills to infiltrate an enemy organization. Another plotline might be that Percy discovers a conspiracy within Shield itself and has to decide who to trust while trying to expose it.
One possible plotline could be that the shield girl is part of a rebellion against an evil tyrant. Her shield is a symbol of hope for the oppressed people, and she uses it to fight in battles and protect the innocent. Another plotline might be that she is on a journey to find the origin of her shield, which leads her to discover a long - lost civilization.
Maybe Shield has a new weapon that they are testing and Loki becomes an unintended target. This weapon could be something that disrupts his magic, causing him internal pain as his powers are connected to his very being. They might not fully understand the extent of the harm they are causing at first, but as Loki starts to show signs of distress, they have to decide whether to continue or stop.
One possible plotline could be that Shield has been corrupted in this fanfiction. Maybe they see Percy as a threat to their new order or some secret project. They might use his demigod powers against him, perhaps by using some high - tech device that messes with his connection to the gods. This could lead to Percy being physically and mentally tortured as he tries to resist and figure out a way to break free.
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.
Perhaps Medusa has some crucial information that Percy needs to save the world, and in order to get that information, he has to protect her from other threats. So he embarks on a journey to keep her safe.
One possible plotline could be the shock and chaos that ensues within the demigod world when they find out about Hera being pregnant with Percy's child. There would likely be a lot of disbelief and political unrest as Hera is a goddess and Percy is a demigod.