A really interesting plot idea could be that the blessing by the Styx actually attracts unwanted attention from the gods. Some gods might be jealous of Percy's new - found power and try to undermine him. He then has to navigate the tricky politics among the gods while also dealing with his own new abilities. Maybe there's a prophecy that's related to his Styx - blessed state and he has to fulfill it, but there are many obstacles in his way, both from the mortal and divine realms.
A plot could involve Percy's friends being in danger and the only way to save them is by making a deal with the entities in the Styx. He might have to sacrifice something precious, like a part of his powers, in order to gain their help. This would create a great internal conflict for Percy as he weighs the cost of saving his friends against his own abilities.
Well, without reading the actual 'percy blessed by the styx fanfiction', it's hard to say exactly. But generally, in many fictional universes, being blessed by the Styx is a big deal. It could mean that Percy is now supernaturally bound to a certain fate or has new abilities. For example, in some mythologies, those blessed by the Styx become invincible in certain ways. Maybe in this fanfiction, Percy has to face some great challenges with his new - found status, or he might be dealing with the consequences of this blessing, like how it affects his relationships with other characters.
Well, a plot could involve Percy being lured into Lady Styx's domain by a false prophecy. Once there, he finds out that Lady Styx has a plan to flood the mortal world with the waters of the Styx, which would bring death and destruction. Percy has to find a way to stop her, maybe by finding an ancient artifact hidden in the Underworld that has the power to control the Styx. Along the way, he meets some strange and dangerous creatures that are loyal to Lady Styx.
Well, perhaps Percy in the fanfiction is faced with a moral dilemma related to his role as Champion of Styx. For example, he might be asked to make a sacrifice that goes against his principles but is necessary to save the world. Or he could be dealing with the jealousy and suspicion of his friends who don't fully understand his new powers and status. This could lead to some really interesting character development and story arcs.
Perhaps in the fanfiction, Percy's dip in the Styx could be interrupted by an unexpected enemy. This could lead to him having to fight while in a vulnerable state, and his friends having to come to his rescue. It could add a whole new level of danger and excitement to the story.
Perhaps a plot where Lady Styx reveals some long - hidden secrets about Percy's past or his family. This could lead to Percy going on a journey of self - discovery while also dealing with the implications of these secrets in the world of demigods.
Percy becomes more confident. The blessing gives him a sense of invincibility, which at first might make him a bit overconfident, but as he faces challenges, he learns to temper it. He also becomes more in - touch with his darker side. Since the Styx is related to the underworld, he has to come to terms with the more shadowy parts of his nature.
A really wild plot twist could be that the blessing is actually a ruse by Tartarus to use Percy as a pawn in a bigger scheme against the gods. Percy, being the hero he is, would have to figure out what Tartarus is up to and find a way to turn the situation around. This would involve him having to face some really tough challenges and make some difficult decisions.
One idea could be that Percy is paralyzed during a battle with a new and powerful monster. His friends then have to find a way to heal him while also protecting him from further attacks. Maybe they seek the help of a god who is known for healing but has a difficult task for them in return.
A plot might involve Percy being experimented on by a rogue group of demigods or even a minor god. As a result, he becomes emotionless. His lack of emotions could lead to some really strange situations. For instance, he doesn't show any joy when reuniting with his mother or any sadness when his friends are in danger. His friends initially think he's been replaced by an impostor. But as they figure out what happened, they have to find a way to reverse the experiment. This could involve going on a quest to find a rare ingredient or artifact that can restore his emotions.