A big blooper could be in the dialogue. Sometimes, the characters in fanfics might use modern slang that doesn't match the semi - ancient/mythological setting of the Percy Jackson universe. Like a character saying 'lit' or 'on fleek' which would seem out of place. Also, inaccurate descriptions of the Camp Half - Blood layout or the functions of certain magical items can be considered bloopers.
One common blooper could be inconsistent character personalities. For example, in some fanfics, Annabeth might be written as overly emotional, which goes against her canon composed and intelligent self. Another could be incorrect use of Greek mythology elements. Maybe the author mixes up the powers or stories of different gods.
Well, one interesting moment could be when the characters break character and start joking around in a really goofy way. For example, Percy might accidentally say a modern-day slang that doesn't fit the mythological setting, which would be hilarious in the context of a blooper.
Bloopers can disrupt the flow of the story. If there are sudden changes in a character's behavior or abilities that don't make sense, it can confuse the reader and make it hard to stay immersed in the fanfic.
I'm not sure about the most popular ones specifically, but you can start by looking on fanfiction websites like Archive of Our Own. Just search for 'Percy Jackson bloopers' and you'll likely find a bunch of different stories. Some might focus on the characters messing up during training sessions, like Percy accidentally hitting Chiron with his sword instead of the practice dummy.
Well, in 'pokemon bloopers fanfic', there might be stories where pokemon do things out of character. For example, a Pikachu that forgets how to use Thunderbolt and instead tries to use Water Gun. It's really funny to see the pokemon in these unexpected situations.
In a fanfic, perhaps Percy and his friends accidentally stumble upon Medusa's lair while on a quest. But instead of immediately attacking, Medusa offers them a deal. She says she will give them a valuable clue to complete their quest if they help her get revenge on one of the minor gods who wronged her in the past. Percy and his friends then have to decide whether to trust Medusa or not.
One idea could be a fanfic where Sally tells Percy stories about his father from her own perspective before he knew the truth. It would give a deeper look into their relationship and how Sally coped with the knowledge of Poseidon.
There could be bloopers regarding the courtroom scenes. Maybe the attorneys make some really dumb mistakes that they wouldn't in the original game. Like presenting the wrong evidence at a crucial moment and then having a comical reaction from everyone in the courtroom.
One interesting plot is Percy being summoned by a time - traveling device. He is brought to a future where the Greek gods are forgotten and the world is in chaos due to the lack of their influence. Percy has to find a way to bring back the knowledge of the gods and restore order, all while dealing with the strange new technology and a society that has lost its moral compass.
One interesting fanfic could be where Percy and Annabeth get transported to a modern city with no knowledge of the demigod world. They have to figure out how to survive and also rediscover their powers. It's a fun twist on their usual adventures.
Well, one interesting plotline could be Percy's encounter with a magical watch that has the power to stop time. He might use it to outwit his enemies during a battle, like when facing the minotaurs. Another could be the watch being a key to an ancient prophecy that only Percy can unlock, leading him on a new adventure.