One great 'Percy Jackson Monster Fanfiction' is 'The Monster's Perspective'. It offers a unique take on how the monsters in the Percy Jackson world view the demigods. It's really interesting to see their side of the story.
Another theme is the relationship between demigods and monsters. Some fanfictions explore how they can co - exist or even form unlikely alliances. This goes against the typical view in the original series where they are mostly enemies. It shows that there could be more complexity to their interactions, like a monster helping Percy in exchange for something it wants.
One idea could be that the new girl is a demigod from a very rare and powerful lineage. For example, she could be a descendant of a primordial god that no one has seen in centuries. This would bring a whole new dynamic to Camp Half - Blood as everyone tries to figure out her powers and where she fits in.
The theme of heritage often shows up. Percy's demigod heritage plays a role in how he approaches monster hunting. Sometimes, the fanfictions explore how his Greek god - related abilities give him an edge or create unique challenges when dealing with different types of monsters. And there's also the theme of redemption in some cases, where a monster or a hunter might be seeking redemption for past actions.
You can find 'Percy Jackson Monster Fanfiction' on fanfiction.net. It has a large collection of stories related to the Percy Jackson series, including many that focus on the monsters. Just use the search bar and type in relevant keywords like 'Percy Jackson' and'monster' to find what you're looking for.
I think Cerberus could be an interesting one. It guards the Underworld, and taming it would involve not only dealing with its three heads but also its loyalty to Hades. Percy would have to find a way to convince Cerberus that he's not a threat and that it should follow his commands. It would also open up some cool storylines about exploring the Underworld with a tamed Cerberus by his side.
There's a character in some fanfictions called Nova. She's a really interesting girl character. Nova is a daughter of Hecate, and she has powerful magic abilities. She often uses her magic to get the demigods out of tricky situations. Then there's Eira, a daughter of Poseidon in some fanfictions. She has the ability to control water in a unique way, different from Percy. She's strong - willed and is not afraid to stand up for what she believes in. Also, many fanfictions feature a girl named Thalia, who is already a well - known character from the original series but is often given more depth and new storylines in fanfiction.
She could be the daughter of a minor god that hasn't been introduced much in the original Percy Jackson series. For instance, the daughter of Hecate. This would give her powers related to magic, which would be really cool in the context of the story. She could use her magic to help Percy and his friends in battles or to solve some of the mysteries they encounter.
One idea could be a story where Percy has to team up with a monster that has been wrongly accused. Maybe a centaur is framed for stealing a powerful artifact from Camp Half - Blood. Percy, being the hero he is, decides to help the centaur clear its name and in the process discovers a new threat to the demigod world that involves an ancient monster alliance.
One great Percy Jackson a monster fanfiction is 'The Monster's Redemption'. It tells a story about a misunderstood monster who teams up with Percy. The character development in it is really interesting.