I'm not really sure about specific popular Percy and Kronos mpreg fanfiction stories. Fanfiction can be a very niche area, and this particular combination is rather unusual. You could try searching on major fanfiction websites like Archive of Our Own (AO3) and use their search filters to look for such stories.
There may not be a lot of well - known Percy and Kronos mpreg fanfiction out there. However, if you dig deep into the Percy Jackson fanfiction community, you might find some works. Keep in mind that this concept is not mainstream in the overall fanfiction world. It might also be that due to the nature of the relationship between Percy and Kronos in the original lore, it's not a common pairing for this type of story. So, start by exploring relevant tags on fanfiction platforms.
It is often considered controversial. First of all, the mpreg genre itself is not accepted by everyone as it defies normal biological understanding. Secondly, Percy and Kronos are characters with a defined relationship in the Percy Jackson universe. Kronos is a powerful and evil force, while Percy is the one fighting against him. Putting them in a mpreg scenario completely changes the nature of their relationship and the story's expected flow. So, it's likely to be controversial among fans who have a strong attachment to the original story and its characters.
One popular Percy is Kronos fanfiction might be 'The Fall of Kronos' where Percy has an unexpected connection to Kronos. It delves into how Percy could potentially change the fate of Kronos in an alternate universe. Another could be 'Percy and Kronos: A Different Alliance' which explores a scenario where Percy and Kronos form an uneasy alliance against a common enemy, perhaps a greater evil than Kronos himself. There's also 'Kronos' Redemption through Percy' which shows how Percy might be the key to Kronos finding some form of redemption, a very different take on their relationship compared to the original stories.
Luke could also be a prominent character. Since he has a complex relationship with Kronos in the original story, in fanfiction he could play a role in either helping or hindering fem Percy's efforts against Kronos. Nico di Angelo is another possibility. His powers over the dead could be useful in a fight against Kronos, and he might team up with fem Percy for that reason.
I'm not sure if there are any extremely popular ones in the mainstream sense. Since mpreg fanfiction is a very specific and often a bit of a niche area. However, within the Percy Jackson fanfiction community, there might be some well - known ones among those who are interested in this particular genre. You would probably need to search in dedicated fanfiction websites and forums to find out.
Lemon fanfiction involves adult - like or inappropriate content in many cases. But if you're looking for regular 'Percy Jackson and Kronos' fanfiction that is well - written and follows the general lore, you could check out reviews on Goodreads or Reddit. People often discuss their favorite fan - created stories there. Just avoid any content that seems to be going in an inappropriate direction.
Annabeth is often a popular character. In fanfiction, she might play a crucial role in helping Percy deal with his complex identity as the son of Kronos. Grover could also be popular as he's Percy's loyal friend and could be there to support Percy through his struggles related to his new - found heritage.
One interesting story could be 'The Unexpected Miracle'. In this fanfiction, Percy finds himself in a situation that leads to mpreg in a very magical and unexpected way. The author does a great job of blending the elements of the Percy Jackson universe with this unique concept.
Kronos is also a popular character. His menacing presence and his complex backstory attract a lot of writers. Writers like to explore his motives for rebelling against the Olympians and what made him turn into such a villain.
In many fanfictions, Percy might use his water powers in a unique way. Maybe he combines his control over water with his sword fighting skills. He could create a giant water vortex to disorient Kronos and then strike with Riptide while Kronos is off - balance.
One possible story could be where Percy is framed for a crime he didn't commit against the son of Kronos, leading to his so - called 'betrayal'. Maybe he was set up to look like he stole an important artifact that the son of Kronos was supposed to protect.