A common and interesting plot twist in Miraculous Ladybug Loveater fanfictions is when the love between Ladybug and Chat Noir is somehow magically reversed or blocked. This creates a lot of tension as they struggle to work together without their usual connection. Additionally, there could be a plot twist where the akuma affects not just Paris but the whole world, forcing Ladybug and Chat Noir to seek help from other Miraculous holders in a much larger scale operation.
One popular plot twist could be a revelation about the true identity of Hawkmoth. In many fanfictions, this can completely change the dynamic of the story. Another might be a sudden shift in the relationship between Ladybug and Chat Noir, like a misunderstanding that drives them apart when Loveater is involved. Maybe Ladybug is forced to make a difficult choice regarding her love life or her duties as a superhero.
One common plot twist is the revelation of a character's true identity in a different way than in the original show. For example, a side character might turn out to be a Miraculous holder secretly. Another is when the love square between Marinette, Adrien, Ladybug, and Chat Noir gets a new dynamic. Maybe they find out about each other's identities earlier than expected, which completely changes their relationship and how they interact with each other in the story. And sometimes, new villains are introduced that have a connection to the main characters' pasts, which throws a wrench in their plans to protect Paris.
Well, sometimes in fanfiction, a plot twist is that Ladybug turns out to have a hidden power that is related to being unmasked. For example, she might be able to create an illusion of her unmasked self to deceive the villains. And in some stories, Chat Noir is unmasked first and it causes a huge rift in his relationship with Ladybug because she feels he was careless. This then leads to a whole new set of challenges for them to overcome.
Writers often portray the characters in unique ways in Loveater fanfictions. Marinette, as Ladybug, could be more emotional. The stress of dealing with Loveater might make her more likely to let her feelings for Adrien (Chat Noir) show in ways she normally wouldn't. Chat Noir, on the other hand, could be portrayed as more brooding. He might be more focused on the mystery behind the akuma and less on his usual flirty self.
One interesting plot twist could be that Ladybug, while in a fight, is magically transported to the Mulan universe. There, she has to learn Mulan's way of fighting to get back home. Maybe she teams up with Mulan herself against a common enemy like an akumatized Shan Yu.
One plot twist could be that Hawk Moth teams up with Jafar. They both have their own evil plans, and together they become a more powerful force. Ladybug and Cat Noir then have to rely on Aladdin and Jasmine's knowledge of Agrabah to find a way to defeat them. Another twist could be that the Miraculous jewels are actually ancient artifacts from Agrabah that were lost long ago, and Aladdin accidentally stumbles upon one, which draws Ladybug and Cat Noir to his world.
An interesting twist could be that the hypnosis isn't just a simple mind - control. Instead, it's a form of time - travel hypnosis. The characters are hypnotized and sent back in time to when Hawk Moth first got his powers. They then have to figure out a way to stop him from getting the powers in the first place, all while dealing with the disorientation of being in a different time period and the limitations of their Miraculous in the past.
Hawk Moth is another character that shows up a lot in fanfiction. Writers like to explore his motives more deeply, or come up with scenarios where he has a change of heart or forms an unexpected alliance. His complex character makes him an interesting subject for fanfiction writers to play around with.
Aside from Ladybug and Chat Noir, Hawk Moth is quite popular in fanfiction. He is the main villain, and many fanfiction writers like to explore his backstory and motives further. There are also some side characters like Alya, Marinette's best friend, who is popular as she often gets involved in the superhero adventures in an indirect way. And of course, Adrien, who is Chat Noir, is a fan favorite due to his charming personality both as a superhero and as a civilian.
I think 'Ladybug's True Love' is quite popular. It has a lot of readers because it portrays Ladybug and Chat Noir's love in a very sweet and innocent way. The story progresses at a good pace and has some really endearing moments between the two characters.
Marinette is also very popular. Fanfiction often delves into her life as a normal girl, her struggles with school, her crushes, and how she balances being Marinette with being Ladybug. Her clumsy but endearing personality gives a lot of room for interesting storylines.