One popular theme is the exploration of the Kwamis' personalities. For example, Tikki's positive and guiding nature can be delved into more deeply. Another theme is the relationship between the Kwamis and their holders. How they interact, communicate, and support each other during battles and in daily life. Also, some fanfictions focus on the origin of the Kwamis, creating backstories that are not fully explored in the original series. This could include where they came from before they were associated with the Miraculous jewels and how they came to be part of the whole Miraculous system.
One common theme is friendship. The Bee Kwami often forms strong bonds with other characters, whether it's Ladybug, Cat Noir or other Kwamis. It shows how these friendships help in facing challenges in the Miraculous world.
Maybe the Wolf Kwami has a special power that is different from the other Kwamis. A new villain wants to steal this power for their own evil plans. The story could focus on Ladybug and Chat Noir protecting the Wolf Kwami and its power. This would involve a lot of action and adventure scenes.
Let's make a Kwami named Luma. Luma could be a Kwami related to stardust. Its Miraculous could be a star - shaped hairpin. The superhero with this Miraculous would be able to fly faster than normal superheroes, and also have the ability to create a shield made of stardust that can protect from most attacks.
Well, this kind of fanfiction could start with Marinette making a mistake while using the Miraculous. Then she finds herself in the form of a Kwami. She might be really tiny and have to find ways to get around. She could hitch rides on people's shoulders or use her small size to her advantage when it comes to spying on Hawk Moth. And she would definitely have to deal with the fact that she can't just transform back into her normal self right away, leading to all sorts of comical and tense situations.
One interesting idea could be the different powers and personalities that come to the fore when the kwamis switch. For example, if Tikki and Plagg switched, Ladybug might become more mischievous and Cat Noir more rule - abiding in a very different way. It could also lead to new dynamics in the battles against villains as the heroes have to adapt to their new powers and instincts.
Another way is to have the Kwami OC interact with the existing Kwamis in the Miraculous Ladybug universe. If your Kwami OC is Ember, which has the power of fire, it could meet Tikki and Plagg. They could have a conversation about how their powers are different yet related. This kind of interaction can add depth to your fanfiction.
One possibility could be that humans with Kwami would have extraordinary powers similar to the Miraculous holders. They might use these powers for both good and bad, creating a whole new dynamic in the Miraculous Ladybug universe. For example, a human with the Kwami of creativity could come up with amazing solutions to problems, but also be tempted to use it for personal gain at the expense of others.
Definitely Ladybug and Chat Noir. They are the central characters, and a Kwami swap for them means a whole new set of challenges and adventures. For example, how they interact with each other when they have different powers and how they adapt to the changes. Also, Rena Rouge could be an interesting character to focus on in Kwami swap fanfiction. Maybe she gets involved in helping the heroes deal with the consequences of the swap, or perhaps her own Kwami gets swapped in some way, adding another layer of complexity to the story.
One popular theme is the reveal of the identities of Ladybug and Chat Noir. Fans love to explore how their relationship would change once they know who each other really is.
In a Kwami swap fanfiction, a possible plot is that the swapped powers start to have unforeseen side effects on the holders' daily lives. Ladybug, for instance, might find it difficult to balance her normal life with the new Kwami - influenced powers. Chat Noir could be in a similar situation. As they struggle to deal with these changes, they also have to figure out how to reverse the Kwami swap. Meanwhile, the city is in more danger than ever as they are not at their full potential, and this could lead to some intense and exciting battles and rescue scenes.