The plot might start with the hurt reader running away from home after an argument with their family. They end up in a magical garden where Tikki and Plagg are. Tikki offers the reader some magical treats that have the power to heal emotional wounds. Plagg, meanwhile, teaches the reader how to be more carefree. The reader then has a series of adventures with the kwamis, learning important life lessons along the way and eventually mending their relationship with their family.
It could be Hawk Moth. Since he's always after the Miraculouses, he might sense the presence of Tikki and Plagg with the hurt reader and try to manipulate the situation to get the Miraculouses. He could use the reader's vulnerability against them, trying to convince the reader that giving him the Miraculouses would solve all their problems.
Well, it could be that Marinette accidentally discovers Plagg while looking for something in Adrien's room. Plagg might initially be wary but then realizes Marinette's kind heart. They could team up to play a prank on Chat Noir.
One adventure could be that they accidentally get separated from their holders and have to find their way back. Tikki might use her ability to sense positive emotions to lead the way, while Plagg complains the whole time about being hungry. Along the way, they encounter other kwamis who either help or hinder them.
Well, they could get into all sorts of mischief. Maybe they decide to play a prank on their holders. Tikki could use her positive energy to create an illusion of a delicious macaron that Plagg can't resist, but when he tries to eat it, it disappears. And then Plagg could use his Cataclysm to create little harmless 'disasters' like making a small pile of papers look like they've been completely destroyed, just to make Tikki gasp in surprise.
One popular theme is the relationship between Tikki and Plagg. They are polar opposites, Tikki being the kwami of creation and Plagg of destruction, and exploring how they interact in different situations can be really interesting. Another theme could be the adventures they have with their holders. For example, when their holders face tough villains, how Tikki and Plagg guide and assist them. Also, stories about their origin and the history of the Miraculous they are associated with are quite popular in fanfiction.
When Plagg meets Marinette, it could be a significant moment for character development. Marinette could learn more about the kwamis from Plagg, which would give her a different perspective on the Miraculous she holds. Plagg might also start to see Marinette as more than just Adrien's friend. He could realize that she has her own strength and determination. This encounter could potentially change the dynamics between them and even affect how they interact with each other in future events related to the Miraculous.
In this fanfiction, Gabriel might be shocked to meet Plagg. Maybe he tries to take Plagg's power for his own purposes, like using it to enhance his control over the Miraculous.
One idea could be that Tikki and Plagg get accidentally switched with two other kwamis for a day. This would lead to chaos as Ladybug and Chat Noir have to deal with the different powers and personalities of the new kwamis. Another plot could be that Tikki and Plagg discover an ancient secret about their origin that could change the way they view their roles as kwamis. Maybe they find out they were created for a purpose other than just powering the Miraculous.
Well, Tikki and Plagg are kwamis in the Miraculous Ladybug universe. Their love story is rather unique. They have a very old relationship. They bicker a lot like an old married couple. But beneath all that, there's a deep connection. They are two sides of the same coin in a way, with Tikki representing creation and Plagg representing destruction. Their love is shown through their understanding of each other despite their differences. They have been together for a very long time and have a bond that is hard to break.
In the 'tikki meets nooroo fanfiction', they might share their experiences as kwamis. Tikki could talk about her time with Marinette, and Nooroo might open up about his time with Hawkmoth. They could also discuss how different their holders are in terms of their personalities and goals.