Maybe there's a device that switches their personalities in the fanfiction. So, Kid becomes more mischievous like Kat and Kat has to deal with the responsibility that Kid usually has. This would lead to a lot of comical situations as they interact with the other characters from their respective shows.
In the fanfiction, a powerful villain could be threatening both Kid's world and Kat's world. They are forced to form an alliance. Along the way, they learn about each other's strengths and weaknesses and start to respect each other more. This could also include some epic battles against the villain and his minions.
One idea could be that Kid and Kat end up in a strange new world together and have to work together to find their way back home, despite their usual rivalry. They could encounter all sorts of wacky creatures and challenges along the way.
Maybe in the fanfiction, there could be a parallel universe where Kid and Kat have different personalities. They are forced to coop to save both their worlds from destruction. Kat could be more heroic than usual and Kid could be more hesitant, creating an interesting dynamic.
Perhaps the OC is a new kid in town who is initially scared of Kat but then discovers a hidden connection between them. Maybe they both come from the same alien origin, which changes the way they interact and fight.
Well, here's an interesting plot. There's a big storm coming to town. Kid wants to protect the town with his inventions, like building a huge umbrella - like structure. Kat, on the other hand, sees the storm as an opportunity to have some wild adventures. He starts running around, causing more damage. Kid has to stop Kat while also trying to keep the town safe. Also, a plot could be that a famous cat - trainer comes to town and wants to take Kat away. Kid has to prove that he can take better care of Kat and that Kat is better off staying with him. This leads to a series of challenges and competitions between Kid and the cat - trainer.
One plot idea could be that Kid and Fem Kat team up in the coop mode to solve a mystery in their neighborhood. Maybe there are strange disappearances of small objects, and they suspect a new villain in town. Another idea is that they have to compete in a friendly competition within the coop setting but end up learning more about each other's strengths and weaknesses.
A possible plot could be that the Reader moves into the neighborhood where Kid and Mr. Kat live. The Reader is intrigued by the strange relationship between the two. One day, Kid accidentally breaks something of Mr. Kat's while trying to show off in front of the Reader. Mr. Kat blames Kid and they start arguing. The Reader steps in and suggests they work together to fix it. As they do, they start to understand each other more and the Reader helps them build a better relationship.
First, you need to know the characters well. Watch episodes of both shows to understand Kid's and Kat's personalities, their goals, and their relationships with other characters. Then, think of a unique situation that would bring them together, like a magical portal or a shared mission.
In a world where Kid and Kat co - exist, Kid noticed that Kat had been acting strangely lately. Kat seemed to be spending a lot of time in the old abandoned house on the edge of town. Kid, being the curious boy he is, decided to investigate. He snuck into the house one day only to find that Kat was building a giant cat - like contraption. Kid realized that Kat planned to use this to take over the town's supply of tuna. So, Kid quickly ran back home and started to build his own device to counter Kat's plan. After days of hard work, Kid was ready. He confronted Kat just as Kat was about to launch his contraption. A battle ensued, with Kid using his smarts and Kat using his feline agility.
Once upon a time, the reader was walking in the neighborhood when they stumbled upon Mr Kat. Mr Kat was up to his usual antics, plotting against Kid. The reader, being a kind - hearted soul, decided to intervene. They tried to reason with Mr Kat, explaining that Kid was just a kid having fun. Mr Kat scoffed at first, but as the reader continued to talk, he started to listen. In the end, Mr Kat and the reader formed an unlikely friendship, and Mr Kat decided to give Kid a break.
Well, perhaps there are stories where the kid and the kat team up unexpectedly. For example, they might face a common enemy like a mean neighbor's dog. In the 'kid vs kat doodle'z stories', this could lead to some really fun and unexpected adventures as they put aside their differences to deal with the dog.
One common theme could be friendship. Despite the 'vs' in 'kid vs kat', when the 'coop' and 'female kat' are involved, it might show how they can work together and form friendships.