Flynn from Shake It Up and Ernie from KC Undercover could have a hilarious interaction. Flynn is often the comical sidekick in Shake It Up, and Ernie has his own brand of humor in KC Undercover. They could get into all sorts of wacky situations together, like accidentally triggering a spy gadget while trying to help with a dance routine, or getting lost in a maze - like dance studio while looking for a missing piece of spy equipment.
Maybe in the fanfiction, there's a mix - up at a summer camp. The characters from Shake It Up think they're at a dance - focused camp, and KC and her undercover team think they're at a spy - training camp. As they start to realize the mistake, they also find out that there's a common threat - a group that wants to shut down the camp. So they combine their skills, the Shake It Up gang with their dancing and creativity, and KC's group with their spy skills, to save the camp.
I think CeCe from 'shake it up' would be really interesting. She has such a bubbly and determined personality. In the fanfiction, she could be the one who tries to bridge the gap between the two groups, using her charm and dance skills.
Robin from Young Justice and Agent A would likely have an interesting interaction. Robin is highly intelligent and a great detective in his own right. Meeting Agent A, who may have different methods of investigation, could lead to some really cool exchanges. They could compare notes on cases and share their insights on solving mysteries.
One common theme is friendship. Characters from both shows might form new friendships or have to work together as friends in some sort of adventure.
Maybe the characters from 'shake it up' and 'kc undercoover' could meet at a big dance competition. They start off as rivals but then realize they can learn from each other's dance styles and end up becoming friends.
Vision could also have an interesting interaction with Bucky. Vision is an android with a unique perspective on life and morality. He might be curious about Bucky's past as the Winter Soldier and how he is dealing with his regained humanity. Their conversations could be really thought - provoking, exploring themes like what it means to be human and how to atone for past wrongs.
Agent O'Connor from 'kc undercover' is an important character. In a crossover, perhaps a character like James Bond could be included. Bond's suave and sophisticated spy style would be an interesting contrast to Agent O'Connor's more down - to - earth approach. And if it's a crossover with a post - apocalyptic show, a tough survivor character could add a new dimension to the story, as they all have to work together to face new threats.
Sakura and Deidara. Deidara is an artist with a very unique view of the world. Sakura might be intrigued by his art while at the same time being repelled by his violent and destructive tendencies. Their conversations could be a mix of philosophical debates about art and power, and physical confrontations as they are on opposite sides.
Well, Archive of Our Own (AO3) is also a great source. It has a wide range of fanfictions, including crossovers. You might have to dig a bit through the tags related to both shows to find the perfect 'shake it up and kc undercover crossover' fanfic. Some of the crossovers might involve the characters from both shows interacting in really unique situations, like attending a combined dance and spy event.
Iron Man and Star - Lord would be really interesting. Iron Man with his high - tech gadgets and sarcastic humor, and Star - Lord with his love for music and his own brand of cocky charm. They could either be constantly trying to one - up each other or end up being great friends who learn from each other's technology and combat styles.