Well, perhaps she gets the power of invisibility. At first, she uses it for fun, like sneaking into places she couldn't before. But then she realizes that there's a villain who is also invisible and she has to use her new power to track him down. This could lead to a whole new set of adventures where she has to rely on more than just her physical combat abilities. She might have to use her wits in a different way to outsmart an enemy she can't see.
A new character could be introduced as the main antagonist. Maybe a powerful alien who sees Kim's new powers as a threat to his plan of taking over the earth. This alien could have his own set of powers that are quite different from Kim's, like the ability to control minds. Kim would have to not only learn to use her new powers but also find a way to defeat an enemy with such a dangerous ability.
Maybe Star and Kim find themselves in each other's worlds by accident. Star, being in Kim's world, has to figure out how to use her magic without causing too much of a stir while Kim, in Star's world, has to adapt to the magic - filled environment. They then join forces to find a way back to their respective homes and along the way, they learn from each other's skills and abilities.
In this fanfiction, Robin might get powers as a result of a genetic mutation triggered by a rare chemical. These powers could include enhanced speed and the ability to see in the dark. He initially hides his powers from the team because he's afraid of how they'll react. But when a dangerous situation arises where his powers could be the key to victory, he reveals them and they all work together to defeat the enemy and accept his new status.
Well, the plot could involve Marco suddenly getting super strength. He might start by accidentally breaking things around him. Then, he could learn to control his power and use it to protect his friends from some sort of villains in his town. Maybe there's an evil wizard causing trouble and Marco, with his newfound strength, is the only one who can stop him.
One possibility is that Lincoln could get super strength. He might use this power to protect his family from various threats in Royal Woods. For example, he could stop a runaway car that was about to hit his sisters.
Some fanfictions might give Naruto the power of elemental fusion. He could combine fire, wind, water, earth, and lightning in ways that are not possible in the original series. This would make his attacks extremely powerful and unpredictable. For instance, he could create a storm of lightning - infused water that not only electrocutes his enemies but also drowns them.
In a Harry Potter Kim Possible crossover fanfiction, a great plot could be that Voldemort discovers the existence of Kim Possible's world and decides to invade it to gain more power. He sends his Death Eaters to steal advanced technology. Harry, Hermione, and Ron follow them through a magical portal. There, they meet Kim and her team. Kim is initially skeptical of magic but soon realizes they need to work together. They combine magic and technology to fight off the Death Eaters and prevent Voldemort from getting his hands on the powerful tech.
Maybe Lucy discovers an ancient artifact that gives her new powers. For example, she could find a magic amulet that allows her to control the elements. Then she has to learn how to use these powers to save her town from a mysterious threat.
Well, one possibility could be that during a karate tournament, Kim gets hurt while facing a tough opponent. Jack, being her friend and teammate, blames himself for not being able to protect her better. He then decides to train extra hard to avenge her loss and also to make sure she can recover safely. This could lead to a series of events where Jack discovers new techniques and also learns more about his own limits and strengths.
Well, it could be about how they deal with the unexpected pregnancy. Maybe they face challenges from family and friends, and have to figure out their future together.