One possible plot for this fanfiction is that Pitch Black, as a cat, is found by a kind-hearted human. At first, he resents being in this new form and tries to escape. But as time passes, he starts to form a bond with the human. He might use his cat abilities to protect the human from otherworldly threats that still lurk in the shadows, all while learning to adapt to his feline body.
Well, the plot could involve Pitch Black, now in cat form, trying to navigate a world full of strange new sensations. Maybe he's on a quest to regain his original form. He could be befriending other animals who help him in his journey, and along the way, he discovers the simple joys of being a cat, like chasing mice or lazing in the sun.
Well, perhaps Pitch Black, now as a cat, could be on a quest to find a way back to his original form. He might encounter other magical creatures in the cat world who either help or hinder him.
Well, in his cat form, Pitch Black could become more territorial. He might hiss at other animals or people who come too close to his 'domain'. His once menacing presence could be translated into a more stealthy and watchful nature. He would still be cunning, but now he would use his cat - like abilities to his advantage, like sneaking up on things. And perhaps his patience would increase, as cats are known to wait for the perfect moment to pounce.
A group of hunters could be the main antagonists. They might be after Pitch Black because they sense that he's not an ordinary cat. They could have some connection to the dark forces that Pitch Black was originally associated with. They want to capture him and use his powers for their own gain, not caring about what will happen to Pitch Black in the process.
One interesting plot twist could be that Sakura, as a cat, discovers she can communicate with other animals and they lead her to a hidden magical place. This place holds the key to turning her back into a human but also reveals a dark secret about why she was turned into a cat in the first place.
One great fanfiction with this premise could be 'Midoriya's Feline Adventure'. In it, Midoriya's transformation into a cat brings out some really cute and funny situations. His friends initially don't recognize him, and there are a lot of misunderstandings that lead to comical scenes. For example, Bakugo tries to shoo him away thinking he's just a stray cat, not realizing it's Midoriya.
One possible plot could be that Nolan's transformation into a cat is part of a curse. In the Teen Wolf world, curses are not uncommon. He could then be taken in by one of the main characters, who doesn't initially realize it's Nolan. As Nolan tries to communicate his identity, he discovers that there are other forces at work that want to keep him as a cat. He has to use his cat - like abilities, such as stealth and agility, to outwit these forces and find a way to break the curse.
One possible plot could be that Pitch Black, being the King of Nightmares, tries to corrupt Toothiana in some way. Maybe he wants to use her connection to the Tooth Fairies to spread fear among children. But Toothiana, being strong - willed, resists him and tries to turn him from his dark ways.
In the 'Harry Potter gets turned into a cat' fanfiction, there could be a lot of comical situations. Imagine Harry trying to attend classes as a cat. He might jump on desks, knock over ink bottles, and cause chaos in the classroom. His professors would be very confused about this strange cat's behavior. And when it comes to fighting Voldemort, it would be a very different scenario. He might use his cat - like agility to dodge spells, but also have to find a way to cast his own magic in this new form.
Well, he might have to rely on others for basic things like getting food. Since he's a cat, he can't open cupboards or cook. He'd probably be really frustrated at first, hissing at anyone who tries to touch him out of pride. But eventually, he might warm up to some people, especially if they give him fish.
One possible plot could be that Black Widow, while on a mission, gets hit by some sort of experimental weapon or magic spell that reverts her to a child. She then has to rely on her Avengers teammates to protect her while they search for a way to reverse the effect. Her skills as a child would be limited, but her intelligence might still be intact, leading to some interesting situations where she tries to communicate complex ideas in a child's body.