One idea could be that Tom and Jerry get transported into a different cartoon universe like the world of Scooby - Doo. They could team up with the Mystery Inc. gang to solve a mystery that involves a cat - and - mouse - like phantom. Tom would be initially scared but Jerry would be all for the adventure, leading to their usual comical interactions within this new setting.
A really fun plot would be if Tom and Jerry were suddenly shrunk down to a very small size. They find themselves in a world that seems huge to them, like their own backyard has become a vast jungle. They have to rely on each other's skills. Jerry's small size and ability to hide in tiny places, and Tom's hunting instincts (even though he's not hunting Jerry now) to survive and find a way to get back to their normal size.
Another interesting fanfiction concept is to set the story in a different era, like the future. Tom could be a robotic cat still programmed to catch Jerry, who has also evolved in some way. They could be in a high - tech house with all sorts of new gadgets that they use in their chase and escape scenarios.
Well, in a human Tom and Jerry fanfiction, they could be neighbors in a small town. Tom is a clumsy gardener and Jerry loves to play pranks on him by moving his gardening tools. Or perhaps they are both actors in a silent movie era, with Tom always chasing Jerry around the set during filming breaks. It would be a fun and different take on their relationship.
Maybe the OCs are new neighbors in the house. A friendly OC mouse befriends Jerry and they try to convince Tom to stop chasing them by showing him the joys of friendship. They could all go on adventures together around the house and yard, like exploring a hidden attic full of old treasures.
Well, perhaps a stray cat that Tom befriends turns out to be pregnant. Tom, who has always been a bit of a ladies' cat, feels a sense of responsibility. Jerry, on the other hand, is skeptical at first but as he sees Tom's determination, he joins in to protect the pregnant cat from other threats in the neighborhood. It could lead to a story about friendship and unexpected alliances.
In some 'tom and jerry fanfic', they could be transported to a different world, like a magical land. Tom might have to deal with strange new creatures while Jerry tries to find a way back home, and their relationship could take on new and interesting twists in this unfamiliar setting.
A great plot could be that there's a food - themed mystery. A new, strange food is making people act weird in town. Scooby Doo and Shaggy are, of course, very interested in the food aspect. Tom and Jerry are also drawn to it because it smells so good. Tom wants to keep Jerry away from it, but they all get caught up in finding out where the food is coming from and why it has such an odd effect. The gang uses their detective skills, while Tom and Jerry's constant chasing around the food sources actually uncovers some hidden secrets about the mystery food.
First, decide on the other universe or characters you want to cross Tom and Jerry over with. This will set the stage for your story. For instance, if it's a superhero universe, think about how Tom and Jerry's personalities would interact with superheroes and villains.
Typically, 'tom x jerry fanfic' often plays with the idea of their relationship. It might show them in situations where they cooperate instead of their usual chasing. For example, in some fanfics, they might team up to face a common enemy.
A common theme is friendship. Despite their constant chasing, in fanfic they often show a deeper bond. For example, when Jerry gets into real trouble with an outside threat, Tom might come to his rescue.