In the fanfiction, the OCs could be from different dimensions. A cat OC from a dimension where cats and mice are friends comes to Tom and Jerry's world. This OC tries to teach Tom that there are other ways to interact with Jerry, leading to a series of comical and heartwarming situations as Tom struggles to adapt to this new concept.
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.
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.
One idea could be that Jerry accidentally stumbles upon a magic potion that makes him pregnant. Tom, being his usual self at first, is confused but then gradually becomes protective of Jerry. Another could be that a new female character enters their world and somehow both Tom and Jerry have a connection to the pregnancy, leading to an unusual alliance between them.
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.
One idea could be an OC who is a new neighbor in Talking Tom's town and has a special musical talent. This OC could start a band with Talking Tom and his friends, leading to all sorts of musical adventures like competing in a big music competition against a rival band.
One interesting concept could be Tom and Jerry as human detectives solving mysteries in a big city. They might use their classic chase skills in a new way to catch criminals.
One idea could be exploring Tom Riddle Jr.'s relationship with the original characters in a new way. For example, how he might interact with Dumbledore when there's an OC involved. Maybe the OC has a special power that Dumbledore is interested in, and Tom Riddle Jr. sees this as a threat or an opportunity. Another plot idea could be the OC coming from a different magical culture and introducing Tom Riddle Jr. to new forms of magic, which could either corrupt him further or, surprisingly, make him question his dark path. Also, a plot where the OC is a time - traveler and tries to prevent Tom Riddle Jr. from becoming Voldemort could be really exciting, full of twists and turns as they battle against fate.
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.
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.