Maybe Patch discovers a hidden talent for something like painting or dancing. The other dalmatians are initially skeptical but then come to support him. This could involve some fun interactions and a bit of a self - discovery journey for Patch.
Pongo and Perdita, as the parents of the dalmatians, would surely interact with Patch. They could offer him advice, scold him when he's misbehaving, or be proud of him when he does something good.
They could go on a journey to find a hidden treasure in the city. Maybe they discover an old map in an alley and follow it, facing various challenges like mean cats and big puddles along the way.
One possible plot could be that the Dalmatians discover a hidden talent among them, like the ability to communicate with other animals in a special way. They use this talent to save their neighborhood from a new threat, perhaps a developer who wants to destroy their park.
A third idea is to set the fanfiction in a modern-day scenario where the Dalmatians become famous on social media. The 102 Dalmatians have their own Instagram account and attract the attention of a big Hollywood producer. But there are also some jealous animals who try to sabotage their new - found fame.
One idea could be that the jewel is a magical heirloom of the Dalmatian family. It has the power to protect them from the evil Cruella. The puppies go on an adventure to find the jewel when they sense Cruella's return.
They could save a group of kittens from a burning building. Lucky uses his speed to run in and find the kittens, while Patch figures out a way to lead them to safety through the smoke.
One plot idea could be Waddlesworth getting lost in the big city and having to find his way back to the Dalmatians. He could encounter various other animals along the way, some friendly and some not so much, which would make for an exciting adventure.
A plot could revolve around Roger and Anita hosting a big party for all the dalmatians' friends. They have to plan everything from the food to the entertainment. Roger might be in charge of the music and Anita the decorations. Along the way, they encounter some problems like not having enough food or a sudden rainstorm threatening to ruin the party, but they manage to solve them together.
One idea could be exploring how the dalmatians' world is connected to the Kingdom Hearts universe in terms of magic. Maybe the dalmatians have a special kind of magic within them that can help Sora in his battles. Another could be a story where the dalmatians are being hunted by Heartless and Sora has to protect them. Also, perhaps there's a secret about the dalmatians' spots that has significance in the Kingdom Hearts lore.
One idea could be that the puppies discover a hidden map in their doghouse that leads them to a long - lost treasure of the Dalmatians. They then have to outwit Cruella de Vil's descendants who are also after the treasure. Another could be that the puppies befriend a group of stray animals in the city and together they work to rescue a group of kidnapped puppies from an illegal pet - trading ring. A third idea is that the puppies find a magical portal that transports them to a different world where they have to use their wits and unique Dalmatian skills to find their way back home while also helping the creatures in that strange world.