The fanfiction could be about the adventures Stiles and the puppy have. They could go on hikes together in the forest near his town. During these hikes, they might encounter strange things or other supernatural beings. The puppy could either be scared or curiously investigate. Stiles would have to protect the puppy and also figure out how to deal with whatever they come across.
A Border Collie might also be a possibility. These dogs are extremely intelligent. Stiles would have a great time teaching it all kinds of tricks. The Border Collie could also help Stiles in some way, like herding or using its intelligence to solve problems that Stiles might face. It would be a very active and engaging puppy for him.
In this fanfiction, Naruto might name the puppy after one of his friends. Maybe he takes the puppy on his ninja missions and the puppy ends up being really helpful, like sniffing out traps or finding hidden enemies. It could also be that the puppy has some special abilities, like being able to communicate with Naruto telepathically.
In this fanfiction, after Stiles gets bitten by a vampire, he might find himself in the middle of a vampire war. The vampire who bit him could belong to one faction, and now the other faction sees Stiles as a threat or a tool. He has to learn about vampire politics and hierarchies quickly. His friends, especially those who know about the supernatural, would try to protect him. Stiles would also have to deal with the physical and emotional changes that come with being a vampire, like the isolation that can come from living a nocturnal life and the fear of hurting those he loves.
Perhaps in this fanfiction, Stiles has disobeyed Peter's orders which were crucial for their safety or the safety of others. Peter, being frustrated and feeling responsible, resorts to spanking as a way to show his extreme displeasure. But this kind of plot would also need to deal with the aftermath, like Stiles' reaction of anger, hurt or maybe even understanding, and how it affects their relationship moving forward.
Perhaps in the fanfiction, Nico gets the puppy as a gift from a mysterious figure. The puppy is a special breed that is only known in the demigod world. Nico has to learn how to take care of this unique puppy. He has to figure out what it eats, how to train it, and also how to protect it from the various dangers that lurk in his world.
It could be his love interest, like I mentioned before, Lydia. She might reject him because she's too focused on her own goals or perhaps she doesn't see Stiles in that way at the time. Their relationship has always been a bit complex in the show, so this would be a likely scenario in fanfiction.
Well, often in these fanfictions, Stiles becomes more confident. His physical appearance might also change, like he could start dressing better or have a new haircut that gives him a 'hot' look. For example, he might start wearing more stylish clothes that show off his personality.
One possible plot could be that Stiles is a huge Avengers fan in his own world, and through some magical or scientific mishap, he gets to meet his heroes. But it's not all fun and games. He has to prove himself worthy of being part of their team. He could also bring in some of his own world's technology or ideas that help the Avengers face a new and powerful threat.
The plot could be about Draco finding a lost puppy and deciding to take care of it. He might initially be hesitant because of his pure - blood upbringing but the puppy's cuteness wins him over. They could go on little adventures around Hogwarts, like exploring the Forbidden Forest together. Maybe Draco even uses his magic to create little toys for the puppy.
Perhaps in this fanfiction, Draco dreams of having a puppy. One day, he magically gets transported to a world where puppies are everywhere and he gets to choose one. But there's a catch. He has to complete a series of magical challenges to be able to take the puppy back to his own world. This journey could change his character, making him more empathetic and kind as he bonds with the puppy during the challenges.