One popular 'Stiles gets revenge' fanfiction might be where he uses his intelligence to outwit those who have wronged him. For example, in a story where he was bullied by some supernatural beings in Beacon Hills, he could set up elaborate traps using his knowledge of the town's layout and the creatures' weaknesses. He might use his wits to make them look foolish in front of the whole town, which would be a great form of revenge.
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.
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.
He might use his knowledge of the supernatural world. If a creature has wronged him, he could find its weakness and use it against it. Like if a werewolf has been too aggressive towards him, he could use wolfsbane in a non - lethal way to teach the werewolf a lesson. This would be a form of revenge that is also within the rules of the supernatural world.
His relationship with his friends would likely become more strained. They might be afraid of him or he might be afraid of hurting them. For example, his best friend Scott, who is also involved in the supernatural world, might be worried about Stiles losing his humanity.
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.
Well, in a lot of these fanfictions, Stiles can get beat up due to his own recklessness. He might be so determined to solve a mystery or help his friends that he doesn't think about the consequences and ends up in a dangerous situation where he is outnumbered and beaten up. Also, there could be miscommunication. Maybe someone thinks he has done something wrong when he actually hasn't, and they take matters into their own hands and beat him up.
One common way for Marinette to get revenge in fanfiction could be through her fashion skills. She could design something that makes Lila look foolish. Like creating a dress for an event that has a hidden message or design that mocks Lila's lies when she wears it. It's a more creative and less confrontational way of getting revenge, but still very effective in showing Lila that Marinette is not one to be trifled with.
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.
One great Stiles gets injured fanfiction is 'Healing the Broken'. It shows Stiles getting injured during a battle with a supernatural creature. His friends, especially Derek, are by his side trying to heal him. Another is 'Stiles' Painful Ordeal' where his injury is a result of a mysterious spell gone wrong. The story focuses on how he copes with the pain and recovers with the help of his pack.