If his new look is a sign of a change in his personality, it can have a huge impact on the plot. For example, if he looks more confident, he might take on more risks and challenges. This could lead to him getting involved in dangerous situations or starting new adventures that he wouldn't have considered before. His new look can be a catalyst for different events in the fanfiction, either positive or negative depending on how the story is crafted.
Well, in these fanfictions, Stiles' injury can completely shift the plot. Firstly, it can introduce a sense of urgency. The other characters need to find a way to heal him quickly, which can lead them to new places or new characters who might have the cure. Secondly, it can affect the emotional arc of the story. Stiles might become more withdrawn or more determined, depending on how he copes with the injury. This in turn affects how the other characters interact with him and how the overall story progresses. It can also expose hidden strengths or weaknesses in the group as they deal with his injury.
It can create a lot of drama. It might lead to Stiles feeling isolated and having to deal with the pregnancy on his own, which can be a major plot point. Maybe Stiles will then try to prove himself independent or try to find other support systems.
Stiles might become more guarded and distrustful. His experiences with an abusive mom could make him hesitant to open up to others. He may also develop a strong sense of self - reliance as he learns not to depend on her for emotional support.
Hermione's new look could make Harry more protective. For example, if she changes to look more alluring, he might worry that she'll attract unwanted attention from the wrong sort of wizards. This could strengthen their bond as he looks out for her more than before.
It might make him more confident if he looks more stylish or powerful.
If he changes to a more approachable look, like wearing lighter colors and having a more open expression, his relationship with his students could improve. They might be less intimidated and more willing to ask him for help. For instance, Neville Longbottom could finally feel comfortable enough to approach Snape for extra Potions lessons.
His language ability can often drive the plot by allowing him to communicate with characters that others can't. For example, if there's a secretive group that only speaks a rare language, Stiles can get information from them.
On an emotional level, it can be a sign of trust. Stiles wearing Derek's clothes shows that he trusts Derek enough to be that close to him, and Derek might feel honored. This mutual trust can lead to more open communication between them. For instance, they might start sharing their deepest secrets and fears, which they hadn't done before. It's like the act of wearing the clothes is a catalyst for a more profound and meaningful relationship.
Some fans might feel discouraged. If the sheriff, who is an important character in the show, blames the fanfiction, fans who write or enjoy it could feel like their creativity is not welcome. They may stop creating new fanfiction or sharing it.
The 'new spring' might accelerate the plot. As it often represents newness and change, it could introduce new elements or events that drive the story forward.