One idea could be a story where Snape's hair hanging in his face is a symbol of his inner turmoil. Maybe he's hiding his emotions or secrets behind that curtain of hair. Another could be a romantic fanfiction where his love interest is the first to gently brush his hair aside, creating a very intimate moment.
In a fanfiction, Snape's hair hanging in his face could be part of a magical disguise. He might be using it to conceal his true identity from someone or something. It could also be related to a curse where he can't move his hair out of his face until he completes a certain task. For example, he has to make amends with a former enemy, and as he progresses towards that goal, his hair gradually starts to move away on its own.
The hair in his face could be a sign of his focus. He is so deeply immersed in his potions and magic research that he doesn't bother to fix his hair. It could also represent his disregard for his own appearance in the face of his greater goals. In a fanfiction, when he starts to care about something or someone outside of his usual interests, his hair might change as a sign of this shift. For example, if he falls in love, he might start to take more care of his appearance, including his hair.
Another plot could involve Snape having his hair in a ponytail during a time - traveling adventure. He travels back to his own school days, and his ponytail becomes a sort of symbol of his future self. He has to interact with his younger self and other characters while sporting this new - look ponytail, which causes all sorts of interesting reactions.
One interesting Snape hair fanfiction could be about how his hair has a magical property. For example, it might be able to sense danger and change color accordingly. In some stories, his hair could be a key element in a mystery where students try to figure out the secrets it holds.
Well, a possible plot could be that Snape loses his memory due to a powerful dark magic spell gone wrong. He forgets his identity completely. The story could then focus on how the other Hogwarts professors try to help him. For example, Dumbledore might use some ancient magic to try and restore his memories. Meanwhile, Voldemort could sense that something is off with Snape and send his Death Eaters to investigate. This would create a lot of tension and drama in the story.
One plot idea could be that Snape kidnaps a student he suspects of being involved in a dark magic plot against Hogwarts. He wants to question the student privately to get to the bottom of it. Another could be that he kidnaps someone he believes has information about Voldemort's next move, thinking he can protect that person and extract the information at the same time. Or perhaps he kidnaps a character in a fit of jealousy or to protect them from a greater danger he foresees.
One common theme is the idea of a new identity. When Snape has his hair tied back, it can symbolize a different side of him emerging. Another theme is the reactions of other characters. They might be surprised or intrigued by his new look.
Maybe in the fanfiction, Snape is on a secret mission to retrieve a powerful magical object that has somehow ended up in the Teletubbies' land. He has to interact with the Teletubbies to find it. Tinky Winky could be the one who unknowingly leads him to the object after Snape helps him fix his bag.
One interesting idea could be Snape finally getting the recognition he deserved in the afterlife. Maybe he is reunited with Lily and she thanks him for all he did to protect Harry. Another could be that he gets to teach in a magical afterlife school, sharing his vast knowledge of potions and the Dark Arts.
Well, a possible plot is her journey to discover her own identity outside of being Snape's daughter. She could be a talented witch in a different area than her father, like divination while he was into potions. And she might have to deal with people who either idolize or hate her father, which adds a lot of drama to her life.
A possible plot in a Naruto with long hair fanfiction could be that he's on a mission in a far - off land where having long hair is a sign of great power. Naruto, being Naruto, decides to grow his hair long to blend in and gain the respect of the locals. As he does this, he discovers new fighting styles that are based around using his long hair as a weapon or a tool. Another interesting plot could be that Naruto's long hair is a result of a curse placed on him by an enemy. He has to find a way to break the curse, but in the process, he realizes that the long hair also gives him some unexpected advantages in combat. For example, he can use it to sense the movements of opponents or to distract them during a fight.