In some fanfictions, it could be the house - elves. They might see Snape as someone who is always so gloomy and decide to give him a makeover as a way to cheer him up. They would use their skills in cleaning and mending to create a new look for Snape.
It could be the students. They might think Snape is too gloomy and old - fashioned in his appearance. So, as a bit of mischief or maybe out of kindness, they use their magic skills to give him a makeover. For example, Harry Potter and his friends could be behind it, using spells they learned in their Defense Against the Dark Arts class.
Well, one plot could be that Snape is forced to have a makeover by the other Hogwarts teachers for a special event. They transform his drab robes into something more stylish, and his greasy hair into a sleek look. This new look makes the students see him in a different light, and some even start to respect him more. He initially hates the makeover but then realizes it has some benefits.
In a fanfiction, the makeover could be part of a spell gone wrong. A new spell created by Hermione accidentally affects Snape instead of its intended target. His appearance changes completely. His greasy hair becomes shiny and smooth, his sallow skin turns a healthy complexion, and his robes transform into a sleek, well - fitted set. This new look makes the other teachers see him in a different light, and they start to include him more in social events at Hogwarts, much to Snape's initial discomfort but eventual enjoyment.
Sakura could be one of the main people to give Naruto a makeover. She has always been concerned about appearances to some extent and might see Naruto's scruffy look as something that needs changing. She could use her medical ninjutsu skills to give him a more refined face structure, like getting rid of some of his minor scars, and then style his hair in a more modern way.
Most likely Sonic's friends like Tails and Knuckles would be involved. Tails could be the one coming up with new technological enhancements for Sonic's makeover, while Knuckles might offer some advice on how to make Sonic look more tough.
Obviously Hermione herself is the central character. But her friends like Harry and Ron would surely be involved. They might be shocked or supportive of her new look. Also, characters like Draco Malfoy could be involved. He might react with jealousy or new - found interest depending on how Hermione's makeover changes her overall presence.
Harry Potter could visit Snape in the hospital. Despite their past differences, Harry might feel a sense of obligation or curiosity. He could be there to finally have an honest conversation with Snape and perhaps gain a better understanding of his actions throughout the years.
I think Hermione Granger is very likely to have a makeover. Her appearance could be updated, perhaps with a more stylish wardrobe. Her character could also be changed to be more laid - back and less uptight about following the rules all the time. Ron Weasley is also a candidate. He could get a makeover in his confidence level, becoming more self - assured and less jealous. And Snape could have a makeover too, maybe his backstory could be changed to make him more of a misunderstood hero from the start.
Well, Snape could punish Draco by making him write lines about the importance of Slytherin values. Since Draco is a Slytherin and Snape has a certain pride in the house. For example, he might have to write 'Cunning is a Slytherin strength and should be used for the good of the house' a hundred times. This not only disciplines Draco but also reminds him of his house identity.
Dumbledore might come to Snape's aid. Dumbledore always had a somewhat complex relationship with Snape, and he would likely step in to prevent things from getting too out of hand. He could use his powerful magic to stop Hermione and then try to sort out the situation calmly.