Dumbledore would likely visit Snape in the hospital. As his mentor and the one who knew him best, Dumbledore would come to check on his condition, offer words of wisdom, and perhaps discuss future plans for Hogwarts and the fight against Voldemort. Their conversation could be filled with cryptic remarks and veiled instructions.
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.
Luna Lovegood might visit Snape. She has a unique perspective on people and could bring some of her strange but comforting items, like a charm to ward off bad dreams. She might just sit by his bedside and talk about thestrals or other magical creatures, which could either annoy or amuse Snape.
His best friend Grover would surely visit him. Grover would bring some of Percy's favorite foods from Camp Half - Blood, like blue cookies. Annabeth would also be there. She'd probably be reading books on mythology, trying to find a way to help Percy get better faster.
His teammates, Sasuke and Sakura, would surely visit him. They are his closest comrades, and they would be worried about his condition.
Ino would most likely be there too. Since they have been friends since childhood, Ino would be worried about Sakura's condition. She might bring some flowers and stay by Sakura's bedside, chatting with her about their memories and the village.
His friends like Misty and Brock would probably visit him.
Hermione would surely visit. She'd be there with a stack of books, ready to help Harry catch up on his studies while he recovers. And Ron would be right beside her, probably with some treats from the Hogwarts kitchen.
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.
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.
One possible plot could be that Snape is injured during a battle against dark wizards. He ends up in the hospital wing at Hogwarts. While there, students who once feared him start to see a different side of him as he is vulnerable. Hermione might visit him out of curiosity and they end up having deep conversations about potions and the wizarding world's future.
It's hard to say who would be the clear winner. Hermione is intelligent and quick - witted, but Snape has years of experience and a great deal of magical knowledge. If it's a battle of words, Hermione might hold her own for a while, but Snape could use his authority to shut her down.
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.