She might use her extensive knowledge of magic. For example, she could brew a complex potion that cures a deadly curse Snape has been afflicted with. Hermione is known for her academic excellence in potions, so it's very likely she'd use this skill to save him.
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.
Another way Snape could comfort Harry is by standing up for him in certain situations. Maybe when other teachers or students are being unfair to Harry, Snape steps in and defends him. This act of protection can be a great source of comfort for Harry, as it shows that someone is on his side even if they have had a rocky relationship in the past.
In this fanfiction, the baby's life would be full of unique experiences. Since Hermione is well - versed in many areas of magic, the baby would have an excellent education from home. Snape, being a strict father figure, would ensure the baby has a strong sense of discipline in magic. However, the baby would also face the pressure of living up to the legacies of both parents. It might feel the need to prove itself in potions like Snape and in academic studies like Hermione. Also, the family might be shunned by some in the wizarding community who can't accept their relationship, which would add to the baby's hardships.
An OC can be a friend. In fanfiction, a friendly OC could provide Severus with the support he lacks in the original story. This could help him deal with the bullying from James Potter and his gang more effectively.
The love of Severus Snape's life was Lily Evans. He had deep, unwavering love for her since their childhood. His love for her was so strong that it influenced many of his actions throughout his life, even his decisions in the wizarding war.
Snape might initially be shocked. He's not one to show much emotion openly, but internally he could be very disturbed. He might start investigating what happened to Hermione immediately, using his skills in potions and magic to try and find a cure or at least understand the cause.
Snape could initially be skeptical. Given their long - standing enmity, he might not believe that Harry's apology is sincere at first. He might respond with a cold glare or a sarcastic comment, like 'Potter, your apologies are as empty as your head.'
To evaluate Snape's characterization, look at how his loyalty is portrayed. In the original series, he was loyal to Dumbledore but also had a complex past with Voldemort. His relationship with students, especially those in Slytherin, should also be considered. If he's too soft or too harsh compared to the books, it might be a sign of poor characterization.
There could be other Death Eaters that Snape knew in his life. In the afterlife, they might be there to either confront him about his double - agent status or to seek redemption themselves. And sometimes, characters from Snape's childhood, like his parents or childhood friends, might appear to add more depth to his backstory and his experiences in the afterlife.