When Lily forgives Snape in fanfiction, it can greatly transform his characterization. It can show a more vulnerable side of him. His past mistakes might be overshadowed by the fact that Lily is willing to look past them. This could lead to a more nuanced portrayal of Snape, as he is no longer just the brooding and often unlikable character, but someone who has the capacity for change and growth due to Lily's forgiveness.
In such fanfictions, Lily's forgiveness can make Snape seem more redeemable. It softens his otherwise prickly and often dark character. His actions might be seen in a new light, as if he is now more worthy of understanding and compassion because Lily, who he cared about deeply, has forgiven him.
One aspect to consider is that Lily's forgiveness in the fanfictions might be a reaction to Snape's ultimate sacrifice. In the Potterverse, Snape had a complex character arc. Fanfiction writers might use Lily's forgiveness to show that his actions, no matter how controversial, were worthy of some form of absolution. It could also be a way to explore the idea of unconditional love, as Lily may forgive Snape regardless of his past actions against her friends and the wizarding world.
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.
Snape might be initially in shock. He had trusted Lily deeply, so the betrayal would hit him hard. He could become very angry and bitter, perhaps vowing revenge against her. He might also close himself off emotionally, not wanting to trust anyone again.
There are versions where Snape reacts defensively. Let's say Lily confronts him about his actions that seem to be harming her or her friends. He would immediately start justifying himself, listing all the reasons why he did what he did, trying to make Lily see his point of view, even if deep down he knows he might be in the wrong.
Well, it's a really heart - breaking moment for Snape. He loved Lily deeply, and seeing her with James, who he had a rivalry with, must have been like a dagger to his heart. His love for Lily was complex and seeing this would have filled him with a mix of jealousy, rage, and deep sadness.
Snape in 'Snape Saves Lily' fanfictions is typically depicted as a hero in a sense. Despite his past associations with the dark side, his love for Lily makes him turn against his former allies. He is shown to be intelligent and resourceful, using his skills in magic, especially his knowledge of potions and dark arts (but using it for good in this case), to save Lily from various threats. He is also portrayed as a very emotional character, his love for Lily being the one pure thing in his otherwise troubled life.
It would strain their relationship even more. Snape's love for Lily was already on shaky ground due to their different paths. Seeing her with James would make him feel like she has completely chosen the other side, and he might start to resent her a bit.
Well, in some fanfictions, it could be because Snape's actions towards her friends in the original story. Maybe the fanfic writer wants to explore a different side of their relationship where Lily has had enough of Snape's dark arts fascination or his association with the wrong crowd at Hogwarts.
It deteriorates rapidly. Lily is likely to be extremely hurt and angry. She probably won't be able to forgive Snape easily, if at all. Their relationship which might have had some complexity and depth before, turns into one of animosity from Lily's side.
Well, a lot of fanfictions depict Snape's love for Lily as a silent, internal struggle. He doesn't always show it outwardly, but it's always there, burning inside him. Some stories show how his love for her makes him protect Harry, not because he likes Harry, but because Harry is a part of Lily. This love is also sometimes shown as a complex emotion that is intertwined with his sense of self - worth. He feels unworthy of her love, but still can't let go of his feelings, and this internal conflict is explored in great detail in many fanfictions.