In some fanfictions, Snape's love for Lily might be so strong that it affects the magical abilities of the animals in Animalia. Maybe the unicorns become more powerful when Snape is near, because his love for Lily gives off a pure energy that the unicorns can feed on and enhance their own magic.
It might also influence the way the animals in Animalia interact with Snape. If they sense his deep and unrequited love, they could either be sympathetic or try to play matchmaker in a magical way. For example, a group of fairies could try to bring Lily's spirit closer to Snape through their magic.
In some fanfictions, the Animalia aspect might involve Animagus forms. Snape could be an Animagus of an animal that has a special connection to Lily. Say he's a deer, which was Lily's Patronus. This would create a very unique and poignant dynamic in the story, as he would be symbolically closer to her in this form.
Well, in fanfictions where the Marauders bully Lily and Snape, it has a huge impact on their personalities. Snape is constantly on edge, always expecting some sort of attack from the Marauders. This makes him more guarded and less likely to trust others easily. His love for Lily becomes more of a desperate and often self - destructive thing. For Lily, the bullying situation forces her to take sides, either with Snape, who she has a long - standing connection with, or with the Marauders, who seem to be more popular and have a certain charm. This decision - making process can shape her character in different ways depending on the author's take in the fanfiction.
It could make Snape more bitter. Since he lost Lily to James, he might become even more withdrawn and focused on his own studies or other solitary pursuits. This could further isolate him from others and fuel his resentment towards James and his group.
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.
Snape's love for Lily made him turn against Voldemort. When he found out that Voldemort was going to kill Lily, he pleaded with Dumbledore to save her. This led to him becoming a double agent, spying on the Death Eaters for the Order of the Phoenix.
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.
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.
Fanfictions often show Snape's unrequited love through his inner thoughts. He might be constantly thinking about Lily while she's with James. For example, he'll watch her from afar and have these deep, melancholic musings about what could have been.
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.
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.