In some fanfictions, James might apologize to Snape as part of a plot to bring about a greater good. For instance, to unite different factions within the wizarding world. He realizes that his past enmity with Snape was counterproductive and that by apologizing, he can start to heal old wounds and build a more positive future for everyone.
One reason could be that James finally realizes the extent of his bullying. In the original story, James often harassed Snape. In fanfiction, he might come to understand how much pain he caused Snape and feel genuine remorse. Another reason could be that he discovers new information about Snape that makes him see Snape in a different light. For example, he might find out about Snape's love for Lily and how his actions towards Snape affected Lily as well.
In some fanfictions, Snape might see this as an opportunity for his own growth. He might accept the apology gracefully, realizing that holding onto grudges isn't helping him. This could lead to a new relationship between them, where they start to understand and respect each other, or at least tolerate each other's presence.
One reason could be jealousy. Snape might be jealous of James' popularity and charm. James, on the other hand, could be jealous of Snape's close friendship with Lily in their early years. Another reason is their different personalities. James was outgoing and bold, while Snape was more introverted and brooding. Lily might be attracted to different aspects of each of them, which could lead to the fight as they both compete for her attention.
One possible reason could be for misjudging Snape all those years. Harry might have finally realized that Snape was on the good side all along, working as a double agent against Voldemort. This realization could lead to his apology as he understood how much Snape sacrificed and how wrongly he was treated by Harry and others at Hogwarts.
Perhaps Snape believes that James has some crucial information that he needs and he thinks torture is the quickest way to get it. Or maybe there's a power struggle going on. Snape wants to assert his dominance over James, who might be seen as a rival in some way, either for a position at Hogwarts or in the wizarding community. Also, it could be due to a misunderstanding that has spiraled out of control, leading Snape to think that James is a greater threat than he actually is.
In some fanfictions, it could be related to Lily. If James did something that Snape perceived as a threat to his relationship with Lily, even if it was just being overly affectionate with her in front of Snape, Snape might lash out at James. Snape had deep feelings for Lily, and any sign of James getting in the way could trigger an attack.
One reason could be a misunderstanding during a battle. Maybe Steve made a strategic move that put Tony in danger without realizing it fully. Another might be that Steve said something harsh in the heat of an argument, like criticizing Tony's technology when it was actually saving lives. Or perhaps Steve made a promise to Tony and failed to keep it, which made him feel guilty and led to the apology.
Perhaps in the fanfiction, James is seen as more accepting of Lily's friends and her social circle. Snape, on the other hand, might be associated with a darker crowd or have some beliefs that Lily doesn't agree with. For example, if Snape is too involved with the Dark Arts in the fanfiction, it could be a turn - off for Lily.
Lily. Since Snape and Lily were friends when they were young, and James had a crush on Lily. Snape might have had a special connection with Lily that James desired, so he could be jealous. Also, Snape was always kind of an enigma, and that mystery around him might have made James jealous as well. He might have thought Snape had some sort of power or charm that he didn't.
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.'
One possible reason could be that she might have underestimated Naruto in the past. She often belittled his abilities and dreams, but as she grew and realized his true strength and determination, she felt the need to apologize for her previous behavior.