Chloe could be very empathetic. Since she has a caring nature, seeing his scars would likely make her feel sad for what he has been through. She would want to comfort him and might even get a bit angry at whoever or whatever caused those scars.
One possible plot could be that when Chloe sees Lucifer's scars, it deepens her understanding of his past traumas. She might become more empathetic towards him, and this could lead to a strengthening of their relationship. Maybe she starts to question how he got those scars and in the process, uncovers more about his true nature.
I would not recommend seeking out such fanfiction as it goes against the general spirit of the show, which is about love, redemption, and the battle between good and evil. The relationship between Chloe and Lucifer is much deeper and more nuanced than just a physical encounter, and most fan - created works aim to explore that depth rather than something so vulgar.
In the 3x11 fanfic of Chloe and Lucifer, their relationship might be explored in unique ways. Maybe it shows a deeper emotional connection that wasn't fully shown in the original series at that point. It could also introduce new plotlines centered around their characters, like how they deal with a particular crisis together.
Well, Hermione is known for her intelligence and rational thinking. When she sees Harry's scars, she might first try to analyze them. Maybe she'd wonder about the magic that caused them, and if there are any lingering effects. This could lead her to research more about dark magic or the spells that left those marks. At the same time, she'd also have an emotional response, perhaps feeling a bit of anger towards those who hurt Harry.
They could be from a fight with a powerful magical being. Maybe Loki tried to steal a powerful artifact from a wizard or a sorcerer, and in the process, he got injured and the scars remained.
He might be initially shocked. Snape has a complex relationship with Harry, and seeing those scars which are a mark of Harry's past and his connection to Voldemort could stir up a lot of mixed emotions in Snape. Maybe he would feel a pang of guilt, as he has some role in Harry's life due to his connection with Lily.
Harry's scars are a physical reminder of his encounter with Voldemort as a baby. In the fanfic, they might be a symbol of his unique identity. It sets him apart from others and makes him the Boy Who Lived. When Snape sees them, it could be a reminder of the power Harry holds, which Snape might both fear and respect in a way.
The theme of good vs. evil is common too. Chloe, representing the good, and Lucifer, with his devilish past, come together. Fanfics often play with this dynamic, like how they influence each other's views on morality and how they navigate the world with their different natures.