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.
Another possibility is that they are the result of Loki's own experiments. Loki is known for his trickery and his interest in magic. He might have been experimenting with some dark magic that backfired and left him with scars.
Thor could also become very angry. Not at Loki, but at whatever or whoever caused those scars. He might vow to avenge Loki and seek out those responsible. For example, if the scars were from a battle with a particular enemy, Thor would be determined to confront that foe.
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.
They could represent his past traumas. Each scar is likely a reminder of a difficult encounter or a battle he has faced.
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.
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.
She might be shocked at first. Fleur is used to beauty and perfection, and Harry's scars are a sign of his many battles and hardships. So she could show a moment of wide - eyed surprise.
His character could also develop in terms of his powers. Maybe the abandonment was related to his latent magical abilities. He could start exploring and mastering his powers more in the fanfic. Thor's presence could either be a hindrance or a help. If it's a help, Thor could encourage Loki to use his powers for good, which would be a big step in Loki's character development.
One possible plot could be that Molly, seeing Harry's scars, is filled with a deep sense of pity and motherly love. She might then recall all the hardships Harry has been through and vow to protect him more. It could also lead to a heart - to - heart conversation between them where Harry reveals more about his traumas associated with getting those scars.
One possible plot could be that Sirius, upon seeing Harry's scars, is filled with rage and a renewed determination to fight Voldemort. He might see the scars as a symbol of all the pain Harry has endured and vow to protect him even more fiercely.
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.