Since I haven't read it, I can't say for sure. But it could be two individuals with very different personalities. Maybe one is a shy and introverted person, while the other is outgoing and confident. Their differences could play a role in how they interact and help each other heal.
There's no way to know precisely without reading it, but common character types in such a story could be a person who has lost someone they love, like a widow or an orphan, and another character who has some sort of self - esteem issues. These two might cross paths, and through their shared experiences of pain and the need for healing, they form a bond. They could be from different walks of life, for example, one from a wealthy family with emotional neglect and the other from a poor family with physical hardships, yet their emotional 'scars' bring them together and drive the story forward.
I don't know the exact main characters in this fanfic. However, it might feature characters who are at different stages of dealing with their scars. It could be a young adult still struggling with childhood traumas and an older person who has learned to cope with similar issues in a different way. Their meeting could be a turning point for both of them as they learn from each other's experiences and support each other's healing journey.
I'm not sure specifically as I haven't read that particular fanfic. But generally, it might be about characters whose paths cross and through their interactions, they start to heal each other's emotional or physical scars. Maybe it involves two people from different backgrounds who meet by chance and gradually help one another overcome past traumas.
Obviously, Percy is one of the main characters as his scars are the focus. As for 'the seven', they could be a group of comrades or allies. They might be characters with different personalities and abilities. Maybe they have their own backstories that will interact with Percy's story once they see his scars. For instance, one of them could be a healer who is concerned about how Percy got the scars, or a curious character who wants to know the whole story behind the scars.
Sasuke could also be a main character. His story in the original Naruto was all about choosing different paths, like whether to stay with his friends in Konoha or seek power elsewhere. In this fanfic, he could be in a similar situation, or his choices could be intertwined with Naruto's in new and interesting ways.
Hinata could also be a main character. Her relationship with Naruto could take on new dimensions as he becomes the Sage of Six Paths. Maybe she helps him in some way to control or understand his new powers, or they face challenges together that test their relationship.
There's no way to know for sure without reading the 'scars novel'. However, it might have a hero who has to deal with the stigma associated with their scars, whether they are from a battle, an accident, or something more personal. There could also be a sidekick character who helps the main character come to terms with their scars and move forward in life.
Often, the main characters are the ones who are most likely to be pushed to cross the lines in the context of the original story. For instance, in a Star Wars fanfic, it could be a Jedi who is on the verge of turning to the dark side, like Anakin Skywalker. So, those characters with the potential for inner conflict are likely to be the main focus in a 'crossing the lines fanfic'.
Alfred is a character that can't be ignored in Batman scars fanfics. His loyalty to Batman is unwavering, and he might be the one to nurse Batman back to health after getting the scars. His father - like figure could be emphasized more as he tries to help Batman come to terms with the physical and emotional changes. Another character could be Bane. He might see the scars as a sign of Batman's fallibility and challenge him to a more brutal fight, testing Batman's limits both physically and mentally.
The characters in the book included the male protagonist, Chu Huaimo, the second pavilion master of the Sky-Inviting Pavilion. The female protagonist, Qianmo, was the youngest survivor of the founding general of the Zheng Dynasty and later joined the Sky-Inviting Pavilion. The male supporting character, Jiang Wuchen, was the down-and-out master of the Luoying Villa. He was the biggest villain in the book. He was plagued by the backlash of his cultivation technique all year round and rarely showed his true face to others. The supporting actor was Xing Wu, a light-body technique genius who loved to watch the show. "Yaotian Pavilion's Crossing Paths" Author: Qian Kun Asks the Way. It is an ancient romance/hot-blooded Jianghu novel. It has been completed and can be enjoyed without worry. User recommendation: Family grudges, Jianghu love and hatred, just wait for today to end one by one. Stable updates, occasionally erupts, never eunuchs, please rest assured to eat. I hope you will like this book.
Without having read the 'Scars of Love Novel', it's impossible to say who the main characters are. However, it's likely that they are characters who are deeply involved in love relationships and are the ones who experience the 'scars' of love. Maybe there is a young couple who face challenges due to differences in their backgrounds or there could be a single character who has had multiple failed relationships and is now trying to come to terms with their past.
I don't know since I haven't read it. But they could be soldiers, given the 'battle' in the title.