The main character could be an outcast from society who has become invisible, either literally or metaphorically. And there might be antagonists in the story as well, such as those who want to exploit the invisibility for their own gain or those who are afraid of the unknown and try to hunt down the invisible being.
I'm not sure specifically without having read it, but it could be the invisible woman herself as a main character, along with people in her life like her family, friends, or colleagues who might be related to her feeling of invisibility.
I don't know the exact characters as I haven't read the novel. But there must be the invisible girl herself, of course. There could also be some characters who interact with her, like a friend who tries to understand her invisibility or a foe who takes advantage of it.
The main character is the Invisible Man himself. He is a complex figure who experiences invisibility and the alienation that comes with it.
The main characters are likely to be the ones that drive the story forward. They could be characters who have some kind of special relationship or are involved in the exploration of the invisible thread concept. Maybe there's a character who discovers this invisible connection and then tries to understand it more, and those around him or her would also be important characters.
Perhaps the main character is a journalist who is investigating a strange phenomenon related to invisible light. Along the way, they meet a reclusive inventor who has been working on a device that can manipulate invisible light in ways that no one has ever seen before. The two of them then team up to uncover the truth behind the phenomenon, facing various obstacles and antagonists who want to keep the secrets of invisible light for themselves.
Ivan Isaenko himself is of course the most important character. He is the central figure through which the whole story unfolds.
Addie Larue herself is of course the most important character. She is the one with the strange curse of immortality and invisibility in a sense. Henry is also very important. He is the one who can remember Addie, and their relationship is central to the story. Then there are the various people Addie meets throughout the centuries, like the villagers in her hometown at the start, who play a role in shaping her understanding of the world and her situation.
The central character is the Invisible Man. He has a complex personality. There are also some supporting characters like the people he used to know before becoming invisible. For example, his colleagues or friends who now become the targets of his sometimes erratic behavior. And the police officers who are trying to figure out what's going on with all the strange happenings caused by the invisible man.
Since I'm not familiar with this graphic novel, the main characters might be individuals who represent different sides of the 'invisible war'. For example, there could be a journalist who is trying to expose the truth about the hidden conflict, and on the other side, there might be those who are trying to keep the war invisible. They could be politicians, powerful businessmen, or members of secret societies.
Since I don't know the exact 'the invisible mom story', it's difficult to say. But most likely the main character would be the mom who is invisible. There might also be her family members like her husband and children who could be important characters as they are related to her invisibility situation in some way.