Birthmarks can be a unique feature in a character setting, serving as a physical trait that distinguishes one character from another. Birthmarks can also serve as a visual cue for readers or viewers to easily recognize a character. In some stories, birthmarks may hold symbolic meaning or be tied to a character’s backstory or identity. Birthmarks can also add depth and complexity to a character, as they may be a source of insecurity or pride for the character. Overall, birthmarks can be a small but impactful element in creating a rich and memorable character.