Lucinda, Ruby, and Martha

Lucinda, Ruby, and Martha are characters in the Sereno Valentino novels Fairest of All and The Beast Within. They are in effect the main villains of the stories, being directly responsible for the sufferings and corruption of the titular characters and ensuring they continue to suffer.

Physical description
The characters are described as being "doll-like", having porcelain skin, almost a wooden texture to them, as well as having huge eyes and black hair. However, they had variances to each of the three. They are apparently immortal, or at least have an extremely long lifespan, as it was mentioned that their corruption of the Evil Queen occurred "years" before.

Personality
The characters were shown to be extremely manipulative and also extremely sadistic, reveling in corrupting people and/or making sure those they cursed were permanently cursed. This is especially evident with their corruption of the Evil Queen as well as how they tried many times to sabotage Beast's chances of ever undoing the curse. They also have no qualms about manipulating and/or even harming their own family members, as evidenced by their tricking their sister Circe into conducting a fool's errand as well as later her into a coma specifically to prevent her from stopping them with interfering with breaking the spell on Beast, as well as the aforementioned corruption of the Evil Queen, their cousin-in-law.

Fairest of All
They appeared while the Evil Queen was grieving for the loss of her husband, where they presented to her a mirror housing the ghost of her then-long deceased father, which had been engineered specifically to ensure she was corrupted (as they knew full well about the torment she had about her father refusing to acknowledge her as beautiful during her childhood).

The Beast Within
They have a more major role in the sequel, also being given names. Years after their corruption of the Evil Queen, they proceeded to manipulate their youngest sister, Circe, into cursing Prince Adam after he coldly dismissed her for being a commoner. Although Circe felt bad about the curse, Lucinda, Ruby, and Martha harbored no remorse for the curse and fully intended that Prince Adam remain cursed, despite it being against Circe's wishes that they not interfere. To this end, when Belle fled the castle, they sent the wolf pack after Belle to kill her, knowing full well she stands a chance to break the curse, though this ironically ensured Belle and Beast's love for each other grew stronger when the latter saved her from the wolves. In order to ensure Circe didn't stop them during this instance, they also sent Circe on a fool's errand to bargain Ursula for the Beast's former beau's life in exchange for something more important. Afterwards, they then manipulated events to have Beast killed by his former friend, Gaston, also manipulating him into releasing him to ensure Gaston, under their control, knifed Beast in the back before dying, also placing Circe in a coma to prevent her from stopping them. Despite this, Circe managed to undo the curse just in time when Belle announced her love for him.