Like her sister, the second daughter of King Lear, Regan, is distinguished by cunning and unprecedented malice. At first, Shakespeare portrays her as a very kind and pretty girl. She is polite to her father, does not argue with men and is upset when she learns of Edgar's betrayal. But her behavior is deceptive and is calculated only for superficial observers. She hates the ruler. Regan is more skilled in the craft of deception than Goneril. She admires her own game. Sometimes her cruelty is really amazing. It does not count with age or status of a person, which is clearly demonstrated by an episode with the plucking of the beard of Gloucester. Her humanity is only briefly manifested in the wounds of Cornwall.
Regan in the Essays