Lucy is the main protagonist of Elfen Lied. She is the Queen Diclonius, an evolutionary offshoot of the human race.
Kaede is the main character, protagonist and anti-heroine/anti-villainess of the Elfen Lied series. The so-called 'Queen' Diclonius, Kaede (also known as Lucy and Nyu) was both ruthlessly tormented and at times was herself a sadistic tormentor, driven by both the cruelty she found so often in life, but also by the knowledge that love and acceptance was possible. Her great love was Kouta, a boy she met when they were children and again when they were young adults.