He was created the very first, as a prototype and all the other dolls were created in his image and likeness, but had other external characteristics. Lu was the leader of the puppet city and for his comfort goes to manipulation. He loves himself and his appearance very much. Prototypes can't get into the human world, so Lou thinks it's unfair that "ugly" dolls can move into the human world and be happy, but he can't. Deep down, he wants love and care, but does not admit it because of his pride.