Lusy is a character from the game Girl Beats Hero, by Boko877. She's Auphemia's most skilled maid. She has a plump and soft body which she uses to smother her opponents, mostly with her thighs. She also has an hypnotic voice that allows her to lull her opponents to sleep. 
Auphemia always entrusts her the mission to dispose of her... unwanted visitors in the castle. She always looks sleepy. Despite what she does to her opponents, she never talks down to them and she never acts in a vulgar way.