Lanhua

Lanhua calls herself "The wings of desire and contentment." Michel's butterfly-like servant. She can divide into a dozen smaller versions of herself (which really do not look harmful or dangerous; in fact, very cute) to play a tune that makes the listeners dance until they die. She is called Ranfa and Lang Fa in some merchandise, but the translators for the manga followed the Mandarin Chinese pronunciation of her name and called her Lanhua. In her real form she has purple hair and red eyes, in her human disguise form the eyes are brown and the hair color is the same.
Source: