Lucille is the leading lady in A Monster In Paris.
Lucille is feisty, yet soft and elegant when she sings. She seems to hate Raoul,but at the end of the movie she likes him. Also, before that moment, Raoul has a flashback of Lucille taking his toy when he was little.
Lucille is a singer at one of the cabarets in Paris, and she sings very well. She wears a different outfit all the time, except when she performs. She "adopted" Francoeur. Since she found him and named him, it's possible that she "adopted"