Ilulu

A Chaos dragon who targets Tohru because of her relationship with a human, attempting to destroy the city in the process. She then turns her eye to Kobayashi, trying to drive her and Tohru apart to prove her beliefs, but after Kobayashi and Tohru save her from an Order dragon she has a change of heart and ends up living with them. Ilulu appears in her human form as a petite girl with massive breasts and wide hips.

(Source: Wikipedia, edited)