A very sexual girl that doesn't realize she's being used for sex for a long period of time. A guy calling his girl his "Butterfly Pixie" is basically calling her his "cute little sex toy". She's abnormally stupid, and will do anything for love, even though she's only getting sex. She might think she's special, but of course, she never will be. The guy will just use her for sex until a better Butterfly Pixie comes along, or until he gets a real girlfriend.
A humanoid species of small stature that usually wears crazy clothing that resembles leafs, bark, or organic materials. These creatures are easy to recognise as there is a distinct difference between them and ordinary pixies. The main differences are that they behave chaotically, and incite people around them to join in with thier chaotic misadventures. Chaos pixies are truely unique, and if you are lucky enough to spot one than it won't be long before the silly chaos and giggling antics effect you!
You could tell she was a chaos pixie by the way her silly antics created unfolding chaos around her.
A manic pixie dream girl that is broken or jaded in some way and often has a tragic backstory usually suffers some form of mental illness usually a personality, mood, or dissociative disorder and/or ptsd due to/from a traumatic event in her past
Examples of the manic depressive pixie dream girl would be ophelia from hamlet or misaki nakahara from the anime adaptation of welcome to the nhk