A Mysterious New Addition

So here I am minding my own business, when out of nowhere this gloomy chick just shows up!

She didn't say anything, other than like three words she was mumbling, and then just sat in the corner...hovering...

I'm not quite sure who this gal is, but I'm a bit too afraid to approach her

Anyways, here's the newest addition to the cast, as I don't believe she wishes to leave, or will even let me attempt to get her to leave, so I guess she's here to stay!

Any idea who she is?

(Sorry, no prize for guessing right, as it might be more than obvious to a few people.  I just really loved that I could get this look with her and decided to take a pic!)

Enjoy!