She's called Black Heart, who is Lastation's CPU.
CPU in human form? Yes. She's one of the four Goddesses from Hyperdimension Neptunia, a video game with an interesting plot based on the seventh gen console wars between 4 leading manufacturers.
Goddess generally carries an elegant and graceful images, but Black Heart shows the lovely and cheerful side.
Don't miss the anime adaptation to be aired this summer. Worth to expect!