I'm a big fan of the one with purple hair, enormous elliptical eyes, a dead blank spot in the middle of her face, and breasts that don't even vaguely resemble actual breasts. I like the horrifying nightmare creature.
Super Sonico for me! She is the one with the long pink hair, headphones, striped bikini, and (in this artist's depiction) zettai ryoukai. She is the corporate mascot for a computer-software-and-musical-festival company, filling a role in Japanese society somewhere between Hatsune Miku and the Woodstock Dove. I believe I brought her up last week, while we were discussing which anime girls we'd most like to get vored by.
I wouldn't go so far as to say she is waifu material (I am a fan of pink hair, but I GREATLY prefer my pink-hair anime-girls to sport short bobs and/or twintails), yet she is the most interesting character of the ones I recognize, and it sure was nice of Nyanners to include her.