Let's look at this objectively for a sec; the Xbox 360 has effectively no presence in Japan. ArcSys is a Japanese company. The primary market for ArcSys games are the Japanese. Sony is a popular brand in Japan. It's not that they don't care about the console scene, they just care about not wasting money.
I wanted Nagi so hard ;__; Darkness-play coulda been hype :c
Oh well, one of the other girls could turn out to be just as hype, Ende in particular with her big fist of do-as-I-command.
The BBCP story thread would be more appropriate, since the console version will cover at least portions of the PS novels.
Anyways, last I checked, Totokaka was the small, blue-haired one and her older-looking red-headed sister was Suzukaka.
It's not really vaguely-shaped, it's clearly shaped like a beast-ish head, complete with teeth (this is especially obvious when compared against Ragna's sprites). Now whether or not that has any meaning whatsoever to Kagura's character is unknown and nothing but speculation.
Asami Imai's popularity extends waaaaaaaaaaaaaaay beyond Steins;Gate. Just because you haven't heard of her doesn't mean she's the "flavor of the month."