video;
Well... somehow, I feel that if Suzumiya-san was here, you would have known of her, at least. [She isn't the sort of person to keep a low profile.]
As for the others, though....Nagato-san has short, gray-ish hair, and she's always reading. Koizumi-san is never seen without a smile on his lips, is tall, and quite handsome with light brown hair, and bangs that cut across his face. And Kyon-kun has a very casual style of clothing, short brown hair, and is average in height.