The Sexta Espada who has an insatiable lust for power, Grimmjow Jaegerjaquez is disrespectful and violent, often abandoning what little respect he has for Aizen when he is out of earshot. He is overly confident in his abilities, believing he is equal to or even stronger than Ulquiorra Schiffer, the 4th Espada.
So he doesn’t have a hollow mask, but you have to admit, this is a pretty convincing cosplay. His I.D. is from Sakura Con 2008, but it’s too bad the picture’s too blurry to tell what his name is. Thanks to Marilyn for sending this in!