The Ulquiorra Mask was created as for Comicon as a cosplay mask. The costume, which included this mask was met with great approval by the participants at Comicon.
Ulquiorra is a character who is callous, cold and dispassionate. He is indifferent and above others. He seems willing at any moment to harm his enemies and his friends if they get in his way. All are expendable in the end.
This costume mask is a great way to transform and play. If a cold heart and a mind that believes emotions cannot exist since they cannot be seen is what you are after, then this is a mask for you.