The first zero-g Vocaloid on the version 2 system came shortly after the Kagamine release by Crypton.  This English-speaking Vocaloid boasted a clearer voice than her predecessors.  Prima's voice is used more than the zero-g version one Vocaloids, and can also serve as a good English software interface for the Japanese vocal libraries to be installed on top of.  Prima has been classified as a woman with long black hair, however her established canon is nearly nonexistent except for the Return to Zero saga.