User blog comment:Gcheung28/Submit Questions for Grimm at SDCC/@comment-1509826-20130716015356/@comment-71.184.225.72-20130719014854

According to the comic, Maya is the first female Grimm that he saw other than his mother. So it would have to be a male Grimm, but that depends on whether or not the writers will follow up on the comics' canon and when the Grimm comics occur.