Sentence:  When we rendezvous shortly thereafter, I learn that the box office is being manned, if that's the right word, by an odd-looking grizzled entity unknown to my wife but whom I infer from her description (and soon after confirm) to be the <WSD>genderfree</WSD> or ambigendered "Ditsy" from Maintenance, [...] 
Meaning of the word marked with <WSD> tags:  Agender, being neither male nor female nor any third gender.