Sometimes it is preferable to leave a person's gender undisclosed and some people do not fall into the usual two gender categories. This requires some adaptations in languages that indicate gender in nouns or pronouns. In English one can use the plural "they" in the singular so as to avoid choosing between "he" and "she". In Swedish a new neutral pronoun "hen" has been introduced in addition to the masculine "han" and the feminine "hon".
I would like to know if there is a neutral choice in Latin. Using neuter (e.g. id instead of is or ea) is one option, but it makes the person in question sound inanimate. In case of a person of unknown gender Latin uses masculine, but this is not really a good option for this purpose: If I speak about a specific person, then using a masculine pronoun indicates that the person is male, whereas I wanted to make no statement about their gender.
Which Latin pronoun(s) could I use to refer to people of unspecified gender? If you suggest a new pronoun, where has it been used and how can I decline it? (I am not asking you to come up with new pronouns. I am asking if there are attested pronoun suggestions for this purpose in the Latin literature.) If you suggest using neuter pronouns for people in this case, can you provide use examples to show that this has really been done before?
Let me stress that I am looking for pronouns in the case of a specific person. As I wrote in a comment below Cerberus' answer about the neutrality of masculine pronouns: It is important that the person is specified. If someone says "If someone comes to my office, I will sing him a song", I understand that it doesn't have to be a man. But if I hear "My spouse has his own business", I assume the spouse is male.