Is there a gender neutral pronoun in mandarin?
Nowadays, it's common for authors use the English letters "TA" to avoid indicating a gender.  For example:


  TA是什么性格的人[src]
  Literal translation: They are what personality person?
  Translation: What is their personality?


Many more examples are found in Baidu News by searching for "TA".

See also: What would a non-binary tā （他／她） look like?