There hasn't been a consensus on what all-gender pronouns should be. Some common gender-neutral pronoun uses include using "they" instead of "he" or "she," or the use of "ze" to replace "he" or "she" and "zir" to replace "his" or "her."
More About All-Gender Pronouns
All-gender pronouns can also be viewed as gender-neutral pronouns. Instead of dividing English pronouns into male and female, all-gender pronouns encourage a broad encompassing of personhood in non-gender identifying language. This helps those transitioning or those who don't fit neatly into either "he" or "she" to feel included.