Hir, themself; gender-neutral third-person singular object of a verb or preposition that also appears as the subject, coordinate with gendered himself and herself.
Sie; an intensive repetition of a gender-neutral subject, often used to indicate exclusiveness of that person as the only satisfier of a predicate.
The reflexive case of they, the third-person singular personal pronoun. The single person previously mentioned, as the object of a verb or following a preposition (also used for emphasis).
The reflexive case of they, the third-person plural personal pronoun. The group of people, animals, or objects previously mentioned, as the object of a verb or following a preposition (also used for emphasis).