variable pronouns

Hi, all,

In Steven Pinker's "The Language Instinct," a read that some languages have
distinct forms for pronouns that stand for variables.   So if our variable
pronoun = X, then we'd have sentences like this:   "Everyone returned to X's
seat" for "Everyone returned to his/their seat."

Can anyone name any languages that have such pronouns?

Can anyone describe the variable pronouns that occur in their own natlangs
or conlangs?

Thanks,

Jim