anybody / anyone: agreement
Which pronoun to use after anybody and anyone.
Anybody and anyone are singular. The pronoun that follows those words is they, them, or their: Anyone who wants a copy should leave their name. He or she is acceptable. Do not use generic he. That use is outdated. Do not use anyone are.
Examples
Use Anyone who is ready may take their seat.
Use Anyone who is ready may take his or her seat.
Avoid Anyone who is ready may take his seat.
Avoid Anyone are ready.
The same agreement holds after everybody, everyone, somebody, someone, nobody, and no one.