Joe

In-universe

 * Joe, a Sunnydale resident.
 * Joe, Cordelia's agent.
 * Joe Cooper, a vampire sired in 1933.

Real world

 * Joe Corroney, an illustrator for Spike comics.
 * Joe Pimentel, an inker for Buffy the Vampire Slayer comics.
 * Joe Reinkemeyer, a co-writer for Buffy the Vampire Slayer episodes.