Sean

In-universe

 * Sean, a student at Sunnydale High School.
 * Sean, a dealer of demons and owner of Naked Grains.
 * Sean Dwyer, a member of Sunnydale High School swim team.

Real world

 * Sean Astin, the director for the Angel episode "Soulless".
 * Sean Gunn, the actor who portrayed Lucas and Mars on Angel.
 * Sean Murray, a music composer for Buffy the Vampire Slayer.