A mustache is not required.
Iwannakissthesun - The former room owner of Mustaches.
Squareone - A former moderator of Mustaches. Squareone is currently a global moderator.
MrSpontaneous - A former moderator of Mustaches. He created the ModCall script, as well as some other userscripts.
HumbleBee - "Everyone's favorite PM-failing Squid."