I'm guessing they are similar to vampires.
<Kazz> Do vampires have anuses? Cause that's why I wouldn't let this kid invade a vampire's anus in this RPG, right, I was GMing, and his character was an Anus Shade, with the power to possess and control the anuses of people and animals.. and I figured that vampires don't have anuses.
<Zaratustra> a vampire's anus is present, but non-working.
<Zaratustra> like a network card without the appropriate driver.
<Kazz> Wow. You're the biggest dork on Earth.
<Sharkey> And you're DMing an rpg with Anus Shades.