Bob is a dentist that went insane and traps his customers into the building. He appears to be a grey-haired man with glowing red eyes, yellow teeth (which implies he isn't the best dentist out there, but the most evil... Sure he is) and goggles on his head. He carries a giant toothbrush as a weapon. He has two little pets that look like rusted dentures with a single eye similar to his own. He's evil and chaotic, giving off mad-scientist vibes and can be obsessive and aggressive at times.