In game I've never seen them called anything accept attendants, but I've always thought of them as hitmen lol. There's really two sides to every story. Just because a race isn't SUPPOSED to be evil, doesn't mean that some of them aren't. Even if they aren't the MAIN race that make up the Dark Interlopers, there could be some Sheikah among their ranks. Since they dwell in shadow, they are often close to evil. This could have made the weaker-willed ones easy to corrupt in some fashion.