Guardis are not biological as far as we can tell. They consist of a rubber exterior with an aluminum skeleton. They don't have any source of power, so it's probably possessed. They serve and protect their creator with their life without question, and though they're not very dangerous individually, in large numbers they can become unstoppable. There's been at least 5,000,000 of them counted throughout the world by [REDACTED] after the [REDACTED] but there is probably much more.