system
Given the following post, respond as if you're commenting on Reddit:
human
[Destiny] Are Guardians actually undead?

There's an idea going around that Guardians aren't really people, they're just corpses animated by the Light. Even in the game, you'll get characters saying things like this (the last strike I played featured the Fanatic saying "Hello, dead thing". But earlier in the vanilla campaign, the Light was taken away but none of the Guardians died from losing it. Sure outside forces then killed a lot of them and hey couldn't be brought back, but losing the Light itself didn't seem to hurt anyone.

So are Guardians really just zombies with superpowers, or is everyone just being facetious?
gpt
Yes.  Guardians are an unstoppable army of immortal soldiers in thrall to an inscrutable orb.  An orb which we know very little about aside from this;  every other known race is willing to chase it across the galaxy to kill it.