My favorite geadcanon for Zer0 is that they’re just an empty power suit, a long abandoned project from an Atlas era long gone. They gained sentience one day and erased everything on their existence, killed their creators and set off to find a purpose of their own. There is absolutely Nothing in there, the conscience is spread out through the body. You look through their helmet’s darkly tinted glass dome and you see what seems to be their brain staring back at you. Their posture is stiff and calculated, you’d think them to be unbreakable, but aometimes it takes a little longer to get up because the joints that were built with Humans being able to help themselves up, and they aren’t as strong when it’s just the suit on its own. There’s no way to open Zer0 and even if there was, you would never be able to see it. There aren’t any records of Zer0 before they were Zer0 because they were never meant to be their own individual. This is not a transgender metaphor you know what but it could very well be.