Antagonist Idea - Invasion of the Body Snatchers

[Newt King]

I feel like they shouldn't be too hard to discover if you're paying attention, but that on the surface they should appear normal. Mainly because of situations like getting killed by a coworker due to unlucky spawning and because I think having a situation in which a few humans among a station of many snatchers have to avoid being targeted by pretending to be aliens would be interesting. That said I think that should only apply to base appearances, if you have a dude who bleeds yellow sap instead of blood or has some very specific and odd limitations it should not be too hard for an observant human to figure out what you are, but if you have a green dude with leaf hair it kinda fucks with the slow, stealth element.