I hope this fits into the 'halloween' theme enough. Vaguely inspired by both the Doctor Who episode ("Who Turned Out the Lights?") and a short story (I think that's what it was, I don't really remember) where the space suit used the cosmonaut's body as fuel until it eventually ate him entirely.

Not much lore behind this skin, but I like to imagine it's a true undead instead of possession or robotics. Maybe it interacted with some sort of alien energy?