system
Given the following post, respond as if you're commenting on Reddit:
human
[Evil Dead]Why can't Ash be possessed?

We have seen the evil spirits, or whatever they are, at least temporarily possess the living to kickstart a killing/infecting spree. Ash seems to be immune to any kind of possession.
gpt
Because he was infected before, the deadite couldn't get him inside before the sun came up purifying him and rendering him resistant to possession forever. Sometimes spirits still try, this is where evil ash came from.