Brain in Jar Character from the first trailer Spoiler possibly.

[caffeine4671]

There's a monster/character name Aker who's motivations are insanity and odd religious ferver[...]

As I understood it, every monster in the game is an existing crew member or brain scan. The game explicitly tells us only about Aker and his 3 Proxies, but the first (Worker), second (Catherine calls him "Brute") and the rest monsters didn't appear out of thin air. It just takes some thinking to connect the dots. I'm lazy.

That's one of the reasons why I liked the enemy and note placement in this game vs a machine for pigs. Just the right amount of difficulty and lived-in feel. And the monsters made sense relative to the location, they didn't cheat-spawn. Or at least, it didn't seem that way.