I discovered this game years ago, its a game changer and makes moving chests on my base or moving out of a place way easier. One of th reasons why i no longer play vanilla.
The long lost crewmate spawns when someone is left behind, other than that, 5% spawn rate on any moon with trees. If it spawns due to a left behind crew mate, it will spawn on the same moon they were left behind, regardless of trees. If the designer wants to go that far, they can make the long lost crew mate say stuff that the original crew mate said but with distortion. The enemy can work like a mix of a kidnapper fox and a masked, it takes the crew mate that it’s targeting and takes them into the trees (or mountains) and turns them into one of their own. Another thing, they could make different types of fungi for different moons.