I'm not saying its aliens... but Aliens.
This grouping is more about classifying #aliens by motivation not description
The #Fallen - those who are stranded here rather than through some choice.
The #Dodgers - those who are avoiding legal problems out in the wider universe
The #Missionaries - Aliens who are here for a mission specific reason.
#Immigrants - those who seek some sort of legal recognition
#Limboans - “nothing to do no where to go.” Essentially tourists no matter how long they stay.