Also, Alien seems like it ought not to be on the list, but maybe...
See, it stands out on the list like a sore thumb, but:

The Faculty is absolutely a genre staple.
Though, The Faculty isn't about aliens, it's about people infected with a space virus.
There are a couple other movies about how sexual tension gets even messier when a shape-changing alien space virus is involved, but I forget what they are, at the moment.
I think Alien might work if it were either about being in control of an inhuman swarm (Hive Queen, Spider, Spawn, Spawn Lord, etc), or was about being touched by the darkness of space (Abducted, Infected, Star-Touched, Celestial, Voidling).
Thoughts?
Agree that some things on the list had too much cross-over. If you have Demon, you don't need Possessed. Ghost and Wraith are the same thing. So on. I was just brainstorming.
With Lich, I was going for animated-beyond-death. Lich, Ghoul, Wraith. Basically, a mummy/skeleton/zombie that rocks the anorexic chic look, with stark white skin. What to call this? Why to include this?