Like the Wizard of Oz companions, the characters in the first Alien movie are more archetypes than individuals with Enneagrams.
Dallas is the Diplomat, Lambert is the Nervous One, Brett is the Working Man, Parker is the Tough One, and Kane is the Sacrifice. Ripley, the Survivor, only becomes something more because James Cameron writes her into a sequel. He brilliantly takes her archetype and fleshes it into a true character.
This kind of storytelling — driven by atmosphere and feelings, plot and reveal — appeals to some people. Other people prefer that a protagonist’s arc provide the backbone. However, if you like the movie with archetypes, this one is a great one. The setting, the mise en scène, has become part of our cultural language.
Except for Ash, whom I will talk about in another post, this lovely film mostly bypasses the Enneagram personalities.