
Katya has to be this as well, given she survived a Xenomorph infestation.
Action Girl: Corporal Tequila, your primary supporting character in the Marine campaign.
Absurdly Spacious Sewer: The massive sewer system beneath the colony, which you fight through in both the Marine and Alien campaigns. Enemies are more resilient, but the player is only in real danger if faced with multiple adversaries, especially in the Alien campaign due to auto healing. They will also still go out alone, and while the game does try to mitigate this by creating more obstacles, they can easily be avoided.
Artificial Stupidity: Even on higher difficulties, the Marines, especially in the Alien campaign, will still easily fall for traps in the Alien and Predator campaigns.