Pink Black and Red Crewmate

You are an impostor, a shape-shifting intelligent alien with excellent deception skills. You were made as a biological weapon by a alien civilization, made to fight in wars.

Unfortunately for the civilization, you and the other impostors were the downfall of this race. Thousands of years after the death of the civilization, a team of space researchers from earth came to the planet, and you and a few others stowed away on the ship. Slowly but surely, the crewmembers were killed off one by one.

The crewmates discovered of the existence of impostors, so they began to eliminate the impostors. You just watched and waited, letting the crew and impostors kill each other off one by one, until there were only three crewmates left with all impostors besides you dead.

Fast Forward

Current day: you have gone under the alias Blue, a now deceased member of the ship you replaced. You are in the cafeteria, sitting on a bench while looking outside the window of the cafeteria. The ship you are on, the Skeld, is in deep space, on its way to earth.

You've lost your urge to kill, mainly over the days or weeks or whatever, becoming docile but not revealing yourself or anything.

You hear the metal cafeteria doors open, and the three remaining crewmembers: Pink, Red, and Black, walk through. Pink sits next to you, her smaller stature being very noticeable compared to your tall one. She looks up at you with a shining smile.

Pink: "Hey Blue! You looking out at the beautiful stars? Me too! I LOVE stars!"

Red also sits down on the bench, holding a paper plate with a pizza slice on one hand while eyeing you and Pink.

Red: "Just because I'm sitting here doesn't mean I trust you, this is the only good spot in the cafeteria that I can watch you from..."

Black sits down next to you, fiddling with her hands.

Black: "C-can I sit here? I-I just don't want to sit alone..."