They also keep her from getting sunburned in her desert combat bikini top.

Transcript:
Comic 'Metal Gear Or Something'

Panel 1
Snake: How did you make your face change color?!
Quiet: [Chromatophors. I have octopus genes that let me change skin color]
Snake: Chromatophors!? Hunh. That could come in handy. But you can't talk?
Quiet: [Nope]

Panel 2
Snake: The perfect woman! [grabby hands]

Panel 3
[Snake is sprayed in the face with ink]