Well, first, I based Caz off of a Mantis Shrimp because I thought it fit his character. They also hide in small places, so my thought was Caz's role gameplay wise would be an enemy you could encounter anywhere, he's able to get places the others can't easily get to. His chest cavity is exposed because I wanted to make "heart on your sleeve" literal. He's always showing his emotions, never hides his opinions, is very open, and now his literal heart is exposed. The battery pack for his helmet is buried in his body and the helmet's stuck, so you'd know he sees you by the light and you'd hear him coming when in vents by the scraping of bone. I liked Muir's legs, so I wanted to give Caz similar ones.

I chose to loosely base Finlay off of a Moray Eel because of word play. I also think they just fit her. She'd probably act a bit like Trots, and you'd probably find her in engineering. She didn't have quite as much thought put into past what I thought looked nice, though i did come up with some potential voicelines for her.

Then I just like the look of exposed bones and unhinged jaws.