>>23554329
I'm guessing you mean the bird and not the mercenaries as those come in whatever color you want.
Aside from black they can sometimes be brown or gray, but even if you stick to black the feathers look kinda metallic and iridescent, on the uncommon colors that doesn't mean much, somewhat metallic brown with lighter shades of brown and somewhat metallic gray with lighter shades of gray but classic black gives you more interesting results as you get somewhat dark metallic shades of blue and purple (somewhat light even depending on the lighting, angle and the camera someone took the photo with), I'm not sure how'd you represent the iridescence in game, maybe there's some way to make a gradient effect but if that doesn't work guess you simply have more colors to play with anyways.