This is my siblings, Remorse (top) and Demise (bottom) and basically the concept of the Nightrunner specie in ifus ifus's comic :3

As you see, the top is a male, and has darker color and bottom is female with a more slender build, lighter color, and slightly bigger ears. The Males' mane also goes all the way down its back.

As for their expose bones and horns, that is how their skeleton would look, but noone can preserve them, they vanish when they pass away. Their eyes and mouth always glow too. It's their 'inner aura' and when they die, so does the light.

I love these two to death and cant wait to draw more of them <3