What is known is that Kuroniji can fly at great speeds, communicates through gestures, and appears to be fairly intelligent. He is roughly 12 feet long with a snakelike body covered in fine black scales tipped with fur, a gray and white mane and tail, white eyes and a long, exceedingly sharp horn. He does not have eyelids and therefore does not blink.

He also likes eating meat.

He imprinted on Snapdragon when she accidentally let him out of a containment tank in Ven’s lab, when she was… returning a wandering blitten.