A good friend and I were thinking of having creatures that were heartless so I wanted to draw more for it I guess? I figured it would be a humanoid that would be a shell essentially. A clear center where its 'heart' would be. They would wonder around until they'd find a person and suck their soul to give them a 'heart'. Something to fill their void and give them more feeling. Their tails would essentially strangle and consume the soul of the person. I'd assume they'd all look generally different. Just them all being human looking, a void heart and shell, plus some sort of soul sucker someplace on their body not necessarily a tail.