Kuro-tan

Looking from the outside, you might see her as a weird gloomy girl who keeps to herself, but that's not quite the truth. She indeed keeps to herself, but not because of her personality. Rather, it's her physiology that makes her feel the need to hide herself. When her emotions get excited, her body starts to transform in various places, such as growing a scaly tail, growing spines sticking out of her back, scaly hands with claws, etc. Having been heartbroken and ostracized before because of this, she tries to keep to herself. This secluded lifestyle will soon change. She is a fan of heavy-metal and sweets.