Karasu is a tall, slender demon male, with his ten-foot teammate Toguro dwarfing him by only a few inches. He resembles a young, Japanese adult male, having very long, straight, jet-black hair and violet eyes with pointy eyelids. Some of his hair bangs are messily arched above his head and on his face. Karasu is slightly flamboyant, as he wears a long, wavy black coat with a red inside, which appears as if it's flying while he is running or jumping, since the jacket mirrors a pair of bat wings. On the bottom half of his face lies a metallic mask, with a couple strands of tape to help keep the mask on, eight breathing holes and a pair of horizontal triangular lenses akin to tiny reading glasses.