Karasu Tengu is a person who wears a Knightmare giving him the power to manipulate wind, float and fly for short periods of time.
He has several holes throughout his body that act as vents for his powers and bears the same variation of the Black Knights insignia used by the unnamed individual who resembles Lelouch on his chest.
Andreas Weinberg describes him as someone who is "human, but not human at the same time".