Karasu is a tall and lean young man with spiky dark purple hair and a mole under his left eye. He also has blue eyes. Karasu tends to look down on people he finds "mediocre". He is wary of his surroundings and is able to control and produce chemical reactions with those around him. He is intelligent but has a sharp tongue and never misses a chance to insult someone, whether friend or foe. He has his own rules that he forces upon others to make matches go as planned.