Ring leader of the illegal races in Tokyo and a racer, Aiku cover his traces very well that the police have a hard time pinning his locations and races. Aiku owns an underground gambling den. He is a womanizer and flirty to who he finds attractive. Aiku is a tall man with shaggy brown hair with green ends and light facial hair. Aiku possesses a rare genetic condition called heterochromia iridum, so his left eye is green and his right eye is purple. Aiku is 190 cm (6' 3").