Also, in the same manner as many manga artists today, Kurumada employs the revered Osamu Tezuka's Star System manga technique, which is essentially resorting to the use of a stable cast of characters in his various works (characters keep the same appearance and personality, but sometimes the author gives them new personalities and different roles than in previous works). Because of this, the main characters of his works most of the time bear a resemblance to Takane Ryūji, the protagonist of "Ring ni Kakero". The main characters of his subsequent works have almost the same appearance and personality of Ryūji, specifically Jingi Kikukawa ("Otoko Zaka"), Kojirō ("Fūma no Kojirō"), Seiya ("Saint Seiya"), Teppei Takamiya ("B't X"), Shō ("Silent Knight Shō"), Aoi Tendō ("Aoi Tori no Shinwa"), Rindō Kenzaki ("Ring ni Kakero 2"), among others.