Kohtaro Minami

Kotaro Minami is the main character of Kamen Rider BLACK and Kamen Rider BLACK RX. He has appeared as the title character in both series. In Kamen Rider Decade there are two Kotaro Minamis that are independently BLACK and RX.

History
Kotaro was born on the day of a solar eclipse along with his stepbrother Nobuhiko Akizuki. The Gorgom noticed this, both brothers were heirs to their leader's throne. Once the two were of age, they were captured by the Gorgom and were infused with Kingstones, Kotaro was infused with the Stone of the Sun to become Century King Black Sun. However before the final brainwashing, Kotaro's legal guardian and Nobuhiko's father, Soichiro Akizuki interrupted the final stage with Kotaro barely escaping.

Soichiro reveals to Kotaro that his real parents were killed by the Gorgom when he was a baby, before he himself was killed by five of Gorgom's Spider Mutants. Kotaro transformed and after defeating the mutants took the identity Kamen Rider BLACK to fight Gorgom. As BLACK, Kotaro gains friends from Nobuhiko's family as well as a friendly Gorgom mutant. Eventually Kotaro reunites with Nobuhiko; however, Nobuhiko was converted into the perfected Century King, Shadow Moon. In their fight, BLACK was killed and his family had to evacuate from Gorgom's reign over Japan. Eventually BLACK was resurrected and fought his way through hoards of monsters until fighting Shadow Moon and presumably killing him. Using the Satan Sabre used by Shadow Moon, BLACK fought against the Creation King of Gorgom and destroys him. With the Gorgom defeated, Kotaro visits the Capitola bar before leaving for unknown parts.

Half a year after the defeat of Gorgom, Kotaro is left homeless until he is adopted into the Sahara family. He became a helicopter pilot for his new family's business due to their connections, beginning a new life for himself. Unfortunately, five years later Kotaro was abducted into the Crisis Empire mothership. The empire was aware of his identity as BLACK and gave him an offer to join them. Kotaro refused and fought back but was incapacitated with the Kingsteon damaged. He was ejected into space floating aimlessly until the sun's radiation altered his Kingsone. When his pod entered Earth's atmosphere, Kotaro miraculously survived and had gained new power. His rider form evolved into Kamen Rider BLACK RX. With his new form and power he fought against the Crisis Empire.