"I'm a Kaijin, just like you guys. I'm a Kaijin feeling the same kind of anger! If we stay quiet, this hate will continue and we will be crushed. That's why you should be even angrier! This world is not just for humans. This is also our world! So we have no choice but to fight."

"Humans have extinguished inferior species before, and by suceeding in such acts they have thrived. We should learn from them."

Nobuhiko Akizuki

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Nobuhiko Akizuki (秋月 信彦, Akizuki Nobuhiko) was the deuteragonist of Kamen Rider Black Sun. As a child, he was transformed into the Silver Locust Kaijin (銀殿様飛蝗怪人, Gin Tonosama Batta Kaijin) using one of the Kingstones. He was an intended candidate to succeed the Creation King, along with Kotaro Minami. In 1972, he and Minami joined Gorgom, but Nobuhiko was imprisoned by the Three Priests after the group split. After escaping in the present, he gathers like-minded Kaijin under him to kill the Creation King and overthrows Gorgom, evolving into Kamen Rider Shadowmoon (仮面ライダーSHADOWMOONシャドームーン, Kamen Raidā Shadōmūn).

Consumed with guilt over the failure of his mission on the Gorgom Party headquarters, coupled with witnessing the murder of Shunsuke Komatsu, Nobuhiko was overcome with hatred towards humanity, which allowed him to further evolve into a sleeker version of his Kaijin form. Unlike his original Kaijin form, Nobuhiko performs a transformation pose in order to transform into his evolved state, which is a mirrored version of Kotaro's pose.

While Shadowmoon's eyes usually appear to be black in this form, they are able to illuminate with a bright green light in certain moments.

"Kaijins should be gone from this world. That is enough for me."

"How dare you turn Aoi into a Kaijin?! I will never forgive you!"

Kotaro Minami

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Kotaro Minami (南 光太郎, Minami Kōtarō) is the main protagonist of Kamen Rider Black Sun. As a child, he was transformed into the Black Locust Kaijin (黒殿様飛蝗怪人, Kuro Tonosama Batta Kaijin) using one of the Kingstones. He was an intended candidate to succeed the Creation King, along with Nobuhiko Akizuki. In 1972, he and Nobuhiko joined Gorgom, but Kotaro later defected after the group split. In the present, he protects Aoi Izumi from Gorgom and evolves into Kamen Rider Black Sun (仮面ライダーBLACKブラック SUNサン, Kamen Raidā Burakku San).

After realizing that Aoi Izumi had been turned into a Kaijin, the intense emotions he felt during that moment enabled Kotaro to further evolve into a sleeker version of his Kaijin form. Unlike his original Kaijin form, Kotaro performs a transformation pose in order to transform into his evolved state.

Kotaro's metamorphosis into this new form has drastically increased his strength and speed, allowing him to overwhelm the Creation King whereas his Black Locust Kaijin form was almost effortlessly thrown aside by the Progenitor Kaijin's psionics and had his leg crushed. Furthermore, he is also able to channel the Sun Driver's energy to further enhance his physical strength for a finishing attack.

While Black Sun's eyes usually appear to be black in this form, they are able to illuminate with a bright red light in certain moments.

During Kotaro's rejuvenation process after taking a dose of Heat Heaven, Aoi uses her blood to draw out a symbol on his left chest, which is later burnt into his Kaijin form as a white-colored emblem.

#KamenRider