Mizuki Kamijo is one of the central characters in the anime Cybuster. She is a young woman who, alongside her childhood friend Ken Ando, joins the organization known as DC (Divine Crusaders). Her father is a mechanic working for DC, and her older brother Junichi Kamijo, who was transported to the parallel world of La Gias as a child, later reappears under the name Masaki. Mizuki becomes a recruit pilot for RT mecha, the organization’s combat machines.

In terms of personality, Mizuki is described as hot-headed and belligerent, often getting into arguments with Ken, yet she is also notably more level-headed than he is in many situations. She is courageous, intelligent, and determined, with a strong sense of suspicion when she encounters irregularities. Early in the story, she uncovers a black box on a trash site and becomes suspicious when the data on it is deleted from the computer, prompting her to investigate DC’s true motives. Her motivations center on uncovering the truth behind DC’s experiments and protecting her friends and the world from the threats posed by black holes and the invasion from La Gias.

Mizuki’s role in the story evolves from a fresh recruit into a key pilot. As the series progresses, she is granted control over the Machine God Armor of fire, known as Jaifer, which becomes her primary mecha. She fights alongside Ken and other allies against the forces of DC and the mysteries of La Gias. Her key relationships include the constant bickering yet deep bond with Ken Ando, her strained but ultimately heartfelt connection with her brother Masaki, and her father’s supportive presence. Throughout the series, Mizuki undergoes development as she matures from a headstrong newcomer into a reliable and skilled pilot, learning to trust her instincts and work with her team. Her notable abilities include her piloting skills, her analytical mind, and her eventual mastery of the Jaifer mecha, which allows her to contribute significantly to the battles that determine the fate of both Earth and La Gias.