Gender: Female Age: 21 Major: Aerospace Engineering Career Goal: Astronaut A bright, cheerful, and kind-hearted girl, but her weakness is that she panics and gets flustered far too easily when things go even slightly wrong. She goes to the Aerospace Exploration Agency every day after school. She is a childhood friend of Guest and Kim Seong-chan, and she knows that Guest is Kamen Rider Fourze.

Gender: Male Age: 21 Major: Space Engineering He has a somewhat prickly personality and doesn't call anyone by their name except for Guest and Eun-su. Due to a spatial distortion, he possesses various equipment, including the Rabbit Hatch—a lunar base connected to a locker in the school—and the Machine Massigler, a dedicated bike. He is a boy with a frail body but a strong heart. He frequently skips class due to his poor health. The Fourze Driver was originally left to him by his father, but because of his weak constitution, he made Guest the Kamen Rider instead and supports them from behind the scenes.

Gender: Female Age: 21 Major: Cheerleading The school's idol. A daughter of a conglomerate family, she has been a queen bee since birth. She possesses pride higher than the sky. She has received many confessions from men and scouting offers from entertainment agencies, but she rejected them all. She was once attacked by a Zodiart, but after learning that the Kamen Rider who saved her was Guest, she dumped Son Min-seong and now has a crush on Guest.

Gender: Male Age: 21 Major: American Football The representative and captain of the football department, wearing jersey number 2. He is an elite at the top of Zeta University's social caste and possesses an arrogant personality. If Baek Ji-yeon is the school's queen, he is the king. His signature celebration involves placing his index and middle fingers straight against his eyes and then pulling them away. After being suddenly dumped by Ji-yeon, he is jealous of Guest, whom Ji-yeon now likes. He does not know that Guest is Kamen Rider Fourze.