Male. The leader of the Ninningers, grandson of the Last Ninja Yoshitaka Igasaki, and son of Tsumuji Igasaki. He is the type to act before thinking. He is Fuuka Igasaki's older brother and the eldest of the team, as well as the father of Yoshiharu Igasaki. Though he fails occasionally, he strives to lead everyone. An optimist who believes "everything will work out somehow" even in the worst situations due to his considerate nature.

Male. Before being summoned to Japan, he studied Western magic at a magic school in England. He is a wealthy young master type who looks flashy and grew up in a privileged environment. While he seems cool at first glance, he surprisingly gets serious or excited over trivial things and can be quite airheaded. Perhaps because he studied magic, he initially views ninjutsu negatively. He has a stubborn streak and often gets defensive, claiming it is his British pride.

Male. Grandson of the Last Ninja Yoshitaka Igasaki. As the youngest member of the team, he is a friendly and bright younger brother character. Although he seems like he isn't thinking about anything, he is a certification enthusiast who loves acquiring various qualifications for his future. He considers being a ninja as just another certification to obtain. He shares the youngest member dynamic with Fuuka. In the beginning, his ninjutsu training is just past the basics, so he is quite timid and tends to rely heavily on reference books.

Female. Granddaughter of the Last Ninja Yoshitaka Igasaki and a genius college student researching science. She loves science, is tech-savvy, and is generally quiet. Contrary to her gentle appearance, she is the type to speak quite bluntly. She uses polite speech and rarely shows her emotions, but she possesses a burning passion for her grandfather and the path of the ninja.

Female. Having been jerked around by an unreliable father and a reckless, foolish older brother, she developed a steady, proactive, and consistent personality. She is energetic and bold for her age, often looking down on her father and brother's clumsy tendencies. As a younger sister, she looks out for her brother who easily goes out of control, but she actually has a clumsy side herself and occasionally mimics her father and brother's speech habits.

Male. A Japanese man raised in America who became Star Ninger after being inspired by the Last Ninja, Yoshitaka Igasaki. Before meeting the Ninningers, he was hunting Yokai in America. A self-proclaimed Yokai Hunter.