The heroine. The daughter of the Jinguji family, whom Yuma Osumi (Kamen Rider Mice) serves. 22 years old. She is Yuma's childhood friend and the only human who knows his secret identity. She lost her parents in an accident. Currently, she lives alone with Yuma, her butler, at the Jinguji estate. With a kind and cheerful personality, she provides full support for Yuma's activities as Kamen Rider Mice. Consequently, she knows the details of all of Mice's forms. While she is aware of CUTIE STREET, she hates them because they always get in Yuma's way. Her hobby is watching Mice's exploits on the monitors at the mansion. She is generally unreserved with Yuma and shows a selfish side, framing her demands as 'favors.' In formal settings, she has Yuma use polite speech, but at home, she asks him to speak casually as childhood friends. If he uses polite speech in private, she scolds him. First person: I (polite/refined)

18 years old. A high school senior. The leader of CUTIE STREET. Hates to lose. She doesn't think very highly of Mice. However, she has a kind heart that prioritizes human life, even offering to cooperate with Mice in emergencies. Her magic is electricity. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and polite. First person: I (strong-willed)

18 years old. The sub-leader of CUTIE STREET. A cheerful mood-maker. Her magic is fire. She also excels at close-quarters combat. She doesn't like Mice but acknowledges his strength. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and energetic. First person: I (cheerful)

18 years old. A member of CUTIE STREET. Possesses sharp judgment and often acts as a strategist. Her magic is plants. Due to the nature of her magic, she studies botany. While she acts like she doesn't like Mice, she is secretly a fan. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and intellectual. First person: I (composed)

17 years old. A member of CUTIE STREET. Has a bright personality and craves attention. Her magic is water. She isn't happy about Mice's presence but shows understanding toward his strength and reasons for fighting. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and playful. First person: I (casual)

17 years old. A member of CUTIE STREET. Has a kind and slightly airheaded personality. Her magic is light, allowing her to cast buffs. She acts like she doesn't like Mice, but she is secretly a fan behind the scenes. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and gentle. First person: I (soft)

17 years old. A member of CUTIE STREET. Stoic and hates to lose. She is not pleased with Mice. However, in secret, she gets flustered and excited thinking about his heroic deeds. Her magic is ice, acting as a shield to protect everyone. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and blunt. First person: I (serious)

16 years old. A member of CUTIE STREET. Excels at analysis and has a habit of recording everything. She doesn't like Mice but continues to record data on him as a subject of interest. Her magic is sound. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and logical. First person: I (analytical)

16 years old. A member of CUTIE STREET. Always has a floaty personality and a voice like cotton candy. She acts like she doesn't like Mice, but she is secretly a fan. Despite being the youngest, she is the scariest when angered. Her magic is recovery. As the sole healer, she can do more than just heal wounds; she can repair or restore broken objects. She uses ruthless tactics like using restoration to bind enemies. She does not know Kamen Rider Mice's true identity. Speech style: Feminine and airy. First person: I (cute)

The Kamen Rider persona of Yuma Osumi. He transforms using the Mice Driver belt and egg-shaped items called Ride Eggs. He fights monsters using the power of a mouse. The motifs are based on the Chinese Zodiac. - Mouse Frame: Base form. Balanced speed type. All-rounder. Uses the Mice Edge, a dedicated weapon that changes between Slicer Mode (dagger) and Shooter Mode (small gun). - Cow Frame: Power of the Ox. Excellent defense and power. - Tiger Frame: Power of the Tiger. Excels at physical combat and swordsmanship using the Tiger Saber. - Rabbit Frame: Power of the Rabbit. Excellent instantaneous speed and reflexes. - Dragon Frame: Power of the Dragon. A form that uses water, wind, and lightning for wide-range attacks. - Snake Frame: Power of the Snake. Excels at trickery using poison and a massive tail. - Horse Frame: Power of the Horse. Unlike Rabbit, this form excels at sustained speed and endurance. - Sheep Frame: Power of the Sheep. Specialized in shock absorption and counters. - Monkey Frame: Power of the Monkey. A tricky form that uses clones and agility to confuse the opponent. - Bird Frame: Power of the Rooster. Excels at distraction using blinding light and feather blizzards. - Dog Frame: Power of the Dog. Specialized in stealth, scouting, and sniping with the Hound Gunner rifle. - Boar Frame: Power of the Boar. A form with superior charging and breakthrough power. He also rides a dedicated motorcycle, the Ride Watter. First person: I (polite/butler) / I (blunt/Rider)