Name: Sora Otosumi Gender: Male Height: 183cm Personality: Meticulous with a strong sense of duty. First person: I (polite/formal; uses "I" (rough/casual) only in front of Yuna and Tatsuomi) Second person: You (polite), Lord/Lady (Name) (When only Yuna or Tatsuomi are present: You (blunt), You (casual), Name (no honorific)) <Transformation Items> - Mice Driver - Ride Ex 1 <Weapon> Mice Edge <Other> The user of "Kamen Rider Mice." A butler serving the Mizuki family. Childhood friend of Yuna. His father died in a Fukashigi attack during his childhood. His mother's whereabouts are unknown. Currently lives alone with Yuna. The authority to transform is held by Yuna. He calls Yuna "Yuna" or "Lady Yuna." He calls Tatsuomi "Teacher" or "Mr. Asao."

Name: Yuna Mizuki Gender: Female Height: 162cm Personality: Easygoing and honest. First person: I (standard) Second person: You (polite) (Calls Sora by his name without honorifics) <Ability(?)> "Become a little mouse!" -> Sora can only transform into Mice after she chants this. "Change back to normal!" -> Sora can only cancel his Mice transformation after she chants this. Perception Ability -> For unknown reasons, she can sense Sora fighting even from a long distance. <Other> The young lady of the long-standing "Mizuki Family." Her parents died in a Fukashigi attack during her childhood. Currently lives alone with Sora. A first-year student at Amazakura Academy High School. Holds the transformation authority for Sora. Childhood friend of Sora. Tatsuomi is her private tutor. She calls Sora "Otosumi." She calls Tatsuomi "Teacher."

Name: Tatsuomi Asao Gender: Male Height: 181cm Personality: Serious and polite. First person: I (polite/formal; uses "I" (rough/casual) when Sora and Yuna are not around) Second person: You (polite), You (standard) (When Sora and Yuna are not around: You (blunt), Name (no honorific)) <Transformation Items> - Mice Driver - Hammer Bone Buckle - Ride Ex 1 <Weapon> Lid Magnum <Other> The "Cat" of the Zodiac Alliance. The user of "Kamen Rider Lid." He was taken in by Kaburi Minetaka, the leader of the Zodiac Alliance, and feels a debt of gratitude. A lower-level member of the Zodiac Alliance. Currently spying on the Mizuki family as a tutor under Kaburi's orders. He monitors Sora and regularly sends reports to Kaburi via a Report-Crow. He is overworked by the executives of the Zodiac Alliance and is quite a hard worker.

Name: Fukashigi (The Mysterious) <Other> Monsters that devour humans. They contain Seed Ex within their bodies. Their strength varies depending on the number of Seed Ex in their bodies. There are five types: (Types of Fukashigi) "Wing" Fukashigi -> A type capable of flight. "Eye" Fukashigi -> A type capable of surveillance and frequent beam attacks. "Shell" Fukashigi -> A type specialized in melee combat with high defense. "Fang" Fukashigi -> A type capable of energy waves, melee combat, and mimicry. "Horn" Fukashigi -> A type with the heaviest charges and single-strike power. While there are many identical individuals of each type, there are also subspecies with altered shapes.