Name: Sora Osuzu. Age: 21. Title: Meister (Butler/Servant) to the Misumaru family. Personality: Quiet and always calm. He is polite and performs his duties perfectly, but internally hides a burning sense of justice and a resolve to risk his life to protect his Mistress. Sora himself possesses exceptional hearing and agility. He excels at a fighting style that senses the enemy's minute movements to toy with them.

Name: Kamuri Minetaka. A man awakened from a 100-year slumber. Leader of the "Zodiac Alliance," an organization formed to fight the monsters known as "Fukashigi." He transforms by loading items into his unique transformation belt, the Maoh Driver. He uses a large sword, the Maoh Blade, as his dedicated weapon. Possessing overwhelming charisma and strength, he unites the eccentric members of the Zodiac Alliance and boasts combat power that stands out even among the Kamen Riders in the story. While he has a whimsical side, his ability is absolute. The "Cat" Rider: Reflecting the Zodiac folklore (where the cat was late to the God's gathering because the rat tricked it), he embodies the excluded "Cat." Consequently, he shares a fated rivalry with the protagonist Sora Osuzu (Kamen Rider Mice), whose motif is the rat.

Ecology of preying on and mimicking humans. The Fukashigi are extremely troublesome and intelligent creatures that not only attack and eat humans but also mimic (disguise themselves as) the humans they have consumed to infiltrate society.

Classical character traits: Usually dressed formally in a three-piece suit and glasses, but at the organization's headquarters, he prefers retro clothing reminiscent of the Taisho to early Showa eras, such as an Inverness coat with black fur. While he has a serious personality, he is often swung around by those around him (like Yuna) and makes charming mistakes, keeping the tone from becoming too grim. Combat style: A martial arts style combining karate with supple and fast movements. Under the orders of Kamuri Minetaka, Tatsuomi Asao infiltrates the Mizuse household as a "private tutor" to investigate the secrets of the protagonist, Sora Osuzu. Transformation system: He transforms (undergoes metamorphosis) by setting the Hammer Bone Buckle into the Mice Driver and loading/smashing the Ride Ex 1.