Movie
Description
Twenty, alias Kai Nijuuri, maintains dual lives. Publicly, he is Kai Nijuuri, a teacher at Holmes Detective Academy. Secretly, he serves as Twenty, a core operative within the Gentlemen Thief Empire and a member of the Three Cards unit under Lady Arsene.

Physically, he is a 22-year-old male with a slim build, blond hair, and blue eyes, standing 174cm tall and weighing 57kg. His birthday is July 7 and his blood type is B. A recurring comedic trait involves his nipples becoming erect when excited or aroused, frequently during heists or confrontations, serving as a source of humor.

His personality exhibits extreme narcissism. He carries a bolster pillow featuring his own image for comfort and often strips during operations to demand attention, convinced of his body's inherent allure. This self-obsession extends to his teaching role, where students frequently ignore him. He is also characterized as perverted and immoral, employing charm and theatrics to unsettle opponents.

Twenty's primary ability is his "Toy," granting perfect disguise capabilities for seamless infiltration. He is also a skilled magician proficient in card-based attacks, gadget manipulation, and piloting flying machines. His thief alias and civilian name derive from Edogawa Rampo's literary character "The Fiend with Twenty Faces" (Nijuu Mensou).

Within the Thieves' Empire, he acts as Arsene's "left hand," specializing in deception and diversion. His undercover teaching role facilitates intelligence gathering for the Empire, though his flamboyant antics risk exposure.

In the film *Gekijōban Tantei Opera Milky Holmes: Gyakushū no Milky Holmes*, Twenty participates in the Thieves' Empire's attack during Milky Holmes' study tour, triggering a three-way battle involving Genius 4. Lightning strikes nullify Milky Holmes' Toys during the conflict.

Across media, his narrative functions as both a comedic antagonist and a tactical threat, balancing traits like compulsive stripping with genuine competence in thievery and disguise.