The Fiend with Twenty Faces

The Fiend with Twenty Faces
Kogoro Akechi/The Boy Detectives Club character
First appearance	The Fiend with Twenty Faces
Created by	Edogawa Rampo
Information
Aliases	Heikichi Endo (遠藤平吉?) (real name)

"The Fiend with Twenty Faces" (Japanese: 怪人二十面相^?, Hepburn: Kaijin Nijū Mensō) is a fictional character who serves as a recurring antagonist for Kogorō Akechi in Edogawa Rampo's mystery fiction. A gentleman thief and master of disguise, he is considered Akechi's archenemy or most famous adversary.

He makes his first appearance in the The Fiend with Twenty Faces published in 1936, which was the first installment of Rampo's "The Boy Detectives Club" series. The titular antagonist threatens Tokyo, but with the country's greatest detective Kogorō Akechi away on overseas business, it is up to his 10-year old assistant Kobayashi Yoshio and the Boy Detectives Club to save the day.

The Fiend with Twenty Faces has appeared in other media and served as inspiration for other works, including the two novels Kaijin Nijū Mensō Den (怪人二十面相・伝^?) by Sō Kitamura and its film adaptation, the manga series Man of Many Faces by Clamp and Nijū Mensō no Musume by Shinji Ohara, and anime Trickster in which was voiced by Japanese singer-songwriter Gackt.

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Wikipedia