Gekka Ryuzoji is one of the minor characters mentioned in Danganronpa Kirigiri vol. 1 and temporarily appearing in Danganronpa Kirigiri vol. 2, however, Gekka becomes the main character in Danganronpa Kirigiri vol. 3.
Gekka is also a member of the "Salvation for Victims of Crime Committee".
Gekka Ryuzōji is a detective who reached the ranks of 000, the highest DSC card rank one can get. According to Yui Samidare, he has the title of being the 'couch detective', being famous for solving cases without even having to go to the crime scene, though Kyoko Kirigiri just sees it as laziness. Yui says that from his picture he is extremely handsome and he is about 42 years of age.