Kei Uzuki
有月憬
Gender
Male
Age
27
About
Height: 179 cm
Uzuki, also known as Slur, is a killer seeking to overthrow the JAA. Roughly around the same time Tarou Sakamoto's bounty was put up, Uzuki murdered a quarter of the assassin industry. The Order deemed him "X" as he leaves a large red 'X' at the scene of his crimes.
In chapter 104 ~!Database reveals Uzuki's full name and part of his past.!~
(Source: Sakamoto Days Wiki)