Kouta is a detective working within the same agency as colleagues Yumiko and Takuya. He possesses distinctive navy blue hair and light brown eyes. His standard outfit consists of a hooded suit paired with black pants and black shoes. Loyalty defines his personality, particularly in his dedication to fellow detective Yumiko. Together, they operate under Chief Kaibara, who vanished following the destruction of the city known as Lost. His name is rendered in katakana as コウタ (Kōta). When written with the kanji 康太, the name potentially combines the meanings "peace" (康) and "thick, big, great" (太).