Daisen Kokoriki, also known as Kokoriki Daisen, works as a guard assigned to Nanba Prison's Building 5, marked by his dark green armband. His appearance is distinctive: standing 165 cm tall with tanned skin and freckled cheeks, he sports vibrant pink hair featuring hot pink and white streaks. This hair is styled to cover his right eye and partially tied in a ponytail secured with a bead behind his ear. His soft pink eyes are often accentuated with pink makeup, complementing his painted pink nails. His uniform consists of an open-collared black suit, a pink belt, and black boots with pink soles.

Confident and self-assured, Kokoriki frequently believes himself correct. He exhibits a playful and sassy demeanor, readily teasing fellow guards and inmates. While generally more laid-back than his brothers Youriki and Rokuriki, with whom he works in Building 5 maintaining order and managing training, he takes combat seriously and enjoys sparring. He lacks common sense but understands social hierarchies. During breaks, he often listens to music using earbuds and has a noted preference for sweet foods, especially strawberry ice cream.

The name "Kokoriki" originates from the Japanese kanji "koko" (九) meaning "nine" and "riki" (力) meaning "power," referencing the "Immortal of Tiger Power" from the Chinese novel *Journey to the West*. Trivia highlights his favorite strawberry ice cream flavor and mentions tendencies toward sleep deprivation and energetic behavior in non-canonical contexts. Official sources lack explicit details about his background, origins, personal history, transformative experiences, significant plot-driven developments, character arcs, or narrative contributions across the series, films, or OVAs.