Rokusuke Kōenji begins in Class D after the school system flags his extreme egotism and refusal to cooperate. His affluent family finances his lifestyle, nullifying any motivation to earn points for class advancement. With shoulder-length blonde hair, maroon-gradient eyes, and a tall, athletic build, he stands out while wearing the standard uniform. His profound narcissism manifests in constant self-admiration—declaring himself "the pinnacle of beauty" while gazing at reflections—and a superiority complex rooted in family status. He exhibits consistent selfishness, refusing bus seats to the elderly and abandoning his class during a survival test, incurring a 30-point penalty he justified as illness recovery without remorse. He assigns derisive nicknames like "Pretty Girl" to Kikyō Kushida and "Elevator Boy" to Kiyotaka Ayanokōji, openly dismissing peers as irritants or tools. Despite this, he once assisted Mei Yuki after she fell, though coupled with contempt for Yōsuke Hirata’s role in the incident. Academically skilled, he passes exams without external aid. Honami Ichinose recognizes his latent abilities as a significant threat, though his uncooperativity limits his influence. His physical prowess approaches world-class swimming speeds (2.153 m/s), and he navigates forests acrobatically by swinging between trees. He effortlessly blocked a punch from Ken Sudō—renowned for athletic strength—and hunted a wild boar during an exam. He also deduces hidden truths with sharp intuition, identifying Ayanokōji as Class D’s strategist ("X") after minimal interaction and uncovering a "VIP" during a cruise ship test effortlessly. His actions stay self-serving: deserting his class for a ship during survival training and later devising a second-year strategy to trade future family funds for third-year students’ private points to reach Class A. Miyabi Nagumo uncovered this scheme and moved to block it. Kōenji’s sole stated aspiration is "freedom," prioritizing personal indulgence over collective goals. While fan theories speculate about his rivalry with Ayanokōji or hidden depths, his canonical role remains an unpredictable, self-centered force with sporadic competence.