Reisi Munakata holds the mantle of Fourth Blue King and commands Scepter 4, the clan responsible for regulating ability users. Twenty-four years old during the main series events, he stands 185 cm tall with dark blue hair, purple eyes, and frameless rectangular glasses. His appearance merges military precision with elegance, frequently showcased in Scepter 4's signature blue trench coat uniform or refined casual attire. He embodies sophistication, composure, and strategic thinking, favoring negotiation yet wielding formidable swordsmanship when required. Munakata prioritizes civilian safety and his subordinates' well-being above his own. Though generally calm, he displays ruthless determination against those he deems unworthy, particularly individuals harming children. His complex dynamic with Mikoto Suoh, the Red King, shifts from potential friendship to adversarial tension due to their conflicting duties. Munakata exhibits paternal care, notably recruiting Saruhiko Fushimi into Scepter 4 despite Fushimi's troubled past. He recognizes Fushimi's psychological struggles and shields him from threats like the Green King. He also safeguards Anna Kushina after Mikoto's death, saving her from danger and allowing her to use his first name despite her resentment. During downtime, he reveals a lighter side through puzzles and tea ceremonies, though his attempts at socializing with colleagues often cause unease. His backstory unfolds in *K: Seven Stories*. *R:B ~BLAZE~* depicts his ascension as Blue King and the rebuilding of Scepter 4 amidst rising conflicts with Mikoto Suoh's unstable HOMRA clan. *SIDE:BLUE ~Like Sirius~* illustrates his leadership post-Kagutsu Crater Incident, recruiting swordsman Takeru Kusuhara and establishing a Special Forces unit to address internal distrust within Scepter 4, highlighting his strategic rebuilding and management of dissent. In the spin-off *The Idol K*, Munakata is reimagined as head of an entertainment agency alongside Fushimi, competing with groups led by figures like Yashiro Isana and Nagare Hisui, each advocating distinct philosophies about idol performance. Specific details of Munakata's role in this setting remain unexplored. Across all portrayals, his character remains defined by unwavering principles, protective instincts toward those under his care, and a burdened sense of duty as King.