Jinki Mukae organizes the enigmatic Deluxe tournament to crown Japan's strongest cardfighter. His profound grief over his older brother Shingi's death drives him to create the artificial intelligence Gui and spearhead the Uniformers group, seeking "ultimate strength" through data-driven uniformity as a coping mechanism. Physically, pale skin contrasts with pale green hair that covers his right eye, complemented by distinctive white headphones. He often wears a kimono secured by a thick belt and layered necklaces, enhancing his mysterious presence. Initially marked by deep emotional turmoil, this manifests in outbursts like his confrontation with Gui after Michiru Hazama's coma. He persists with Project Uniformers, demonstrating single-minded dedication.

Gui's defeat by Yu-Yu Kondo catalyzes Jinki's emotional growth, helping him partially move beyond Shingi's death. He reconciles with Gui, and together they embark on global travels to spread cardfighting's joy, reframing his mission as a tribute to Shingi's memory. This signifies a shift from isolated grief to outward purpose. During DivineZ, Jinki acquires the "Destined One of Protection, Alden" card after a vision, becoming one of its owners under Sybilt's influence. When Sybilt attempts mental corruption to advance the Destined Showdown, Jinki avoids it through Gui's unique ability to switch consciousnesses. This safeguard allows Jinki to pose unaffected as a double agent within Sybilt's group, secretly relaying intel about Sybilt's deeper manipulations to allies like Gabwelius and Gui.

His cardfighting reflects his journey. Early decks, guided by Gui, focused on mechanics like Soul-Charging for Griphogila or recycling Orders with Bist Aiyatvas. He later inherits Shingi's deck, symbolizing their bond. As a Destined One owner, he utilizes Alden to protect rearguards and manipulate battlefield dynamics, showcasing defensive flexibility. His victories include wins against Michiru Hazama, Urara Haneyama, Yu-Yu Kondo during will+Dress, and Masanori Iseki in DivineZ, where he confronted Masanori's forbidden attempts to revive Shingi, underscoring Jinki's acceptance.