Fumihiro Jōyū serves as the General Manager of the MFG races, a position that places him at the center of the series' competitive events. His background is deeply rooted in the street racing scene from the previous era, as he was formerly a mechanic and the executive assistant to Ryosuke Takahashi in the legendary racing team known as Project D. This history explains his deep understanding of racing logistics and strategy. In MFG, he operates under the direction of Ryosuke Takahashi, managing all aspects of the organization's operations. His duties are extensive and include adjudicating problems that arise during races, providing live commentary for events, and even selecting personnel and the MFG Angels.

In terms of personality, Jōyū is portrayed as a highly competent and detail-oriented professional who executes his role with a sense of purpose. His motivations are closely tied to his past loyalties and his current responsibilities. He is personally instructed by Ryosuke Takahashi to keep an eye on Kanata Katagiri, who is the student of the legendary driver Takumi Fujiwara. Initially, Jōyū does not recognize Kanata, but upon realizing his identity, he becomes a quiet observer of the young driver's progress, suggesting a sense of duty to his former leader and an interest in the legacy of the drivers he once knew. His role in the story is primarily that of an authority figure and a narrative link to the past, providing continuity for long-time fans and establishing the stakes of the competition from an organizational perspective.

Key relationships define much of his character. His most significant connection is with Ryosuke Takahashi, having served as his trusted second-in-command and friend since their days with the Akagi RedSuns and Project D. He is also an old acquaintance of Takumi Fujiwara, and he sees clear echoes of Takumi's driving style in Kanata Katagiri. This perception adds a layer of personal interest to his professional observation of the rookie driver. While his own driving abilities are not a focus of MF Ghost, his abilities lie in management, strategy, and logistics. His skill is in ensuring the complex racing series runs smoothly, a talent he developed from years of setting up battles, scouting courses, and managing the countless details behind a racing team. His development from the supporting mechanic and assistant of Project D to the General Manager of a national racing series represents a significant professional rise, solidifying his place as a key figure in this new generation of motorsport.