Itsuki Takeuchi, Takumi Fujiwara's best friend and their gas station co-worker alongside Koichiro Iketani, stands 163 cm tall, weighs 55 kg, and has black hair. His loud, enthusiastic, and often comically obnoxious personality makes him the primary source of comic relief. He passionately idolizes street racing despite lacking natural driving talent, frequently overestimating his own skills. Motivated to emulate Takumi, he saved up to buy what he thought was a Toyota AE86 Levin, only to discover he'd mistakenly purchased an inferior AE85 with less power, weaker brakes, reduced chassis bracing, and looser suspension. This error plunged him into despair until Takumi demonstrated the car's potential through skilled downhill driving, proving driver ability matters more than machinery. This solidified Itsuki's self-proclaimed membership in the Akina SpeedStars as the "Lonely Driver," where he remains the most optimistic and excitable member despite limited prowess. He later modified the AE85 with a bolt-on turbocharger and front-mount intercooler, boosting power to around 150PS. In *Legend 2: Racer*, Itsuki accidentally accepts a downhill challenge from Myogi NightKids leader Takeshi Nakazato at the gas station without Takumi's consent. Panicking when Takumi initially refuses the race (not considering himself a racer), Itsuki tries to apologize to the NightKids at Mount Akina, narrowly avoiding confrontation when Takumi arrives to compete. This highlights Itsuki's impulsive eagerness to participate in racing, often creating complications. His romantic life involves disappointments. His first relationship, with Saori, ended after Shingo Shoji (NightKids) caused him to crash while driving her home, traumatizing her. Later, he dated Kazumi, who initially mistook him for a vandal but grew fond of him. Their relationship ended when she moved to Saitama with her brother, Wataru Akiyama, deepening his "Lonely Driver" persona. He respects figures like the Takahashi brothers, maintains SpeedStars friendships, and experiences rivalries with groups like the NightKids and Emperor. He likes Taiwanese bananas, race cars, and racers, disliking front-wheel-drive cars (FFs), automatic transmissions, and diesel engines. By *MF Ghost*, he remains in Shibukawa working at the converted charging station, is married, and has children, indicating a transition from his earlier ambitions.