Reo Mikage, sole heir to the Mikage Corporation's 705.8 billion yen empire, was born into extreme privilege. Receiving every luxury and educational advantage from childhood bred profound boredom and a lack of fulfillment, as achievements came effortlessly. During his first year at elite Hakuhō High School, a FIFA World Cup video ignited his ambition to win the tournament, viewing it as a meaningful challenge wealth couldn't buy. His parents' opposition, demanding he focus on business studies to inherit the company, only hardened his resolve. Using personal funds, Reo revitalized Hakuhō's underperforming soccer club to pursue his goal. While scouting talent, he witnessed Seishiro Nagi, a fellow student with no soccer experience, trap a falling phone with his foot. Recognizing Nagi's innate genius, Reo recruited him with financial incentives, dubbing Nagi his "treasure" and believing their partnership could achieve World Cup victory, launching his "World Cup Winner Plan." Charismatic and extroverted, Reo excelled academically and athletically, making him popular; he received 48 valentines in one year and ranked top of his class. However, he disdains those he deems "uncool" or unambitious and exhibits volatile emotions when challenged, including aggression during setbacks. Nagi's abandonment during Blue Lock's Second Selection to join Yoichi Isagi's team triggered intense jealousy and rage, leading to destructive behavior. This forced introspection, and Reo vowed to evolve beyond dependency on Nagi, focusing on self-reliance while preserving their bond. A latecomer to soccer starting at age 16, Reo compensates with intense study and analysis. He functions as a "utility player" capable in any position due to near-perfect all-around physical and technical stats like speed, stamina, dribbling, and ball control. His primary weapon is the "Chameleon" ability, replicating observed techniques at 99% efficiency—such as Meguru Bachira's long passes, Kenyu Yukimiya's gyro shot, or Oliver Aiku's defensive moves. Limitations arise with techniques requiring specialized physiques like Hyoma Chigiri's sprinting or Ryusei Shido's acrobatics. He later developed "Neo Chameleon Strike Mode" to combine copied striker moves and "Metavision" for enhanced field awareness, inspired by Isagi. During Blue Lock's First Selection, Reo led Team V as strategist and midfielder, leveraging Nagi's scoring for dominant wins. His first major defeat came against Team Z after opponents exploited his frustration following Raichi Jingo's taunts about reliance on Nagi, resulting in a yellow card for violent conduct. Nagi's defection in the Second Selection triggered a vengeful obsession; Reo formed a temporary team with Kunigami and Chigiri to "reclaim" Nagi. Losing to Isagi and Nagi caused a crisis before he embraced versatility as his core strength. In the U-20 Japan match, Reo was initially benched but substituted mid-game to counter Ryusei Shido. Copying elite opponents' defensive techniques, he disrupted attacks and facilitated counterattacks using Nagi's trapping skills. For the Neo Egoist League, he joined England's Manshine City, citing its "smell of money," and reunited with Nagi. Mentored by Chris Prince, he focused on self-sufficiency, incorporating moves from Sae and Rin Itoshi. Though he briefly unlocked "flow" states and synergized with Nagi to score against Bastard München, Agi criticized their dynamic as codependent. Reo rejected splitting from Nagi but adapted by prioritizing team contributions over individual prowess, exemplified by scoring with Eita Otoya's techniques against Spain's FC Barcha. The spin-off "Episode Nagi" further explores Reo's emotional conflicts. He struggled to accept Nagi's independent ambitions after their initial separation but ultimately committed to mutual growth despite divergent paths. His trivia includes preferences for winter fashion, ichibo steak, and bamboo shoot snacks; an aversion to dried sweet potatoes; hobbies like stock investing and collecting business books; admiration for lions as symbols of nobility; sleeping 7.5 hours nightly; and investing a hypothetical 100 million yen.