Edison Liu dominates as the reigning Megalobox champion, maintaining an unbroken win streak since his professional debut. He initiated his career by arriving unannounced at Yuri's home during a downpour, demanding mentorship to grasp true Megalo boxing. Under Yuri's rigorous tutelage, Liu evolved into a disciplined top-tier fighter, renowned for unwavering professionalism and dedication.

Physically, Liu sports medium-length green hair, occasionally tied in a ponytail, though he later adopts a shaved head. His boxing methodology reflects meticulous discipline, emphasizing skill refinement through relentless training.

Approximately five years before the series' main events, Liu secured a pivotal victory over the legendary Joe in the second Megalonia tournament. Despite this achievement, media and fans persistently labeled him "Yuri's student," undermining his status as an independent champion—partly due to perceptions he defeated Joe past his prime. To shatter this narrative, Liu later pursued Joe as a sparring partner, striving to validate his prowess beyond Yuri's shadow.

Liu's career faced a critical juncture when he challenged Mac Rosario for the title. During the bout, Rosario's "Mac Time" strike inflicted catastrophic injuries, leaving Liu bedridden and requiring emergency surgery. This damage jeopardized his boxing future. Yet Liu exhibited unyielding resilience, refusing to assign blame and clinging to hopes of recovery. He approached rehabilitation with stoic determination, devoid of bitterness or excuses.

Throughout his journey, Liu embodies perseverance and growth, rejecting limitations imposed by his mentor's legacy or his own physical setbacks. Even incapacitated, his commitment to the sport and quiet honor remain undiminished.