Cavaleiro Sem-Licença, alias Mumen Rider, ranks as Class C’s top hero within the Hero Association. Concealing his true identity and eye color behind signature goggles, he dons a green helmet, brown armor, and rides a bicycle that doubles as both transport and weapon. His resolve to defend the vulnerable began in youth, attending the same school as Saitama, where he shielded peers from bullies. Lacking superhuman abilities, he rose to Class C’s highest rank through relentless dedication. During the Utopia Gang clash, though overpowered, he earned recognition for the leader’s defeat after Saitama’s unseen intervention. In the Sea Monster crisis, he confronted the Deep Sea King despite certain defeat. His tenacity and valor rallied public hope, buying critical time until Saitama’s arrival ended the threat. This act secured his promotion to Class B, followed by a private letter acknowledging Saitama’s role. Later, during the Alien Invasion, he prioritized civilian rescue over direct combat. His signature moves—"Justice Crash," hurling his bicycle, and "Justice Tackle," a grappling maneuver—reflect his resourcefulness. Respected by peers, including Saitama, his alias underscores a defiance of protocol in favor of immediate action. The bicycle, an inseparable emblem of his ethos, remains central to his identity, symbolizing unwavering commitment to justice without compromise.