Might Guy is a jōnin from Konohagakure, famed for his exceptional taijutsu skills and his passionate philosophy celebrating the "Power of Youth." He is the son of Might Duy, known derisively as the "Eternal Genin," whose unshakeable optimism and belief in hard work profoundly shaped Guy. As a child, Guy struggled significantly, failing his initial Ninja Academy entrance exam due to an inability to use ninjutsu or genjutsu. He ultimately graduated as an alternate student alongside Kakashi Hatake, sparking their enduring rivalry and friendship. During a critical mission with Genma Shiranui and Ebisu, Guy's team faced an ambush by the Seven Ninja Swordsmen of the Mist. Duy intervened, sacrificing his life by opening all Eight Gates to save them—a defining event that cemented Guy's commitment to protecting what is precious. Guy's rivalry with Kakashi flourished through constant challenges, spanning combat to everyday contests like Rock-Paper-Scissors, resulting in a nearly balanced win-loss record. This dynamic fostered deep mutual respect, with Guy consistently supporting Kakashi through personal losses, including the deaths of Obito Uchiha and Rin Nohara. Confined by a barrier during the Nine-Tailed Demon Fox's attack, both were unable to defend the village. Later, Guy sought to join the Anbu to aid Kakashi but was rejected for lacking the necessary "darkness." He instead advocated for Kakashi's reassignment to teaching genin, believing it would restore his kindness. As a jōnin, Guy formed Team Guy, mentoring Rock Lee, Neji Hyūga, and Tenten. He deeply identified with Lee's struggles—both initially lacked ninjutsu and genjutsu—and nurtured Lee's focus on taijutsu, instilling the "My Rules" philosophy demanding rigorous self-improvement through intense training. Their bond evolved into a father-son relationship, with Guy teaching Lee the Eight Gates technique under strict conditions: only to protect cherished people or in life-threatening situations. Guy maintained similarly encouraging, though less intense, relationships with Neji and Tenten, emphasizing perseverance and discipline. Guy's personality radiates exuberance, marked by his iconic "nice guy pose"—a thumbs-up, wink, radiant smile, and often a verbal "ping." He frequently proclaims himself "Konoha's Sublime Green Beast of Prey" and champions the vibrancy of youth through tearful, dramatic displays of encouragement. Despite his eccentricities, he exhibits tactical seriousness in combat and missions. A notable quirk is his poor facial recognition, causing him to forget adversaries like Kisame Hoshigaki after multiple encounters. He prefers non-bladed weapons and avoids ninjutsu even when capable, opting for physical disguises over transformation techniques. In combat, Guy excels in taijutsu and the Eight Gates, a forbidden technique unlocking chakra restrictions at immense physical cost. He can safely open up to seven gates, employing techniques like Morning Peacock and Daytime Tiger. During the Fourth Shinobi War, he opened the Eighth Gate against Madara Uchiha, unleashing the Night Guy technique. This act nearly killed him, but Naruto Uzumaki's intervention saved his life, leaving him permanently reliant on a wheelchair. Post-war, Guy transitioned to teaching at the Ninja Academy and mentoring Lee's son, Metal, while remaining active on missions alongside Kakashi and Mirai Sarutobi. Guy appears across manga, anime, novels, films, games, and the spin-off *Rock Lee's Springtime of Youth*. His character embodies resilience, the value of hard work over innate talent, and the lasting impact of mentorship. Physically, he is recognized by his thick eyebrows, bowl-cut hairstyle, and signature green jumpsuit, often paired with orange leg warmers and a Konoha forehead protector worn as a belt. His summoning animal is the tortoise Ningame, reflecting his disciplined yet sentimental nature.