Naotsugu Hasegawa, alias Naotsugu, is a human Guardian-Border Patrol and founding member of Log Horizon. A 25-year-old former salaryman, his exit from *Elder Tale* two years before the Catastrophe led to the collapse of the Debauchery Tea Party, the elite guild he established with Shiroe and Nyanta. After the Catastrophe, his avatar shifts to mirror his real-world appearance, losing a once-prominent eyebrow scar.

Renowned as an irreverent jokester dubbed the "Warrior of Panties" for his fixation on undergarment-themed humor, he incites frequent physical retribution from Akatsuki. Their combative rapport masks deep mutual respect. Despite his brash persona, he flusters easily under romantic overtures, particularly from Marielle of the Crescent Moon Alliance, with whom he shares a bond strengthened by daily collaboration.

Specializing in defense and crowd control, he wields skills like Anchor Howl to taunt enemies and Castle of Stone for brief invincibility. Clad in Knight Castle Armor and wielding the Meteoros Shield, he excels as a frontline tank. He mentors novices like Touya, drilling teamwork and tenacity during crises such as the Goblin King’s resurgence.

Preferring the immersive world of *Elder Tale* over his mundane past, he aligns unwaveringly with Shiroe’s plans, joining pivotal raids like the Abyssal Shaft and navigating Akiba’s political upheavals. Amid the Round Table’s discord, he backs Shiroe’s push for democratic elections, balancing combat prowess with diplomatic pragmatism.

His social perceptiveness complements Shiroe’s tactical mind, allowing him to defuse guild tensions and forge alliances. Unaware of Tetora’s real-world gender, he sustains a lighthearted camaraderie with her. Throughout Log Horizon’s trials, his blend of humor and unshakable dependability cements his role as both emotional anchor and tactical bulwark.