Sakonji Urokodaki, once the Water Hashira of the Demon Slayer Corps, stands as a retired yet formidable figure whose legacy intertwines martial mastery and mentorship. Renowned for perfecting Water Breathing techniques, he withdrew to mountain solitude to cultivate new generations of slayers, shaping prodigies like Tanjiro Kamado, Giyu Tomioka, Sabito, and Makomo. His visage remains eternally shrouded by a tengu mask, a symbolic guardian emblem from folklore, beneath which lies a face of unexpected gentleness. Clad in a cloud-patterned jinbei, navy pants, and leg guards, his austere attire mirrors his disciplined ethos. A mentor both stern and compassionate, Urokodaki’s training regimens—steeped in physical trials and mental fortitude—stem from haunting grief: thirteen disciples perished during Final Selection, slaughtered by the Hand Demon he once imprisoned. When Tanjiro cleaved the cursed boulder and survived, the stoic teacher wept in silent relief. Beyond combat, his influence shaped fate itself. He implanted hypnotic safeguards in Nezuko Kamado, binding her humanity, and staked his life on her restraint, vowing ritual suicide alongside Tanjiro and Giyu should she falter. Later, he shielded her during her transformation back to humanhood, a testament to unwavering guardianship. Though age dimmed his physical prowess, his strategic acumen and heightened senses—honed to track demons and perceive emotions—never waned. He forged Nichirin blades, prepared nurturing meals, and balanced rigor with paternal warmth. Loss etched his bonds. Giyu earned his respect through quiet dedication; Sabito and Makomo’s deaths deepened his resolve to protect Tanjiro. The fox-mask talismans he crafted, meant to safeguard, instead marked his students for the Hand Demon’s vengeance—a cruel twist resolved only by Tanjiro’s triumph. In twilight years, he rallied alongside Hashira comrades to defend the Corps’ stronghold, his presence a bridge between eras. From Edo-period battlefields to the whispers of mountain winds, his teachings endure through pupils who wield Water Breathing not just as technique, but as inherited resolve—a legacy unbroken, etched in blade and spirit.