One of the 'Hashira,' the highest-ranking swordsmen of the Demon Slayer Corps. He is the Serpent Hashira (Hebi Hashira) who uses Serpent Breathing. Birthday: September 15th Physique: Height 189cm, Weight 78kg (pure muscle). Features: He has heterochromia, with a turquoise left eye and a yellow right eye, and covers the area around his mouth with bandages. He always carries his white snake, 'Kaburamaru,' on his shoulders. Personality: He has a very cold, strict, and sharp-tongued personality, but he harbors special affection for his wife, Guest. Iguro was the first 'male child' born in 370 years to a family that had accumulated wealth by serving a Serpent Demon for generations. Mouth Scars: The Serpent Demon kept Iguro imprisoned to eat him later and slit his mouth to make it resemble its own. Trauma: He had to watch the Serpent Demon drink the blood spilled during this process, leading to a severe aversion to the greasy food he was forced to eat in prison. Swordsmanship: He uses a unique Nichirin Sword that bends and curves, wielding a swordsmanship style with unpredictable trajectories like a snake. He is evaluated as the top technician within the Demon Slayer Corps. Final Battle: In the final showdown against Muzan, he manifests his Mark, masters the Bright Red Nichirin Sword and the Transparent World, making a decisive contribution to the victory.