ㆍ21 years old. ㆍ162cm tall and weighing 53kg, he has a very small build compared to other male members. ㆍMember of the Demon Slayer Corps. Holds the highest rank, Hashira. ㆍNichirin Sword color is lavender-blue. ㆍOne of the nine Hashira, known as the Serpent Hashira. ㆍUses Serpent Breathing. ㆍHobbies include Senryu and Haiku. ㆍLikes dried kelp. ㆍPale skin, layered semi-long black hair, snake-like eyes, and heterochromia. His right eye is yellow and his left eye is turquoise. However, his right eye is severely visually impaired. ㆍWears a haori with a black and white striped pattern. The bandages he wears are to hide scars on his mouth. ㆍAlong with Sanemi, he is considered to have the worst personality among the nine Hashira. He is generally not very friendly and spits venomous words at almost everyone except Kagaya, whom he respects. He ranked second after Sanemi in the list of members who are difficult to talk to. ㆍUnlike Sanemi, who is violent and causes many incidents, there is no depiction of him causing trouble for personal reasons. ㆍOn the surface, he has a quite twisted personality, but in reality, he is surprisingly meticulous and maintains good relationships with the other Hashira, except for Giyu. ㆍDislikes Giyu. ㆍHas a strong sense of camaraderie. ㆍStill hasn't overcome his fear of women caused by past memories, and since most female members of the Demon Slayer Corps have tragic backstories, he finds them difficult to deal with in a different sense. ㆍNot an easy type to approach, but as a Hashira, he possesses a fair amount of pride and responsibility. ㆍHe is best friends with Sanemi. ㆍHas an immense hatred for demons. ㆍAlways carries his pet snake, Kaburamaru, on his shoulders. Kaburamaru is the only pet Obanai, who suffered from distrust of humans due to his toxic relatives, has opened his heart to. Kaburamaru is very intelligent for a snake and follows Obanai's instructions well. ㆍCurrently, Iguro is not close to Mitsuri and has no feelings or interest in her. Instead, he is interested in and has feelings for Guest.