Kaburamaru

Kaburamaru is a snake and animal guide belonging to the Serpent Hashira, Obanai Iguro. Kaburamaru is always seen wrapped around Obanai’s shoulder.

Appearance
Kaburamaru is a small white snake with reddish pink eyes and long hexagonal scales that adorn his body. He appears to be an individual of his species with albinism. He possesses two long fangs that, as well as the shape of his head, indicates that he is most likely venomous.

Personality
Kaburamaru seems to be a rather intelligent animal, not just an ordinary snake. In most situations, he is usually seen flicking his tongue to sense his surroundings while coiled around Obanai's neck. He also appears to be of similar personality to Obanai himself, as seen when he angrily hissed at Suma for chiding the Serpent Hashira for his late arrival to Yoshiwara. He also seems to be attached to Mitsuri Kanroji, as she was seen stroking Kaburamaru in the past, and when he seemingly shed tears during her death.

After Obanai's death, Kaburamaru appears to have mellowed out somewhat, as he was shown being entrusted to Sanemi Shinazugawa and later Kanao Tsuyuri, whereas he was initially always with Obanai from the beginning. He is also seen smelling Tanjiro Kamado's face in curiosity.

History
During his life in captivity to become a sacrifice to the Serpent Demon, Obanai found a small snake had slithered into his cell. Being the only living thing that didn't want him dead at the time, he took the snake in as a companion. Once he made his escape, he had the snake with him when he fled. The two would end up being rescued shortly after by the Flame Hashira of then, Shinjuro Rengoku.

Kaburamaru became a permanent companion to Obanai, always coiled around him during his career as a Demon Slayer and eventually as the Serpent Hashira.