Octavia was Claymore No. 2 of her generation and eventually became an awakened being. During her lifetime, she was known as "Wild Horse Octavia" (沛艾のオクタビア, Haigai no Okutabia). She was among the group of Awakened former single-digit warriors who gathered outside Rabona to witness the being whose power surpasses the Abyssal Ones.[1] In her human form, Octavia appears to be a young woman with long, fair hair worn loose and short bangs swept to the left. She has a single braid that arises from just above one ear, looping around the back before disappearing above the other ear.

Octavia's awakened form consists of a giant body like her human form. Instead of having and human like lower body, Octavia's lower body closely resembles a horse, like Isley's centaurian form. Octavia's overall form resembles a nuckalavee, which are demon horses with a human torso attached to the back of the body. Based on her demeanor while talking with the Ghosts, Octavia seems to be quite light-hearted and somewhat cheerful. However, when in battle, she exhibits some degree of recklessness, unmindful of those she may hurt while attacking, despite her ability to quickly assess a situation and keep a cool head. This may be an allusion as to why her nickname is as such, although her Awakened form may lend this distinction. Octavia's body is consisted of ribbon tentacles spiraled together. Octavia thus has the ability to "unravel" parts of her body into ribbon-like strips, not unlike that of Riful. She has been shown to use the strips defensively, such as unraveling her head to avoid being absorbed by the Destroyer, and offensively, unraveling her arm into several whips to attack Cassandra.