Ciel Ayanokoji is a key character in the Melty Blood series, originating from the Tsukihime universe. She is a member of the Burial Agency, tasked with hunting down supernatural threats. Initially appearing as a high school student, Ciel is skilled in combat and wields powerful magic. Her dual life revolves around her mission to eliminate vampires and other dark entities. Ciel is complex, with a dark past tied to the main antagonist, Roa, making her both an ally and a formidable adversary. Her character explores themes of redemption and identity.