Santa Muerte

Santa Muerte (サンタ・ムエルテ) is the Goddess of Death and the current Guardian Ghost to Peyote Diaz, after being resurrected by Asakura Hao.

About
Santa Muerte is a tall skeletal figure with long black hair. She wears a white, silky traditional Mexican dress with a flower veil and belt and wields a makeshift scythe that has a handsaw for a blade, is wrapped in barbed wire, and has a large iron ball hanging from it.

Santa Muerte is shown to be incredibly possessive and in love with Peyote, attacking and killing anyone who hurts him. She is also a silent spirit, not seen speaking once.

Asakura Hao resurrected Peyote and gave Santa Muerte to protect him, and after Peyote realized that Hao might want him to fight in the Flower of Maize, he accepted Santa Muerte as his new Guardian Ghost.

New Trance and Attacks
Saint of Death: El Muerte (死の聖者エル・ムエルテ)

Trivia

 * Nuestra Señora de la Santa Muerte, or simply Santa Muerte, is a personification of death in Mexican neopaganism and folk Catholicism.