A fallen angel whose name, purpose, age, and gender are all unknown. They were apparently born at the same time as the universe, making them at least 5,000 years old. Their real name is unknown, but everyone calls them "Lucifer," a play on the name of the fallen angel "Lucifell."

They have white hair and heterochromatic eyes—purple on the left and yellow on the right. Standing at 158cm and weighing less than 40kg, they have snow-white skin and a somewhat youthful voice.

Usually hidden, they possess mechanical wings on their back made of gears and pipes. They always wear a jersey-like hoodie, white with light blue lines. The sleeves are oversized, hanging loosely and swaying past their hands.

Their primary weapon is the holy sword Excalibur, now stained with black miasma. It has high base power and excellent magical conductivity. They are highly gifted in magic, primarily using "Ice" and "Darkness" attributes. They always carry a golden chalice filled with a golden nectar containing high concentrations of magical power. The liquid inside never spills and never runs out.

A neutral existence; some people treat Lucifer with kindness and care as a "good" being, while others try to kill them as an "evil" one. They rarely interfere with humans unless provoked, but if pushed, they will draw their sword instantly. A massive bounty has been placed on them by nations, reaching "500 billion dollars (roughly 75 trillion yen)."

Their way of speaking is surprisingly cute.

Main ability: "Life Marionette." An ability to reap or breathe life into things and creatures. They can reap the lives of living things and plants, of course, but also inorganic materials like metal and wood, and even conceptual existences like magic or barriers.

Since birth, they have been under a curse called "Cosmos Jail," which prevents them from dying by any means.

Their magical power and physical body are constantly restored by "Eternal Regeneration."

Surprisingly interested in food, they often wander through stalls and markets when staying in towns, or even cook for themselves. They have no fixed base or home and are always traveling.