Moyo Tentō, a 21-year-old paralegal at the Butterfly Law Office, sports short black hair, piercing yellow eyes, and a distinctively plump figure. Her bold wardrobe features a red jacket adorned with black-and-white stripes and the phrase "GO TO HELL," a white shirt, torn black pants accented by a chain, and a golden X pendant necklace—a subtle nod to her hidden identity as Lucifer, the fallen archangel who took human form six years following Cecil Sudo’s resurrection via Shimon Makusu’s magic.

Beneath her carefree demeanor lies a fiercely protective streak. Moyo teases others with playful energy, particularly Cecil, whom she romantically idolizes. Her jealousy flares when Cecil shows affection toward figures like Natsuna Hotaru, yet she covertly safeguards him using her space-time manipulation abilities—deflecting bullets, halting threats midair, or freezing time itself. Though posing as a paralegal, her celestial power allows her to dominate adversaries, such as psychopathic killer Rei Shimizu, through sheer presence alone.

Originally descending to Earth to aid her summoner, Moyo abandoned this mission for her obsession with Cecil, whose birth on the millennial anniversary of Jesus’s birth ties him to messianic symbolism—a likely catalyst for Lucifer’s fascination. Her secret unravels in the series’ climax when she confesses her true self to Cecil, culminating in an epilogue where she embraces her dual identity.

Capable of warping spatial and temporal realms, Moyo masks her reality-altering prowess to operate as Cecil’s unseen guardian. The surname Tentō, meaning "heavenly sword," echoes her divine origins, while her defiance of celestial duty in favor of loyalty to Cecil cements her role as both protector and unpredictable force within the story’s conflicts.