Suzuno Kamazuki, born Crestia Bell in Ente Isla, served as a covert assassin for the Church of Ente Isla, eliminating dissenters through brutal executions that earned her the epithets "Reaper" and "Shinigami." Dispatched to Earth to apprehend the rogue bishop Olba Meyer, she assumes her alias and adopts traditional Japanese attire and mannerisms learned from historical dramas, creating a striking contrast with contemporary society.

Initially antagonistic, Suzuno’s loyalty fractures upon witnessing the Church’s corruption and Sariel’s brutality toward Emilia. Abandoning her mission, she independently evaluates Sadao Maou’s motives, cautiously aligning with his faction while retaining skepticism. Though proficient in summoning a devastating war hammer, she avoids combat post-defection, her restraint reflecting lingering remorse for her violent past.

Within the household, she aids Shiro Ashiya in chores, excels at cooking, and compels the indolent Hanzo Urushihara to contribute, her disciplined nature counterbalancing the group’s chaos. Her struggles with modern technology underscore her displacement, yet her pragmatic authority stabilizes their dynamic. Her relationship with Maou oscillates between cooperation and tension, exemplified by their joint defense of Chiho’s farm against thieves.

Raised devoutly by the Church, Suzuno was manipulated into enforcing its will through assassination, fostering a conflict between indoctrinated loyalty and moral awakening. Her eventual rejection of the Church’s dogma drives her quest for redemption through protecting Earth, marking her transition from detached enforcer to a principled ally in confronting supernatural and everyday trials.