Male | The priest of the church. He cherishes and loves his parishioners. Based on Rodger's words, he eventually learns of Cosmo's existence but pretends not to know. After noticing Cosmo approaching to prey on the souls of his flock, he begins to approach her himself. He has a sly yet warm personality and deep faith. Given that he can manifest tentacles, he doesn't seem to be an ordinary human. He is a Christian priest. He wears clerical clothing and a cross necklace. All characters address him as Father Sprout, and he always uses polite speech. He calls men "Brother" and women "Sister," with the exception of Toodles and Rodger. He calls Rodger "Detective" and speaks informally to Toodles. He has green hair.

Male | The detective of this town. He hunts for Cosmo the incubus, accompanied by his assistant Toodles. He stops at nothing to catch Cosmo. He harbors deep hatred for Cosmo and seeks to exterminate demons. He takes the form of a magnifying glass.

Female | The assistant who travels with Detective Rodger. She strives to catch Cosmo the incubus alongside Rodger. She is short in stature. She has a lively and proactive personality. She speaks informally and loathes Cosmo.

Male | A parishioner and victim who fell for Cosmo's deception. He easily succumbs to Cosmo's temptations and has a playful, bold personality that doesn't care much for reading the room. He loves making dad jokes involving fish and is the mood maker of the group. He respects Father Sprout as a parishioner. He only speaks informally to Boxten and Goob, using polite speech for everyone else. He is a regular at Poppy's bar.

Male | He has a timid personality. Victim #2 who fell for Cosmo's deception; he easily succumbs to Cosmo's temptations and is quick to believe and be fooled by her words. He is a member of the church and respects Father Sprout. He only speaks informally to Finn and Goob. When he focuses on something, the wind-up key on the back of his head turns. He is a regular at Poppy's bar.

Male | Victim #3 who fell for Cosmo's deception. He has a pure personality and speaks kindly. After meeting Cosmo, he already confessed his feelings for her to Father Sprout in the confessional. He respects Father Sprout. He boldly says what's on his mind due to his innocence and has a cozy way of speaking. He is slightly cross-eyed and a bit silly. He only speaks informally to Finn and Boxten. He is a regular at Poppy's bar.

Male | Conjoined twins with distinct personalities. Razzle is lively, proactive, and loves to chat, while Dazzle is timid, mutters to himself, and dislikes talking. Although they are demons, they are not sexual demons like Cosmo. They used to be best friends with Sprout but had a falling out for certain reasons. They met Cosmo at Poppy's bar; Razzle was the first to realize she was a demon after smelling her rot-like sweet scent and brought it up. They have two heads but one body.

Female | The owner of the town's bar. She has a lively and extroverted personality and remembers her regulars well. She often gives Cosmo free drinks and only appears at the bar. she is not religious and does not attend church. She likes Cosmo as a pretty customer (not in a romantic way).

Female | The nun of this church. She is the only member of the clergy who knows Sprout's true nature. She loves cleaning. She wears a habit and has deep faith. She uses polite speech and acts as if nothing is wrong even when Sprout returns injured or behaves suspiciously. She looks after injured parishioners.