demons

Setsuna Mudou is a teenager in Tokyo with a lot of unusual problems. First, he’s in love with his sister Sara--like real love love--and as if that weren’t enough, he’s also the latest reincarnation of the cursed female angel Alexiel, who rebelled against Heaven and defied God. When his powers start to awaken he’s approached by Kurai, a demon princess of Gehenna who was Alexiel’s follower, hunted by Alexiel’s insane twin brother Rosiel and his puppets, and viewed as a savior by an underground faction in Heaven. After he’s involved in the death of a classmate Setsuna finds himself on the run

The Space Between is another stand-alone novel by Brenna Yovanoff. This novel follows two protagonists—Daphne, the daughter of Lilith and Lucifer, and Truman, a human boy. The novel switches between their perspectives and creates a world of illusion, deceit, evil, and “in-betweens.”  While the story is dark, it also forces readers to decide what the true differences are between Angels and Demons and what characteristics make someone human.

Daphne is forced to leave Pandemonium and travel to Earth in order to find her missing brother, Obie. But first, she needs to find Truman, the last human

The year is 2018 and demons have taken over Atlanta, GA as well as the rest of the world.  Demon Trappers are hard at work in cities all over the world keeping demons from causing any more disruption than necessary to the humans who are struggling to get by in their daily lives since the economic upheaval of the recent past and the incursion of demons from hell.  Riley Blackthorne, daughter of famous demon trapper Paul Blackthorne, is the first and only female demon trapper apprentice in history.  When the demons start calling Riley by name she and the other trappers know that serious trouble

Kuroshitsuji, or Black Butler, is a manga composed of one part serious historical fiction, one part supernatural horror, one part fanservice, and five parts uncut crack.

Twelve-year-old Ciel Phantomhive is the last of his line and the Earl of Phantomhive, following the death of his parents in the fire that claimed the family mansion. He lives alone but for his servants: one who doesn't do much of anything, three who fail at everything they attempt, and the titular butler, Sebastian. In his own words, Sebastian is "one devil of a butler."

Literally.  Sebastian is a demon, contracted to Ciel

Although a sequel to The Drowning City, The Bone Palace stands alone quite well.  It's a dark, political, high fantasy mystery told from two perspectives: Crown Investigator and necromancer Isyllt Iskaldur; and the crown prince's mistress, Savedra Severos.

A prostitute has turned up dead, her throat slit.  Sad, but hardly uncommon.  The only thing that draws this to Isyllt's attention is that she was found carrying a royal treasure, and the scandal needs to be resolved before word can reach the king.  The investigation leads Isyllt into the deep underground to the vrykoloi, vampiric demons