Oh there's far more with Conchita. Her grotesque tastes her powers as Necromancer, which she uses to decimate an army, the fact that she punishes undead soldiers by eating parts of them while they are conscious and that she simply refuses to die thanks to a Healing Factor granted through her Deal with the Devil. In the novel, her cannibalism of Carlos, Arte and Pollo is nothing but Nightmare Fuel. Conchita is more of a monster than a human by the end of her arc.
The worst part? Even in death, shewins. She gets exactly what she wanted, she isn't punished and heck, she even kills the Demon of Gluttony itself. By eating it!
The Madness of Duke Venomania is pretty disturbing as well, with the title character making a Deal with the Devil in order to lure women into his harem and keep them as sex slaves.
Not to mention that the preview for the new Duke Venomania manga reveals that to activate these powers he had to stab himself in the chest with the Venom Sword. And he was totally okay with this too.
And the Venomania stuff just keeps getting worse! There is a lesbian character in the novel called Lolam Eve. The brainwashing Venomania does to her has to be extra-powerful to make her forget her sexuality, and her mental burden over being brainwashed into this heterosexual affair is so great she often is found lying still on the floor and eventually just... Doesn't wake up one morning. What makes this worse is that the Venom sword keeps its victims brainwashed through regular sexual intercourse. What would normally be Unfortunate Implications is made Nightmare Fuel in this novel, ladies and gentlemen!
In Project [MA], it is revealed that Eve was the original MA and became pregnant with twins but lost them due to the side-effects of a brainwashing drug given to her by the scientist in charge of her. The scientist? Adam Moonlit.
Even the novels aren't safe! Clarith's reaction when she hears about Michaela's death? She tries to bite her own tongue out! Even the soldiers holding her hostage were freaked out!
Blood-Stained Switch. Where to begin? The protagonist has a psychological disorder that causes a murderous alternate personality to take control of her body at random intervals, and even though the protagonist tries to fight against her, she can't keep her in check. Said alternate personality proceeds to brutally murder her father, leaving his corpse so badly mangled that it's not even recognisable as a human body any more and instead looks like "a pulpy lump of blood and flesh". The protagonist then receives medication that is supposed to subdue her alternate self, but even this doesn't work. In the end it is implied that the protagonist is killed because there is no way of keeping her alternate personality in control. Honestly, pretty much everything about this song is creepy.
The ambiguity of MA, the Sorceress of Time, as to who and what she is. Her creepy expressions whenever she appears don't help matters.
Hansel and Gretel's reincarnations, Arte and Pollo, are even worse than their originals. Delightfully serve Conchita, and command her undead army. The scene in which they are chasing Platonic is like something out of a Slasher Movie, filled with childlike "Hide-and-Seek" dialogue from them (keep in mind, they are around their mid 20s) and they keep Hansel and Gretel's trait of smiling unsettingly.