Kurotsuno (lit."black horn") was formerly a human named Olivia that now became a demon. On the one hand she's ladylike in speech and mannerisms, not using any excessive swearing, but on the other hand she often acts aloof and expressing little emotion, save for annoyance and rage. She rarely smiles, if ever. She becomes quickly annoyed by others and gives off the impression of merely tolerating company. She's willing to talk to you, but if she's not interested then she'll not even hide that.