This is Alastair, also known as Astaroth, part of the evil trinity of high demons with Beelzebub and Lucifer. He's Eagleton's Quest's therapist/psychologist, using his demonic powers of the past, present, and future, to fuck with help the Society members. His famed honesty is deceptive/his intentions always have a darker purpose. He and Bee haven't seen eachother in a hot minute (a century or so), after a little spat and a cold shoulder that they're both over.