gluck_(sousou_no_frieren)
Glück is the Feudal lord of the Fortified City of Weise. He is the father of Lektüre and thus the father-in-law of Denken (sousou no frieren). He made a deal with Macht (sousou no frieren) about a hundred years ago to set up an experiment to help him understand humans and had Macht serve him as the family's mage.