Gustav

The Guildmaster is the master of Ehrenfest's Merchant Guild and Benno's senior. He and Benno have a fairly long lived rivalry and don't get along, although they do understand each other pretty well. Once he becomes aware of Myne and the products that she keeps coming up with he keeps trying to poach her for his own store.

He dotes on his granddaughter Freida and after learning that she too has the Consuming he arranges a lifetime contract with a lower class aristocratic family for her. While this may seem harsh, selling her out, it is actually the best way to save her life. It later turns out that they carefully selected the partner as a decent guy.