Lau

Lau is originally introduced as the branch manager of a profitable Chinese trading company's English operations, and an acquaintance of both Ciel and Madam Red. But despite his odd friendship with Ciel, it seems that Lau is in a dubiously legal business himself: his real business is opium, and he runs an opium den that appears to be very well-off. Though he's aware that Ciel technically has some measure of power over such illegal businesses, his response to Ciel's threat to shut him down is merely to cheerfully comment that if that happens, he'll find another way to make a profit. Most of Lau's personal history remains unknown at this point, but he's very familiar with Ciel and far more powerful than he pretends: before anyone else notices, he somehow incapacitates the guards to a mansion that Ciel and the others are sneaking into.