At a glance:
Name: Quinterius, shortened to 'Quintus' and then, 'Quin'.
Age: AOY, unknown.
Quintus is a character who's controversial in his acts, being the master handler of all the servants in Hell. He takes his position rather seriously, perhaps due to this, as he believes he runs a clean and fair business. For what it is, it is indeed managed in a much better way than most would believe it to be. Servitude is voluntary, a way to get a good profit if you're completely talentless and good for absolutely nothing.