Aldin is a relatively minor functionary in the Immortal Library of the Great Architect in the catacombs under Paris. He is the brother of Jiminez Hoffmann, and so that is presumably his last name, too, but this has not been stated directly in the Canon. In the past he has evidently been assigned to work with/mind his brother whenever the latter fellow finds his way into contact with the Library and its personnel, a task which Aldin does not appear to relish. His superiors, on the other hand, are hinted to very much enjoy reading the resulting reports. While he is intelligent and resourceful, unlike his brother he has not yet shown any signs of being a Spark.