- "—And now the Curators seem to think we’re the new Heterodyne Boys!"
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.
He enters the story when he is Agatha with her study of the Van Rijn notebook she has just donated to the Library. He comes across as being rather timid and fretful, but it is eventually revealed that this attitude is to at least some degree a . He helps/follows Agatha when she finds her way into Van Rijn's long-lost Hermitorium, and then accompanies her and her friends into the sealed ex-Corbettite artifact vaults which are present in the Library's territory, as they search for the missing Doctor Dio Zardilev.to assist
In regards to this second trip, he is engaged in a clandestine effort with the Arguron princess Larana Chroma to obtain possession of an as-yet unrevealed object, a fact he wishes to conceal from both his brother and Agatha. They are successful in this quest, and Aldin remains behind in the Library with the object as Agatha and her friends return to the surface.
The New Heterodyne BoysEdit
Aldin complains that his brother is always dragging him along on incredible adventures that Jiminez thoroughly enjoys and he hates, and which often result in Jiminez being seriously injured in some fashion and/or Aldin being taken prisoner and stripped of most of his clothes. His reports on these escapades are greeted with with a great deal of  Aldin is stout in maintaining that his accounts are entirely factual, even "the thing with the naked mole rat queen". He has mentioned the titles of a few of these reports.along with a certain amount of skepticism in some quarters.
- The Adventure of the Haunted Topiary
- The Secret of the Perfectly Spherical Cow
- The Mystery of the Cyclopean Binoculars