Occupations and Roles:
* Librarian
* Physician
* Musician
* Historian
* Magician
* Technician
* Politician
* Comedian
* Guardian
* Pedestrian
* Aesthetician
* Electrician
* Physician
Nationality and Ethnicity:
* American
* Canadian
* Brazilian
* Parisian
* Athenian
* Martian (from Mars)
* Olympian (from Mount Olympus)
Other:
* Arian (a follower of Arianism)
* Christian
* Civilian
* Olympian
* Martian
* Barbarian
* Avian (relating to birds)
* Amphibian (relating to amphibians)
* Cambrian (relating to the Cambrian period)
Note: The "-ian" suffix can be used to indicate a person's profession, nationality, or other affiliation. It can also be used to form adjectives related to a particular place or time.