Beyond this, consider how these professions might vary depending on who the customers are - nobles, or lower class. Are they good at their job or just scraping by? Do they work with lots of other people or on their own? City or village?
For younger characters:
- Apprentice to any of the above
- Messenger/runner
- Page/squire
- Pickpocket
- Shop assistant
- Student
- Looks after younger siblings
(Images all from Wikimedia Commons)