[@Kimiyosis]

There is a nigh infinite number of professions available. Choose anything, from Fisherman to Astronomer to Tax Collector (OP as all Hell). Unless you can find a use for it in the plot, like an Engineer making a bomb or a Fisherman being able to real in people / items / fish, it can be treated as flavoring. People can have the same job, though only one can be granted Grand Master status, like the King of that profession.

There is as much depth as you are willing to put into it. Be a Chef and make Stat boosting items, or say your Race Car Driver as an excuse for being REALLY good at driving. Up to you.