The pope is the monarch and best known resident of the Vatican.
There are no prescribed hobbies in the Vatican. Each resident may choose any hobby they wish as long as it is not prohibited by the Vatican. For example, pets are not allowed in the Vatican so residents could not keep a dog or a cat.
Ther Vatican is a country, not a church.
The main industry is production of coins
There is no river in Vatican City but the Tiber River is quite close.
Italian, though many languages are spoken there.
Probably Vatican City, as it is a self-sufficient country unto its self, and a) there are no non-Catholic civil servants, and no non-Catholic clergy resident or working in the Vatican.
The Vatican has no industry or agriculture. They do sell some religious items and souvenirs but few, if any, are produced in the Vatican.
The main important thing to know is that for the first game, Resident Evil 1, the main character is the Jill Sandwich.
The Vatican City is the smallest town,City,state or country in the world. Only one resident the pope.
I assume by your statement, a Vatican is a permanent resident of Vatican City. The duties could be anything from that as the head of state (pope), other Vatican officials who are in charge of or work in other ecclesiastical offices of the Vatican, members of the Swiss Guard or Vatican Police, maintenance workers, custodians, food workers, museum curators and workers, and any number of other positions. Each one has its prescribed duties and it is impossible to list all the job descriptions here.
Since the Vatican does not produce or sell, the main sources of income are donations, investments and tourism.
There are two ethnic groups that make up the main population of the Vatican. These are Italians and Swiss citizens.