You simply need to look through the even commands a bit more. Simply use the choices command and the Name Input.
With the choices, it branches off into different things so that if you were to select "Thief," then you would use event commands to make a Thief (where you would need a character already made for each class).
Name Input will do what it says. To call up a name in database, use
\n[#]
, where the number in the database takes the place of #. If you're going to use multiple classes, you would need to set the number of the database in a variable so that it can change.
So after you change classes for them, set a variable to their database ID and to call up their name, use
\n[\v[#]]
where the number of the variable goes in the place of # there.