For the fixed database roles such as db_datareader, by default the role and a schema of the same name are created. The owner of the role is "dbo" and that role owns the same-named schema. What would happen if I made "dbo", directly, the owner of the db_datareader schema and deleted the db_datareader role?
There's no reason to ever do such a thing. I'm with the others in asking why you would ever want to do this.
--Jeff Moden
RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row. First step towards the paradigm shift of writing Set Based code: ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
Change is inevitable... Change for the better is not.