[1][2] The coadjutor automatically succeeds the diocesan bishop when he retires, dies or leaves office for another reason.
In the Latin Catholic Church, the coadjutor is a priest or bishop appointed by the pope in Rome.
Under canon law, the coadjutor must served as the vicar general, the principal deputy administrator of the diocese.
[4][5] In modern church practice, the pope can appoint a coadjutor to assist a bishop who needs help due to declining health.
The pope gave Touvet special powers to oversee the preparation of seminarians and the financial management in the diocese.
The code also allows the pope to appoint an auxiliary bishop to a diocese "with special faculties [powers]", but without the right of succession.
[10] Under the old 1917 Code of Canon Law, the pope did not have to give an coadjutor cum jure succesionis ("with the right of succession").
They might hold other important posts within the Catholic Church, or might be auxiliary bishops that the pope wanted to honor with the title of coadjutor.