There are many followers of Petrello, all of which follow and know the Prophecy of Petrello closely. The Followers of Petrello are all ranked into four classes: Prophets (Those who make major contributions to the Prophecy of Petrello and furthermore are leaders), Apostles (Those who have made minor contributions to the Prophecy of Petrello), Disciples (Those who are enrolled in a class which is taught by Mr. Petrello), and Followers (Those who are not enrolled in a class under Mr. Petrello, yet still follow the Prophecy of Petrello).