I will assume you do not know much about DND, because there are definitely not 9 Classes, and "Thief" and "Mage" are definitely not any of them. There's Barbarian, Bard, Cleric, Druid, Fighter, Monk, Paladin, Ranger, Rogue, Sorcerer, Warlock, and Wizard, and then theres Artificer and Blood Hunter (which are often forgotten). None of these are considered Subclasses, but they all HAVE subclasses. I know it's been like 3 years, but please Fix this.
Considering the fact Blood hunter was not created by Dungeons and Dragons but instead by Matt Mercer of critical role,I would make the argument that it is not truly a real class but more so a fanon class,please check your facts. And Artificer tends to be more of a grey area as it can be very interchangable between being a class or a subclass.
But that still doesn't change the fact "Thief" and "Mage" are not classes. I understand Blood Hunter and to some extent Artificer, but the others are 100% all distinct Classes