Now the real question would be... could you develop an actual RPG/MMORPG to behave like this? You don't pick the class, the class picks you.
I've played one exactly like that. I forgot it's name though. It must be around 20 years old now.
Now the real question would be... could you develop an actual RPG/MMORPG to behave like this? You don't pick the class, the class picks you.