Well, I mean you can do pretty much anything with the d20 system (which is the system that D&D runs on). And I didn't really mean that I would mix Mario and D&D so much as I'm making a d20 Mario RPG. I'm making it so you can play as humans, toads, beans, koopas, and something else I can't remember at the time. But yeah, you can choose race and class and all that stuff. I'm eventually hoping I can get to the point where I can see a group of adventurers consisting of a bean knight, a toad bard, and so on and so forth. ^_^
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"The bigger they are, the harder I fight."