And that takes my point even further. What DOES Doc have to distinguish himself like PM? Pills and Viruses. That's not much.
Furthermore, PM is NOTHING like regular Mario. Partners, Hammer, Pixls, Badges, Items, AND he has a completely different personality. EVERYONE in Paper Mario does. Doc does not.
Different...personality...? It's ****ing MARIO, dude. How in the Hell can Mario have a different personality while he's made out of paper?
And same could be said for Doc, he's busy looking for cures for the common cold and trying to save lives within the Mushroom Kingdom.
He doesn't have the same "personality" as the carefree, adventurous Mario. He's more serious. (While still showing a sense of humor)
And that's just a sack of crap. Same with Paper Mario having a different personality than "Non-Paper" Mario. It's not like Link and Toon Link, where, they are LITERALLY, different people that take the name "Link".
He also has Doctor tools, such as his stethoscope, defibulator, syringes, etc. As ChronoBound proved, Doc can be unique if effort was put into it.
Not trying to shut down the idea of Paper Mario, as he would be an interesting character IMO, but something as absurd as a "different personality" irks me that people would try to argue.