There are some really good lists/names here. Good job, good effort!
However, my list starts with KG. Even over K*be. Easily over Melo. And it's not really close.
I like Iverson. I would've liked Reggie (on our team). I don't like Harden much, same with Tyson Chandler (remember him trying to out-tough Przybilla for about 2 years straight?) I wouldn't take back #12.
Basically, I hate fake-tough guys. I'm talking about guys who jabber-jaw, punch in nuts, talking about "being a soldier" and "going to war" and then running from an actual fight. I hate fake-tough guys that pick on little guys. Or guys that talk smack but know they'll never have to put up or shut up. (Ricky Davis, Lance Stevenson, Patrick Beverley, I'm looking at you). I also don't have a large spot in my heart for guys who refuse to do the dirty work to be good at their position. Big guy who doesn't rebound? PG who doesn't pass? Wing who doesn't play D? GTFOH.
As for the game, if you have a transcendent one, you have one. MJ was/is a complete asshole, but he could play (obviously). Iverson was similar. I loved watching him play. KG? Not transcendent.