Ermac.
I had never seriously played an MK game before 9 truthfully. They were all for fun games when I was a kid and the later games didn't interest me. When I picked up 9 I literally just picked a character that I thought was cool. I found his moveset and accessibility to be awesome, keep-a-way mixed with some serious combo potential made for a really fun character, plus he was an absolute badass.
Needless to say, my friends now call him EZMac when I play him, and some of his stuff does have moronic hitboxes, but I've put a lot of work into him, and I really enjoy him, and hopefully something will come of it.