Feh.
Normally I jump into fighting game topics pretty easily, but... depends on the games. Aint fond of Capcom's stuff, never was, particularly their fighting games. Tekken is..... okay, I guess. Typically though I prefer Arc's games (they're much faster & more aggressive games, works well for my non-existent patience), AKA Guilty Gear (my favorite), Blazblue, and Persona 4 Arena. Best characters from those, Bridget, Noel, and Labrys, respectively.
As for the games mentioned HERE, I do like Mortal Kombat enough at least, though I wasnt aware it was one of the three "greats" right now, though I aint the most attentive sort, so that's normal for me. Certainly nobody I meet ever seems to care about it, feh.
But picking one from THAT game, I'll go with Scorpion, because he's freaking Scorpion. With that quite iconic move that is so hard to forget (and much fun to use).
Not to mention nostalgia value... MK was the first fighting game I ever really got into waaaaayyyyyy back when.