Initially, before I knew anything about the intricacies of the game, I played Roy because he was cool. And my super sick spot dodge/fsmash mind games were too much for my neighbors to keep up with lol. When I saw the documentary, I was inspired by KDJ's Sheik and a little later the fact that Sheik was the only character who I could look good playing (and a little Falcon/Falco on the side because they seemed cool too).
A little while after that I realized that my Sheik only looked good because of how much more complex the other characters were, and how boring it seemed playing Sheik now that I understood so much more about the game. After months of practice, I settled (sort of) on Fox because he is so comfortable to me. However, I thoroughly enjoy playing lots of other characters, particularly Luigi, Falcon, G&W, Marth, Falco, and even Sheik (as well as all the others in my sig to a lesser degree). Honestly, they're too much fun to let go of. I could see myself maybe abandoning Sheik (because she's kinda boring) and Falco (because he just doesn't feel as right to me as the others), but I'm having a hard time focusing solely on Fox in preparation for my first tournament this weekend.