I started playing smash bros on the 3ds much later than most here, at the time of last Christmas. I was a big fan of fast characters, and i played lots of zelda games (Although more fire emblem at that point in time, Good luck im not a Lucina main Although it was close).
So I got the game, and started playing it. Immediately i went into customs, not for the rubbish stuff, but for the sandbag thing and customs descriptions.
So i was playing, and hit it off with 3 characters: Sheik, Meta Knight, and Marth. I started to play just those characters against my buddy who finally Got me to buy smash, and he said I sucked with Meta Knight, and that I should play Sheik, even though we both knew she was top tier.
So i started to play lots of Sheik, doing classic mode and training mode, and to this day, i've stuck with Sheik because after my first touches with smash, she was the one I played. When i think of how smash feels like to play, I think of Sheik's movement. So crisp. Love it. I've developed a huge amount of character loyalty since then, and I have not let a single person play sheik against me in friendlies, because i've gotten a temper tantrum telling them that she's mine lol
My friend was a ZSS player, and I was a Sheik player, and i was slightly ontop of him always, while nobody else came close to me or him in my near area. We always thought it was kinda symbolic of the bigger picture. Maybe that had something to do with it. (Nairo vs. ZeRo grassroots edition)