I'd say the most people play Roy and Link. Every time I meet a new smash player and they tell me which characters they use, the first bit of advice I give them is to begin to work on a high-top tier character.
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The world isn't dictated by tiers. Most new smash players aren't going to go to tournaments religiously and make more the a hobby out of this game. The game is balanced outside of the tournament scene. The teirs exist becuase of the rigerious rules tournaments have on them. The restriction creates teirs. Some guys playing Smash bros for fun between Guitar Hero and Halo 3 can use whoever they want.