See, I think Sir Dan is actually going to less-played not because of his moveset being bad, but because it's actually so GOOD. He looks like a complete tank, and I can see there being very few people playing as him, but they'll do it very well.
I'd say Toro, honestly. He seems like the guy that nobody ever talks about. Like, I've seen supporters of every other character, and those that aren't all that supported are mentioned all the time as being bad (Dan, FP, etc.), but nobody ever mentions Toro at all.
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I can't think of anyone except Toro, especially online. No one really knows who he is or even cares about him. I mean, there are less popular characters to use online. I can imagine seeing more people use Heihachi than FP or Spike but Toro would be the least seen online.