if I could've made it a four dimensional graph I would have made a "f***ing annoying to fight" scale and a "how good they are online" scale. Twelve, Akuma, Oro, and the Twins would all top the annoying to fight scale, and Elena, Ibuki, Akuma, and Necro would all be higher on the online scale.
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http://www.youtube.com/watch?v=npHDxSvwCE0