Board Thread:Speculation, Theories, and Rumors./@comment-8567094-20131106235508/@comment-24252369-20131211055231

Super Smash Bros. only includes well-know and well-established characters from the games they feature, so that the game references can easily be recognized.

If they were to include a villan from the Sonic series, it would more likely be Eggman, Metal Sonic, or perhaps Shadow (even though he's no longer considered a villan- for now at least)

Now lets say what if, for some reason, he is in a SSB game? Personally, had you said any other member of the Not-So-Deadly Six I would be saying that the game would be ruined. However, Zavok was the only one I considered to at least be somewhat threatening out of them, and the only oe who even appealed to the pother characters as slightly intimidating. So maybe it wouldn't be so bad.