Grom Hellscream from Warcraft Universe.
Overmind from Statcraft Universe.
I don’t know about others.
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Baal, Mengsk, Grom, Overmind, Reinhardt, Blackthorne, and Azshara are all really popular suggestions on the forums and on their twitter/youtube videos.
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Most likely are between Grom from his recent popularity and Mekkatorque/Zoltun Kulle because of how they were actually announced as potential Hots heroes early on.